Business Combinations [Abstract] BUSINESS ACQUISITIONS Business Combination Disclosure [Text Block] Goodwill and Intangible Assets Disclosure [Abstract] Goodwill rollforward Schedule of Goodwill [Table Text Block] Schedule of balance of intangible assets, net Schedule of Intangible Assets and Goodwill [Table Text Block] Schedule of intangible assets with definite lives Schedule of Finite-Lived Intangible Assets [Table Text Block] Schedule of amortization of intangible assets with definite lives for the next five years Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Payables and Accruals [Abstract] Accrued expenses and other current liabilities Accrued Liabilities, Current [Abstract] Accrued advertising expense Accrued Advertising, Current Accrued compensation and benefits Employee-related Liabilities, Current Accrued professional fees Accrued Professional Fees, Current Customer deposits and escrows Customer Deposits, Current Contribution to LendingTree Foundation, Current Charitable Contribution Accrual, Current Charitable Contribution Accrual, Current Operating Lease, Liability, Current Operating Lease, Liability, Current Other Other Liabilities, Current Total accrued expenses and other current liabilities Accrued Liabilities, Current Income Tax Disclosure [Abstract] Reconciliation of unrecognized tax benefits, excluding interest Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] Balance, beginning of the period Unrecognized Tax Benefits Additions based on tax positions of the current period Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions Additions based on tax positions of the prior period Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions Balance, end of the period Unrecognized Tax Benefits Including Interest Unrecognized Tax Benefits Including Interest Represents the amount of unrecognized tax benefits including interest, as of the balance sheet date. Significant change, decrease in unrecognized income tax benefits Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit Accounting Policies [Abstract] Concentration Risk [Table] Concentration Risk [Table] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Revenue from Contract with Customer Benchmark [Member] Revenue from Contract with Customer Benchmark [Member] Concentration Risk Type [Axis] Concentration Risk Type [Axis] Concentration Risk Type [Domain] Concentration Risk Type [Domain] Customer concentration Customer Concentration Risk [Member] Major Customers [Axis] Customer [Axis] Name of Major Customer [Domain] Customer [Domain] Customer one Customer One [Member] Represents details related to customer one. Customer two Customer Two [Member] Represents details related to customer two. Certain Risks and Concentrations Concentration Risk [Line Items] Number of major customers Number of Major Customers Represents the number of major customers of the entity. Concentration risk (as a percent) Concentration Risk, Percentage Leases [Abstract] Summary of Lease Costs Lease, Cost [Table Text Block] Schedule of Supplemental Cash Flow LesseeOperatingLeasesSupplementalCashFlowInformationandNoncashActivityTable [Table Text Block] Lessee operating leases supplemental cash flow information and noncash activity table Schedule of Lease Maturity Lessee, Operating Lease, Liability, Maturity [Table Text Block] Schedule of Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Adjustments for New Accounting Pronouncements [Axis] Adjustments for New Accounting Pronouncements [Axis] Type of Adoption [Domain] Type of Adoption [Domain] Accounting Standards Update 2016-02 [Member] Accounting Standards Update 2016-02 [Member] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Domain] Property, Plant and Equipment, Type [Domain] Building Building and Building Improvements [Member] Site improvements Land Improvements [Member] Computer equipment and capitalized software Computer Equipment and Capitalized Software [Member] Represents the computer equipment and capitalized software held by the entity for its use in production of products and services in which the entity deals, and are subject to depreciation, depletion and amortization. Furniture and other equipment Furniture and Fixtures [Member] Software development Software Development [Member] Aircraft and automobile Automobiles [Member] Statistical Measurement [Axis] Statistical Measurement [Axis] Statistical Measurement [Domain] Statistical Measurement [Domain] Minimum Minimum [Member] Maximum Maximum [Member] Property and Equipment Property, Plant and Equipment [Line Items] Assets Assets Liabilities Liabilities Depreciation period Property, Plant and Equipment, Useful Life Advertising Marketing and Advertising Expense [Abstract] Advertising Expense Advertising Expense Statement of Cash Flows [Abstract] Statement [Table] Statement [Table] Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] ValuePenguin ValuePenguin [Member] ValuePenguin [Member] QuoteWizard QuoteWizard [Member] QuoteWizard [Member] Student Loan Hero Student Loan Hero [Member] Student Loan Hero [Member] Ovation Ovation [Member] Ovation Credit Services SnapCap SnapCap [Member] SnapCap DepositAccounts DepositAccounts [Member] DepositAccounts [Member] MagnifyMoney MagnifyMoney [Member] MagnifyMoney [Member] Statement [Line Items] Statement [Line Items] Cash flows from operating activities attributable to continuing operations: Net Cash Provided by (Used in) Operating Activities, Continuing Operations [Abstract] Net income and comprehensive income Net Income (Loss) Available to Common Stockholders, Basic Less: Loss from discontinued operations, net of tax Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent Net income from continuing operations Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent Adjustments to reconcile income from continuing operations to net cash provided by operating activities attributable to continuing operations: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] (Gain) loss on impairments and disposal of assets Gain (Loss) on Disposition of Property Plant Equipment Amortization of intangibles Amortization of Intangible Assets Depreciation Depreciation, Depletion and Amortization Rental amortization of intangibles and depreciation Other Depreciation and Amortization Non-cash compensation expense Share-based Payment Arrangement, Noncash Expense Deferred income taxes Deferred Income Tax Expense (Benefit) Change in fair value of contingent consideration Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability Bad debt expense Other Noncash Expense Amortization of debt issuance costs Amortization of Debt Issuance Costs Write-off of previously-capitalized debt issuance costs Write off of Deferred Debt Issuance Cost Amortization of convertible debt discount Amortization of Debt Discount (Premium) ROU asset amortization, offset by change in operating lease liabilities ROU asset amortization, offset by change in operating lease liabilities ROU asset amortization, offset by change in operating lease liabilities Changes in current assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Accounts receivable Increase (Decrease) in Accounts Receivable Prepaid and other current assets Increase (Decrease) in Prepaid Expense and Other Assets Accounts payable, accrued expenses and other current liabilities Increase (Decrease) in Accounts Payable and Other Current Liabilities This element represent increase or decrease in accounts payable and other current liabilities Current contingent consideration Contingent Consideration Payment Contingent Consideration Payment Income taxes receivable Increase (Decrease) in Income Taxes Payable, Net of Income Taxes Receivable Other, net Increase (Decrease) in Other Operating Assets and Liabilities, Net Net cash provided by operating activities attributable to continuing operations Net Cash Provided by (Used in) Operating Activities, Continuing Operations Cash flows from investing activities attributable to continuing operations: Net Cash Provided by (Used in) Investing Activities, Continuing Operations [Abstract] Capital expenditures Payments to Acquire Productive Assets Proceeds from the sale of fixed assets Proceeds from Sale of Property, Plant, and Equipment Acquisition of intangible assets Payments to Acquire Intangible Assets Payments to acquire business, net of cash acquired Payments to Acquire Businesses, Net of Cash Acquired Payments to acquire businesses Payments to Acquire Businesses, Gross Net cash used in investing activities attributable to continuing operations Net Cash Provided by (Used in) Investing Activities Cash flows from financing activities attributable to continuing operations: Net Cash Provided by (Used in) Financing Activities, Continuing Operations [Abstract] Payments related to net-share settlement of stock-based compensation, net of proceeds from exercise of stock options Proceeds from (Repurchase of) Equity Contingent consideration payments Payment for Contingent Consideration Liability, Financing Activities Net (repayment of) proceeds from revolving credit facility Proceeds from (Repayments of) Secured Debt Acquisition of noncontrolling interest Payments to Noncontrolling Interests Interest rate Debt Instrument, Interest Rate, Effective Percentage Proceeds from the issuance of 0.625% Convertible Senior Notes Proceeds from Convertible Debt Payment of convertible note hedge transactions Payments for Hedge, Financing Activities Proceeds from the sale of warrants Proceeds from Issuance of Warrants Payment of debt issuance costs Payments of Debt Issuance Costs Purchase of treasury stock Payments for Repurchase of Common Stock Other financing activities Proceeds from (Payments for) Other Financing Activities Net cash (used in) provided by financing activities attributable to continuing operations Net Cash Provided by (Used in) Financing Activities Total cash (used in) provided by continuing operations Net Cash Provided by (Used in) Continuing Operations Discontinued operations: Discontinued Operations and Disposal Groups [Abstract] Net cash used in operating activities attributable to discontinued operations Cash Provided by (Used in) Operating Activities, Discontinued Operations Total cash used in discontinued operations Net Cash Provided by (Used in) Discontinued Operations Net (decrease) increase in cash, cash equivalents, restricted cash, and restricted cash equivalents Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect Cash, cash equivalents, restricted cash, and restricted cash equivalents at beginning of period Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Cash, cash equivalents, restricted cash, and restricted cash equivalents at end of period Supplemental Cash Flow Elements [Abstract] Supplemental Cash Flow Elements [Abstract] Capital additions from tenant improvement allowance Lease Obligation Incurred Supplemental cash flow information: Supplemental Cash Flow Information [Abstract] Interest Interest Paid, Excluding Capitalized Interest, Operating Activities Income tax payments Income Taxes Paid Income tax refunds Proceeds from Income Tax Refunds ASSETS HELD FOR SALE Disposal Groups, Including Discontinued Operations, Disclosure [Text Block] INCOME TAXES Income Tax Disclosure [Text Block] Revenue Recognition Revenue [Policy Text Block] Cash and Cash Equivalents Cash and Cash Equivalents, Policy [Policy Text Block] Restricted Cash Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block] Accounts Receivable Accounts Receivable [Policy Text Block] Segment Reporting Segment Reporting, Policy [Policy Text Block] Property and Equipment Property, Plant and Equipment, Policy [Policy Text Block] Software Development Costs Internal Use Software, Policy [Policy Text Block] Goodwill and Indefinite-Lived Intangible Assets Goodwill and Intangible Assets, Policy [Policy Text Block] Long-Lived Assets and Intangible Assets with Definite Lives Impairment or Disposal of Long-Lived Assets, Including Intangible Assets, Policy [Policy Text Block] Assets and Liabilities Held for Sale Assets And Liabilities Held For Sale [Policy Text Block] Assets And Liabilities Held For Sale [Policy Text Block] Fair Value Measurements Fair Value Measurement, Policy [Policy Text Block] Cost of Revenue Cost of Goods and Service [Policy Text Block] Product Development Research and Development Expense, Policy [Policy Text Block] Advertising Advertising Cost [Policy Text Block] Income Taxes Income Tax, Policy [Policy Text Block] Stock-Based Compensation Share-based Payment Arrangement [Policy Text Block] Litigation Settlements and Contingencies Commitments and Contingencies, Policy [Policy Text Block] Accounting Estimates Use of Estimates, Policy [Policy Text Block] Certain Risks and Concentrations Concentration Risk, Credit Risk, Policy [Policy Text Block] Recent Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Loss Contingencies [Table] Loss Contingencies [Table] Litigation Status [Axis] Litigation Status [Axis] Litigation Status [Domain] Litigation Status [Domain] Pending Litigation [Member] Pending Litigation [Member] Judicial Ruling [Member] Judicial Ruling [Member] Litigation Case [Axis] Litigation Case [Axis] Litigation Case [Domain] Litigation Case [Domain] Residential Funding Co. v Home Loan Center [Member] Residential Funding Co. v Home Loan Center [Member] Residential Funding Co. v Home Loan Center [Member] Lehman Brothers Holdings, Inc. Demand Letter [Member] Lehman Brothers Holdings, Inc. Demand Letter [Member] Lehman Brothers Holdings, Inc. Demand Letter [Member] Residential Funding Company [Domain] Residential Funding Company [Domain] Residential Funding Company [Domain] Investor [Axis] Investor [Axis] Information by investor Investor [Domain] Investor [Domain] [Domain] for Information by investor Loss Contingency Nature [Axis] Loss Contingency Nature [Axis] Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] Loan loss obligations Obligation to Repurchase Receivables Sold [Member] Damages [Member] Damages [Member] Damages [Member] Pre-Verdict Interest [Member] Pre-Verdict Interest [Member] Pre-Verdict Interest [Member] Attorney Fees [Member] Attorney Fees [Member] Attorney Fees [Member] Pre-Judgment Interest [Member] Pre-Judgment Interest [Member] Pre-Judgment Interest [Member] Disposal Group Name [Axis] Disposal Group Name [Axis] Disposal Group Name [Domain] Disposal Group Name [Domain] Lending Tree Loans Lending Tree Loans [Member] Represents the information pertaining to LendingTree Loans. Statement, Operating Activities Segment [Axis] Operating Activities [Axis] Segment, Operating Activities [Domain] Operating Activities [Domain] Discontinued operations Discontinued Operations [Member] Counterparty Name [Axis] Counterparty Name [Axis] Counterparty Name [Domain] Counterparty Name [Domain] Discover Bank Discover Bank [Member] Represents Discover Bank, a wholly owned subsidiary of Discover Financial Services. Loss Contingencies [Line Items] Loss Contingencies [Line Items] Loss Contingency, Number Of Loan Originators Loss Contingency, Number Of Loan Originators Loss Contingency, Number Of Loan Originators Range of possible loss, minimum Loss Contingency, Estimate of Possible Loss Amount of reserve for contingencies Loss Contingency Accrual Loan loss reserve, beginning of period Loan loss reserve, end of period Loss Contingency, Pending Claims, Number Loss Contingency, Pending Claims, Number Loss Contingency, Damages Sought, Value Loss Contingency, Damages Sought, Value Litigation Settlement, Amount Awarded to Other Party Litigation Settlement, Amount Awarded to Other Party Loss Contingency, Number of Defendants Loss Contingency, Number of Defendants Loss Contingencies, Number of Loans Sold with Losses Loss Contingencies, Number of Loans Sold with Losses Represents the number of loans sold with losses by the entity. Schedule of assets acquired and liabilities assumed in a business acquisition Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block] Schedule of definite-lived intangible assets acquired in a business acquisition Schedule of Finite-Lived Intangible Assets Acquired as Part of Business Combination [Table Text Block] Unaudited pro forma revenue and net income from continuing operations of business acquisition Business Acquisition, Pro Forma Information [Table Text Block] Revenue from Contract with Customer [Abstract] Contract Asset Contract with Customer, Asset, after Allowance for Credit Loss Contract Liability Contract with Customer, Liability, Current Revenue recognized from prior period Contract with Customer, Liability, Revenue Recognized Contract with Customer, Liability, Cumulative Catch-up Adjustment to Revenue, Change in Estimate of Transaction Price Contract with Customer, Liability, Cumulative Catch-up Adjustment to Revenue, Change in Estimate of Transaction Price Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Segments [Axis] Segments [Axis] Segments [Domain] Segments [Domain] Home Home Segment [Member] Home Segment [Member] Consumer Consumer Segment [Member] Consumer Segment [Member] Credit Cards Credit Cards [Member] Credit Cards [Member] Personal Loans Personal Loans [Member] Personal Loans [Member] Other Consumer Other Consumer [Member] Other Consumer [Member] Insurance Insurance Segment [Member] Insurance Segment [Member] Product and Service [Axis] Product and Service [Axis] Product and Service [Domain] Product and Service [Domain] Other Products And Services Other Products And Services [Member] Other Products And Services [Member] Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Revenue Revenues Change in Accounting Estimate, Amount Change in Accounting Estimate, Amount Change in Accounting Estimate, Amount Excess tax benefit Proceeds and Excess Tax Benefit from Share-based Compensation Provisional estimate for remeasurement of deferred tax assets and liabilities from Tax Cuts and Jobs Act Provisional estimate for remeasurement of deferred tax assets and liabilities from Tax Cuts and Jobs Act Provisional estimate for remeasurement of deferred tax assets and liabilities from Tax Cuts and Jobs Act New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets GOODWILL AND INTANGIBLE ASSETS Goodwill and Intangible Assets Disclosure [Text Block] SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Table] SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Table] Income Tax Authority [Axis] Income Tax Authority [Axis] Income Tax Authority [Domain] Income Tax Authority [Domain] Federal Internal Revenue Service (IRS) [Member] State State and Local Jurisdiction [Member] SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] Deferred tax assets and deferred tax liabilities Components of Deferred Tax Assets and Liabilities [Abstract] Deferred tax assets: Components of Deferred Tax Assets [Abstract] Provision for accrued expenses Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities Leasing Deferred Tax Assets, Operating Lease Deferred Tax Assets, Operating Lease Net operating loss carryforwards Deferred Tax Assets, Operating Loss Carryforwards Non-cash compensation expense Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost Interest limitation Deferred Tax Asset, Interest Limitation Deferred Tax Asset, Interest Limitation Contingent liabilities Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Contingencies Tax credits Deferred Tax Assets, Tax Credit Carryforwards Other Deferred Tax Assets, Other Total gross deferred tax assets Deferred Tax Assets, Gross Less: valuation allowance (c) Deferred Tax Assets, Valuation Allowance Total deferred tax assets, net of the valuation allowance Gross Deferred Tax Assets, Net of Valuation Allowance Amount AFTER allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. Deferred tax liabilities: Deferred Tax Liabilities, Net [Abstract] Intangible and other assets Deferred Tax Liabilities, Intangible Assets Leasing Deferred Tax Liability, Operating Lease Deferred Tax Liability, Operating Lease Other Deferred Tax Liabilities, Other Total gross deferred tax liabilities Deferred Tax Liabilities, Gross Net deferred taxes Deferred Tax Assets, Net Operating Loss Carryforwards Operating Loss Carryforwards State operating loss carryforwards Deferred Tax Assets, Operating Loss Carryforwards, State and Local Debt Disclosure [Abstract] DEBT Long-term Debt [Text Block] Cash and Cash Equivalents [Abstract] Schedule of cash, restricted cash and cash equivalents Restrictions on Cash and Cash Equivalents [Table Text Block] Property, Plant and Equipment [Abstract] Geographical [Axis] Geographical [Axis] Geographical [Domain] Geographical [Domain] Unamortized capitalized software development costs Capitalized Computer Software, Net Capitalized software development amortization expense Capitalized Computer Software, Amortization Long-lived assets Long-Lived Assets Amortization of intangible assets with definite lives computed on a straight-line basis Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] Year ending December 31, 2020 Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months Year ending December 31, 2021 Finite-Lived Intangible Assets, Amortization Expense, Year Two Year ending December 31, 2022 Finite-Lived Intangible Assets, Amortization Expense, Year Three Year ending December 31, 2023 Finite-Lived Intangible Assets, Amortization Expense, Year Four Year ending December 31, 2024 Finite-Lived Intangible Assets, Amortization Expense, Year Five Thereafter Finite-Lived Intangible Assets, Amortization Expense, after Year Five Net Finite-Lived Intangible Assets, Net Segment Reporting [Abstract] Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Other Other Segments [Member] SEGMENT INFORMATION Segment Reporting Information [Line Items] Number of operating segments Number of Operating Segments Number of reportable segments Number of Reportable Segments Segment cost of revenue and marketing expense Cost of Revenue and Marketing Expense Cost of Revenue and Marketing Expense Segment profit Gross Profit Cost of revenue (exclusive of cost of advertising re-sold to third parties included above) Other Cost of Operating Revenue Brand and other marketing expense Other Selling and Marketing Expense General and administrative expense General and Administrative Expense Product development Research and Development Expense Severance Restructuring Charges Litigation settlements and contingencies Litigation Settlement, Expense Operating income Operating Income (Loss) Interest expense, net Interest Expense Other income (expense) Other Income Income before income taxes Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest Defined Contribution Plan [Abstract] Defined Contribution Plan [Table] Defined Contribution Plan [Table] Vesting [Axis] Vesting [Axis] Vesting [Domain] Vesting [Domain] Service period one Service Period One [Member] Service Period One [Member] Service period two Service Period Two [Member] Service Period Two [Member] Service period three and after Service Period Three and Thereafter [Member] Service Period Three and Thereafter [Member] Defined Contribution Plan Disclosure [Line Items] Defined Contribution Plan Disclosure [Line Items] Maximum contribution by employees as a percentage of pre-tax earnings Defined Contribution Plan Employee Contribution Limit Percentage of Compensation The limit of annual employee contributions to the plan per calendar year as a percentage of compensation. Generally the maximum amount a participant may contribute in accordance with statutory limits Defined Contribution Plan Employee Contributions of Pretax Base Salary Approximate Statutory Limit Generally, the maximum amount an employee may contribute to a defined contribution plan for the calendar year in accordance with statutory limits. Matching contribution per participant dollar contributed Defined Contribution Plan Employer Matching Contribution Per Participant Dollar Contributed Represents maximum amount by the terms of the plan, that the employer may contribute for each dollar to a defined contribution plan. Maximum contribution by employer (as a percent) Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent Employer matching contribution, vested percent Defined Contribution Plan, Employer Matching Contribution, Vested Percent Defined Contribution Plan, Employer Matching Contribution, Vested Percent Requisite service period for matching contribution Defined Contribution Plan Requisite Service Period for Employer Matching Contribution The requisite service period for eligibility for matching contribution by the employer. Matching contribution made by the entity Defined Contribution Plan, Cost Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Convertible Debt Convertible Notes Payable [Member] Debt Instrument [Line Items] Debt Instrument [Line Items] Aggregate principal amount Convertible Debt Conversion rate, number of shares per $1,000 of principal Debt Conversion, Number of Shares of Common Stock Convertible per $1,000 of Principal Notes Debt Conversion, Number of Shares of Common Stock Convertible per $1,000 of Principal Notes Conversion price (in dollars per share) Debt Instrument, Convertible, Conversion Price Threshold percentage of stock price trigger Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger Threshold trading days Debt Instrument, Convertible, Threshold Trading Days Threshold percentage of stock price trigger Debt Instrument, Convertible, Threshold Percentage Of Stock Price Trigger, Five Business Days Debt Instrument, Convertible, Threshold Percentage Of Stock Price Trigger, Five Business Days Redemption percentage Debt Instrument, Redemption Price, Percentage Nonconvertible debt borrowing rate at the date of issuance Nonconvertible Debt Borrowing Rate at the Date of Issuance Nonconvertible Debt Borrowing Rate at the Date of Issuance Convertible debt, noncurrent Convertible Debt, Noncurrent Carrying amount of debt, equity component Debt Instrument, Convertible, Carrying Amount of Equity Component Debt issuance costs, gross Debt Issuance Costs, Gross Debt issuance costs, equity component Debt issuance costs, equity component Debt issuance costs, equity component Interest expense Interest Expense, Debt Interest expense, excluding amortization Interest Expense, Debt, Excluding Amortization Long-term debt, fair value Long-term Debt, Fair Value Debt Issuance Costs, Net [Abstract] Debt Issuance Costs, Net [Abstract] Gross carrying amount Unamortized debt discount Debt Instrument, Unamortized Discount Debt issuance costs Debt issuance costs, liability component Debt issuance costs, liability component Net carrying amount Long-term Debt, Excluding Current Maturities Net proceeds from the convertible notes used to pay for the cost of the convertible note hedge Net proceeds from the Convertible Notes used to pay for the cost of the Convertible Note Hedge Net proceeds from the Convertible Notes used to pay for the cost of the Convertible Note Hedge Payment of convertible note hedge transactions Number of shares covered by the hedge transactions Number of Shares Covered by the Hedge Transactions Number of Shares Covered by the Hedge Transactions Exercise price (in dollars per share) Class of Warrant or Right, Exercise Price of Warrants or Rights Premium of warrant strike price over sales price of common stock Premium of warrant strike price over sales price of common stock Premium of warrant strike price over sales price of common stock Share price (in dollars per share) Share Price Share-based Payment Arrangement [Abstract] Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table] Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table] Income Statement Location [Axis] Income Statement Location [Axis] Income Statement Location [Domain] Income Statement Location [Domain] Cost of revenue Cost of Sales [Member] Selling and marketing expense Selling and Marketing Expense [Member] General and administrative expense General and Administrative Expense [Member] Product development Research and Development Expense [Member] Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] Total non-cash compensation Share-based Payment Arrangement, Expense Document and Entity Information -- None. No documentation exists for this element. -- Document Type Document Type Document Annual Report Document Annual Report Document Period End Date Document Period End Date Document Transition Report Document Transition Report Entity File Number Entity File Number Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Amendment Flag Amendment Flag Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Entity Tax Identification Number Entity Tax Identification Number Entity Address, Address Line One Entity Address, Address Line One Entity Address, City or Town Entity Address, City or Town Entity Address, State or Province Entity Address, State or Province Entity Address, Postal Zip Code Entity Address, Postal Zip Code City Area Code City Area Code Local Phone Number Local Phone Number Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Voluntary Filers Entity Current Reporting Status Entity Current Reporting Status Entity Interactive Data Current Entity Interactive Data Current Entity Filer Category Entity Filer Category Entity Small Business Entity Small Business Entity Emerging Growth Company Entity Emerging Growth Company Entity Shell Company Entity Shell Company Entity Public Float Entity Public Float Dividends Dividends Documents Incorporated by Reference Documents Incorporated by Reference [Text Block] Title of 12(b) Security Title of 12(b) Security Trading Symbol Trading Symbol Security Exchange Name Security Exchange Name Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Components of the income tax provision (benefit) Income Tax Expense (Benefit), Continuing Operations [Abstract] Current income tax expense (benefit): Current Income Tax Expense (Benefit), Continuing Operations [Abstract] Federal Current Federal Tax Expense (Benefit) State Current State and Local Tax Expense (Benefit) Current income tax expense (benefit) Current Income Tax Expense (Benefit) Deferred income tax (benefit) provision: Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract] Federal Deferred Federal Income Tax Expense (Benefit) State Deferred State and Local Income Tax Expense (Benefit) Deferred income tax benefit Income tax (benefit) expense Income Tax Expense (Benefit) Earnings Per Share [Abstract] SHAREHOLDERS' EQUITY Earnings Per Share [Text Block] Related Party Transactions [Abstract] Number Of Board Of Directors Also Serving As Director To Marketing Partner Of The Company Number Of Board Of Directors Also Serving As Director To Marketing Partner Of The Company Number Of Board Of Directors Also Serving As Director To Marketing Partner Of The Company Expenses incurred for related parties Related Party Transaction, Amounts of Transaction Charitable Contribution, Total Charitable Contribution Charitable Contribution SEGMENT INFORMATION Segment Reporting Disclosure [Text Block] Disclosure of long lived assets held-for-sale Disclosure of Long Lived Assets Held-for-sale [Table Text Block] Statement of Financial Position [Abstract] ASSETS: Assets [Abstract] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Restricted cash and cash equivalents Restricted Cash and Cash Equivalents, Current Accounts receivable (net of allowance of $1,466 and $1,143, respectively) Accounts Receivable, after Allowance for Credit Loss, Current Prepaid and other current assets Prepaid Expense and Other Assets, Current Assets held for sale Assets Held-for-sale, Not Part of Disposal Group, Current Current assets of discontinued operations (Note 20) Disposal Group, Including Discontinued Operation, Assets, Current Total current assets Assets, Current Property and equipment (net of accumulated depreciation of $17,979 and $13,887, respectively) Property, Plant and Equipment, Net Goodwill Goodwill Intangible assets, net Intangible Assets, Net (Excluding Goodwill) Deferred income tax assets Deferred Tax Assets, Net, Noncurrent Other non-current assets Other Assets, Noncurrent Non-current assets of discontinued operations (Note 20) Disposal Group, Including Discontinued Operation, Assets, Noncurrent Total assets LIABILITIES: Liabilities [Abstract] Revolving credit facility, outstanding amount Long-term Debt, Current Maturities Accounts payable, trade Accounts Payable, Trade, Current Accrued expenses and other current liabilities Current contingent consideration Business Combination, Contingent Consideration, Liability, Current Current liabilities of discontinued operations (Note 20) Disposal Group, Including Discontinued Operation, Liabilities, Current Total current liabilities Liabilities, Current Long-term debt Non-current contingent consideration Business Combination, Contingent Consideration, Liability, Noncurrent Deferred income tax liabilities Deferred Tax Liabilities, Net, Noncurrent Other non-current liabilities Other Liabilities, Noncurrent Total liabilities Commitments and contingencies (Notes 15 and 16) Commitments and Contingencies SHAREHOLDERS' EQUITY: Stockholders' Equity Attributable to Parent [Abstract] Preferred stock $.01 par value; 5,000,000 shares authorized; none issued or outstanding Preferred Stock, Value, Issued Common stock $.01 par value; 50,000,000 shares authorized; 15,676,819 and 15,428,351 shares issued, respectively, and 13,035,501 and 12,809,764 shares outstanding, respectively Common Stock, Value, Outstanding Additional paid-in capital Additional Paid in Capital, Common Stock Accumulated deficit Retained Earnings (Accumulated Deficit) Treasury stock; 2,641,318 and 2,618,587 shares, respectively Treasury Stock, Value Total shareholders' equity Stockholders' Equity Attributable to Parent Total liabilities and shareholders' equity Liabilities and Equity STOCK-BASED COMPENSATION Share-based Payment Arrangement [Text Block] SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract] SEC Schedule, 12-09, Valuation Allowances and Reserves Type [Axis] SEC Schedule, 12-09, Valuation Allowances and Reserves Type [Axis] SEC Schedule, 12-09, Valuation Allowances and Reserves [Domain] SEC Schedule, 12-09, Valuation Allowances and Reserves [Domain] Change in valuation and qualifying accounts SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] Accounts receivable, allowance Accounts Receivable, Allowance for Credit Loss, Current Accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Preferred stock, par value (in dollars per share) Preferred Stock, Par or Stated Value Per Share Preferred stock, authorized shares Preferred Stock, Shares Authorized Preferred stock, issued shares Preferred Stock, Shares Issued Preferred stock, outstanding shares Preferred Stock, Shares Outstanding Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Common stock, authorized shares Common Stock, Shares Authorized Common Stock, Shares, Issued Common Stock, Shares, Issued Shares, Issued Shares, Issued Common stock, outstanding shares Common Stock, Shares, Outstanding Treasury Stock, Shares Treasury Stock, Shares Accounts Receivable, Allowance for Credit Loss [Roll Forward] Accounts Receivable, Allowance for Credit Loss [Roll Forward] Balance, beginning of the period Accounts Receivable, Allowance for Credit Loss Charges to earnings Accounts Receivable, Credit Loss Expense (Reversal) Write off of uncollectible accounts receivable Accounts Receivable, Allowance for Credit Loss, Writeoff Balance, end of the period Schedule of Debt Schedule of Debt [Table Text Block] Fair Value Disclosures [Abstract] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Contingent consideration on acquisition date Business Combination, Contingent Consideration, Liability Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Beginning balance Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value Contingent consideration additions Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases, (Sales), Issuances, (Settlements) Contingent consideration payments Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements Ending balance Commitments and Contingencies Disclosure [Abstract] COMMITMENTS Commitments Disclosure [Text Block] Schedule of Segment Reporting Information, by Segment Schedule of Segment Reporting Information, by Segment [Table Text Block] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Award Type [Axis] Award Type [Axis] Award Type [Domain] Award Type [Domain] Performance-Based Restricted Stock Performance-Based Restricted Stock [Member] Performance-Based Restricted Stock [Member] Time-Vested Performance Shares [Member] Time-Vested Performance Shares [Member] Time-Vested Performance Shares [Member] Plan Name [Axis] Plan Name [Axis] Plan Name [Domain] Plan Name [Domain] Equity Award Plan Equity Award Plan [Member] Equity Award Plan [Member] Inducement Plan Inducement Plan [Member] Inducement Plan [Member] STOCK-BASED COMPENSATION Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Number of active plans Share Based Compensation Arrangement by Share Based Payment Award, Number of Active Plans Represents the number of active plans under which future awards may be granted. Number of shares authorized Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Term of plan Share Based Compensation Arrangements by Share Based Payment Award, Options Expiration Term The period of time, from the grant date until the time at which the share-based [option] award expires. Income tax benefit related to non-cash compensation Share-based Payment Arrangement, Expense, Tax Benefit Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period Quarterly Financial Information [Abstract] Quarterly Financial Information [Abstract] Schedule of quarterly financial information Quarterly Financial Information [Table Text Block] Two Office Buildings In Charlotte, NC Two Office Buildings In Charlotte, NC [Member] Two Office Buildings In Charlotte, NC [Member] Weighted Average Weighted Average [Member] Property, Plant and Equipment [Line Items] Number Of Office Buildings Acquired Number Of Office Buildings Acquired Number Of Office Buildings Acquired Weighted Average Amortization Life Acquired Finite-lived Intangible Assets, Weighted Average Useful Life Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment Acquisition Costs, Period Cost Acquisition Costs, Period Cost Performance Options Performance Options [Member] Performance Options Stock Options, One Share-based Payment Arrangement, Option [Member] Stock Options, Two Employee Stock Option 2 [Member] Employee Stock Option 2 [Member] one year from the grant date Tranche 2 [Member] Tranche 2 [Member] two years from the grant date Tranche 3 [Member] Tranche 3 [Member] three years from the grant date Tranche 6 [Member] Tranche 6 [Member] five and a half years Tranche 7 [Member] Tranche 7 [Member] Performance measurement period ending September 30, 2022 Share-based Payment Arrangement, Tranche One [Member] Performance measurement period ending March 31, 2022 Share-based Payment Arrangement, Tranche Two [Member] Unrecognized compensation cost Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Weighted-average period for recognition of unrecognized compensation cost Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Intrinsic value of stock options exercised Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value Proceeds from Stock Options Exercised Proceeds from Stock Options Exercised Share-based Payment Arrangement, Exercise of Option, Tax Benefit Share-based Payment Arrangement, Exercise of Option, Tax Benefit Weighted average fair value (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value Vesting period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Vesting percentage Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage Performance Awards Earned Performance Awards Earned Performance Awards Earned Fair Value of Options Vested Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value Return performance, percent of target stock price Share-Based Compensation Arrangement By Share-Based Payment Award, Percentage Of Target Number Of Shares Share-Based Compensation Arrangement By Share-Based Payment Award, Percentage Of Target Number Of Shares Maximum number of shares for earned (in shares) Share-Based Compensation Arrangement By Share-Based Payment Award, Maximum Shares To Be Earned Share-Based Compensation Arrangement By Share-Based Payment Award, Maximum Shares To Be Earned Schedule of Guarantor Obligations [Table] Schedule of Guarantor Obligations [Table] Balance Sheet Location [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Discontinued Operations, Disposed of by Sale [Member] Discontinued Operations, Disposed of by Sale [Member] Guarantor Obligations, Nature [Axis] Guarantor Obligations, Nature [Axis] Guarantor Obligations, Nature [Domain] Guarantor Obligations, Nature [Domain] Surety bond Surety Bond [Member] Commitment Guarantor Obligations [Line Items] Total Amounts Committed Guarantor Obligations, Maximum Exposure, Undiscounted Less Than 1 year Commitment Expiration Related to Performance and Completion of Contracts within One Year Represents the amount of commitment expiration in the first year after the balance sheet date related to performance and completion of contracts. 1-3 years Commitment Expiration Related to Performance and Completion of Contracts Due within Second and Third Year Represents the amount of commitment expiration within the second and third year after the balance sheet date related to performance and completion of contracts. 3-5 years Commitment Expiration Related to Performance and Completion of Contract Due within Three and Fifth Year Represents the amount of commitment expiration within the three and fifth year after the balance sheet date related to performance and completion of contracts. More Than 5 years Commitment Expiration Related to Performance and Completion of Contract Due after Fifth Year Represents the amount of commitment expiration after the fifth year of the balance sheet date related to performance and completion of contracts. Schedule of property and equipment, net Schedule of Property, Plant and Equipment Components [Table Text Block] Tabular disclosure of the components of property, plant and equipment. Schedule of components of the income tax provision (benefit) Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Schedule of reconciliation of total income tax provision to amounts computed by applying statutory federal income tax rate to income (loss) from continuing operations before income taxes Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Schedule of components of the deferred tax assets and deferred tax liabilities Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Schedule of the deferred tax valuation allowance reconciliation Summary of Valuation Allowance [Table Text Block] Schedule of reconciliation of beginning and ending amounts of unrecognized tax benefits, excluding interest and penalties Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block] Schedule of reconciliation of the allowance for doubtful accounts Financing Receivable, Allowance for Credit Loss [Table Text Block] Schedule of depreciation period for each asset category Property, Plant and Equipment [Table Text Block] Schedule of effect of new accounting pronouncements Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block] REVENUE Revenue from Contract with Customer [Text Block] Schedule of changes in assets and liabilities that are measured at fair value on a recurring basis using significant unobservable inputs Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Table] Disposal Groups, Including Discontinued Operations [Table] Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] Home Loan Center, Inc. [Member] Home Loan Center, Inc. [Member] Home Loan Center, Inc. [Member] Disposal Group Classification [Axis] Disposal Group Classification [Axis] Disposal Group Classification [Domain] Disposal Group Classification [Domain] Discontinued Operations, Disposed of by Means Other than Sale [Member] Discontinued Operations, Disposed of by Means Other than Sale [Member] DISCONTINUED OPERATIONS Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Schedule of revenue and net income of the discontinued operations Schedule of Disposal Groups Including Discontinued Operations, Income Statement [Table Text Block] Tabular disclosure of disposal groups, which may include the gain (loss) recognized in the income statement and the income statement caption that includes that gain (loss), amounts of revenues and pretax profit or loss reported in discontinued operations Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest Asset Purchase Agreement Proceeds From Sale Asset Purchase Agreement Proceeds From Sale Represents the proceeds for sale of the assets under the purchase agreement entered into by the reporting entity. Revenue and net income (loss) of discontinued operations Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract] Revenue Disposal Group, Including Discontinued Operation, Revenue Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax Income tax benefit Discontinued Operation, Tax Effect of Discontinued Operation Loss from discontinued operations Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, Net of Tax Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, Net of Tax Cash Cash Loss Contingency, Estimate of Possible Loss Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Subsequent Event [Member] Subsequent Event [Member] RSUs Restricted Stock Units (RSUs) [Member] Credit Facility [Axis] Credit Facility [Axis] Credit Facility [Domain] Credit Facility [Domain] Revolving Credit Facility Revolving Credit Facility [Member] Title of Individual [Axis] Title of Individual [Axis] Title of Individual [Domain] Title of Individual [Domain] Two Key Employees Two Key Employees [Member] Two Key Employees [Member] Third Key Employee Third Key Employee [Member] Third Key Employee [Member] Contingent Consideration by Type [Axis] Contingent Consideration by Type [Axis] Contingent Consideration Type [Domain] Contingent Consideration Type [Domain] Earnout Payment Earnout Payment for One Contingent Earnout [Member] Earnout Payment for One Contingent Earnout [Member] Business Acquisition [Line Items] Business Acquisition [Line Items] Acquisition purchase consideration Proceeds from revolving credit facility Proceeds from Long-term Lines of Credit Total purchase price Business Combination, Consideration Transferred Working capital adjustment Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Working Capital Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Working Capital Revenue of acquirees since acquisition date Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual Earnings of acquiree since acquisition date Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual Acquisition related costs Business Combination, Acquisition Related Costs Cash on hand Business Combination, Consideration Transferred, Cash On Hand Business Combination, Consideration Transferred, Cash On Hand Number of payments Business Combination, Number Of Payments Business Combination, Number Of Payments Contingent consideration range, minimum Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, Low Contingent consideration range, maximum Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High Current contingent consideration Contingent consideration payments Contingent consideration payment, operating Payment for Contingent Consideration Liability, Operating Activities Contingent consideration arrangements, after tax contingent consideration expense Business Combination, Contingent Consideration Arrangements, After Tax Contingent Consideration Expense After tax contingent consideration expense. Severance costs Severance Costs Number of contingent consideration payments Number Of Contingent Consideration Payments Number Of Contingent Consideration Payments Option to acquire a foreign affiliate Option to Acquire a Foreign Affiliate Option to Acquire a Foreign Affiliate Option to acquire a foreign affiliate, window Option To Acquire A Foreign Affiliate, Window Option To Acquire A Foreign Affiliate, Window Stock granted, net of forfeitures Shares Granted, Value, Share-based Payment Arrangement, after Forfeiture Contingent consideration, individual payments based on specified increases in federal funds interest rates Business Combination, Contingent Consideration, Individual Payments Based on Specified Increases in Federal Funds Interest Rates Business Combination, Contingent Consideration, Individual Payments Based on Specified Increases in Federal Funds Interest Rates Contingent consideration, one-time performance payment Business Combination, Contingent Consideration, One-Time Performance Payment Business Combination, Contingent Consideration, One-Time Performance Payment Business Acquisition, Pro Forma Information, Nonrecurring Adjustments [Table] Business Acquisition, Pro Forma Information, Nonrecurring Adjustments [Table] Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] Pro forma revenue Business Acquisition, Pro Forma Revenue Pro forma net income from continuing operations Business Acquisition, Pro Forma Income (Loss) from Continuing Operations, Net of Tax Operating Loss Carryforwards, Valuation Allowance Operating Loss Carryforwards, Valuation Allowance Valuation Allowance [Abstract] Valuation Allowance [Abstract] Balance, beginning of the period Change in valuation allowance Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount Balance, end of the period Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Technology Technology-Based Intangible Assets [Member] Customer lists Customer Lists [Member] Website content Media Content [Member] Trademarks and trade names Trademarks and Trade Names [Member] Fair Value Finite-lived Intangible Assets Acquired Intangible assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles SIGNIFICANT ACCOUNTING POLICIES Significant Accounting Policies [Text Block] Financial Information of Disc Ops [Abstract] Financial Information of Disc Ops [Abstract] Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Revenue Disposal Group, Including Discontinued Operation, Other Expense Disposal Group, Including Discontinued Operation, Other Expense Loss from discontinued operations, net of tax Lessee, Lease, Description [Table] Lessee, Lease, Description [Table] Lessee, Lease, Description [Line Items] Lessee, Lease, Description [Line Items] Operating Leases, Rent Expense, Minimum Rentals Operating Leases, Rent Expense, Minimum Rentals Operating Lease, Lease Income Operating Lease, Lease Income Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months Lessee, Operating Lease, Liability, Payments, Due Year Two Lessee, Operating Lease, Liability, Payments, Due Year Two Operating Lease, Payments Operating Lease, Payments Operating Lease, Weighted Average Remaining Lease Term Operating Lease, Weighted Average Remaining Lease Term Operating Lease, Cost Operating Lease, Cost Lessee, Operating Lease, Number Of Renewal Options Lessee, Operating Lease, Number Of Renewal Options Lessee, Operating Lease, Number Of Renewal Options Lessee, Operating Lease, Renewal Term Lessee, Operating Lease, Renewal Term Operating Lease, Right-of-Use Asset Operating Lease, Right-of-Use Asset Operating Lease, Liability Operating Lease, Liability Short-term Lease, Cost Short-term Lease, Cost Lease, Cost Lease, Cost Operating Lease, Weighted Average Discount Rate, Percent Operating Lease, Weighted Average Discount Rate, Percent Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Lessee, Operating Lease, Liability, Payments, Due Year Three Lessee, Operating Lease, Liability, Payments, Due Year Three Lessee, Operating Lease, Liability, Payments, Due Year Four Lessee, Operating Lease, Liability, Payments, Due Year Four Lessee, Operating Lease, Liability, Payments, Due Year Five Lessee, Operating Lease, Liability, Payments, Due Year Five Lessee, Operating Lease, Liability, Payments, Due after Year Five Lessee, Operating Lease, Liability, Payments, Due after Year Five Lessee, Operating Lease, Liability, Payments, Due Lessee, Operating Lease, Liability, Payments, Due Lessee, Operating Lease, Liability, Undiscounted Excess Amount Lessee, Operating Lease, Liability, Undiscounted Excess Amount Schedule of Finite-Lived Intangible Assets [Table] Schedule of Finite-Lived Intangible Assets [Table] Tenant leases Leases, Acquired-in-Place [Member] Other Other Intangible Assets [Member] Intangible assets with definite lives Finite-Lived Intangible Assets [Line Items] Total intangible assets with definite lives, net Acquired Finite-lived Intangible Assets, Weighted Average Useful Life Weighted Average Amortization Life Finite-Lived Intangible Asset, Useful Life Cost Finite-Lived Intangible Assets, Gross Accumulated Amortization Finite-Lived Intangible Assets, Accumulated Amortization LendingTree Loans [Abstract] LendingTree Loans [Abstract] Assets Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] Operating income (loss) Income (loss) from continuing operations Loss from discontinued operations Net income (loss) and comprehensive income (loss) Basic (in dollars per share) Income (Loss) from Continuing Operations, Per Basic Share Diluted (in dollars per share) Income (Loss) from Continuing Operations, Per Diluted Share Income (loss) per share from discontinued operations: Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic and Diluted Share [Abstract] Basic (in dollars per share) Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Basic Share Diluted (in dollars per share) Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Diluted Share Income per share from continuing operations: Earnings Per Share, Basic and Diluted [Abstract] Basic (in dollars per share) Earnings Per Share, Basic Diluted (in dollars per share) Earnings Per Share, Diluted Restrictions on Cash and Cash Equivalents [Table] Restrictions on Cash and Cash Equivalents [Table] Restricted Cash and Cash Equivalents Items [Line Items] Restricted Cash and Cash Equivalents Items [Line Items] Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents FAIR VALUE MEASUREMENT Fair Value Disclosures [Text Block] DISCONTINUED OPERATIONS LEASES Lessor, Operating Leases [Text Block] LEASES Lessee, Operating Leases [Text Block] Line of Credit Facility [Table] Line of Credit Facility [Table] 31 Day Borrowing, first Revolving Credit Facility, 31 Day Borrowing [Member] Revolving Credit Facility, 31 Day Borrowing [Member] 31 Day Borrowing, second Revolving Credit Facility, 31 Day Borrowing, Two [Member] Revolving Credit Facility, 31 Day Borrowing, Two [Member] Variable Rate [Axis] Variable Rate [Axis] Variable Rate [Domain] Variable Rate [Domain] Fed Funds Effective Rate Overnight Index Swap Rate Fed Funds Effective Rate Overnight Index Swap Rate [Member] ABR Base Rate [Member] LIBOR London Interbank Offered Rate (LIBOR) [Member] Swingline Facility Swingline Facility [Member] Swingline Facility [Member] Letter of Credit Letter of Credit [Member] Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] Maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Revolving credit facility, term Debt Instrument, Term Interest rate Long-term Debt, Weighted Average Interest Rate, at Point in Time Credit Agreement, potential additional borrowing capacity Credit Agreement, Potential Additional Borrowing Capacity Credit Agreement, Potential Additional Borrowing Capacity Credit Agreement, ratio of debt to EBITDA Credit Agreement, Ratio of Debt to EBITDA Credit Agreement, Ratio of Debt to EBITDA Letters of credit outstanding Letters of Credit Outstanding, Amount Revolving credit facility, basis spread on variable rate Debt Instrument, Basis Spread on Variable Rate Ratio of debt to EBITDA Ratio of Debt to EBITDA Ratio of Debt to EBITDA Ratio of debt to EBITDA step-down Ratio of Debt to EBITDA Step-Down Ratio of Debt to EBITDA Step-Down Ratio of debt to EBITDA Increase Ratio of Debt to EBITDA Increase Ratio of Debt to EBITDA Increase Percent of domestic subsidiaries equity Line of Credit Facility, Collateral, Percent of Domestic Subsidiaries Equity Line of Credit Facility, Collateral, Percent of Domestic Subsidiaries Equity Percent of voting equity Line of Credit Facility, Collateral, Percent of Voting Equity Line of Credit Facility, Collateral, Percent of Voting Equity Percent of non-voting equity Line of Credit Facility, Collateral, Percent of Non-Voting Equity Line of Credit Facility, Collateral, Percent of Non-Voting Equity Revolving credit facility, collateral, percent of assets Line of Credit Facility, Collateral, Percent of Assets Line of Credit Facility, Collateral, Percent of Assets Revolving credit facility, collateral, percent of equity Line of Credit Facility, Collateral, Percent of Equity Line of Credit Facility, Collateral, Percent of Equity Revolving credit facility, unused capacity, commitment fee percentage Line of Credit Facility, Unused Capacity, Commitment Fee Percentage Revolving credit facility, letter of credit participation fee percentage Line of Credit Facility, Letter of Credit Participation Fee Percentage Line of Credit Facility, Participation Fee Revolving credit facility, letter of credit fronting fee percentage Line of Credit Facility, Letter of Credit Fronting Fee Percentage Line of Credit Facility, Letter of Credit Fronting Fee Percentage Revolving credit facility, debt issuance costs Debt Instrument, Fee Amount Unused borrowing capacity fee Debt Instrument, Unused Borrowing Capacity, Fee Schedule of accrued expenses and other current liabilities Schedule of Accrued Liabilities [Table Text Block] Other Commitments [Table] Other Commitments [Table] Other Commitments [Line Items] Other Commitments [Line Items] Other Commitment Other Commitment Non-current assets of discontinued operations Deferred Tax Asset, Parent's Basis in Discontinued Operation Deferred income tax liabilities ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES Accounts Payable, Accrued Liabilities, and Other Liabilities Disclosure, Current [Text Block] Schedule of funding commitments that could potentially require performance in the event of demands by third parties or contingent events Commitments Related to Performance on Demand [Table Text Block] Tabular disclosure of commitments that could potentially require performance in the event of demands by third parties or contingent events. Schedule of Goodwill [Table] Schedule of Goodwill [Table] Goodwill [Line Items] Goodwill [Line Items] Increase to goodwill due to acquisitions Goodwill, Period Increase (Decrease) Impairment losses during period related to goodwill Goodwill, Impairment Loss Balance of goodwill and intangible assets, net Intangible Assets, Net (Including Goodwill) [Abstract] Goodwill Goodwill, Gross Accumulated impairment losses Goodwill, Impaired, Accumulated Impairment Loss Net goodwill Intangible assets with indefinite lives Indefinite-lived Intangible Assets (Excluding Goodwill) Intangible assets with definite lives, net Total intangible assets, net Impairment charges related to trade names and trademarks Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) Schedule of Long Lived Assets Held-for-sale [Table] Schedule of Long Lived Assets Held-for-sale [Table] Land Land [Member] Long Lived Assets Held-for-sale [Line Items] Long Lived Assets Held-for-sale [Line Items] Number Of Buildings Held For Sale Number Of Buildings Held For Sale Number Of Buildings Held For Sale Assets Held-For-Sale, Not Part Of Disposal Group, Property, Plant, And Equipment, Gross Assets Held-For-Sale, Not Part Of Disposal Group, Property, Plant, And Equipment, Gross Assets Held-For-Sale, Not Part Of Disposal Group, Property, Plant, And Equipment, Gross Assets Held-For-Sale, Not Part Of Disposal Group, Property, Plant, And Equipment, Accumulated Depreciation, Depletion And Amortization Assets Held-For-Sale, Not Part Of Disposal Group, Property, Plant, And Equipment, Accumulated Depreciation, Depletion And Amortization Assets Held-For-Sale, Not Part Of Disposal Group, Property, Plant, And Equipment, Accumulated Depreciation, Depletion And Amortization Assets Held-For-Sale, Not Part Of Disposal Group, Property, Plant, And Equipment, Net Assets Held-For-Sale, Not Part Of Disposal Group, Property, Plant, And Equipment, Net Assets Held-For-Sale, Not Part Of Disposal Group, Property, Plant, And Equipment, Net Assets Held-For-Sale, Not Part Of Disposal Group, Finite-Lived Intangible Assets, Gross Assets Held-For-Sale, Not Part Of Disposal Group, Finite-Lived Intangible Assets, Gross Assets Held-For-Sale, Not Part Of Disposal Group, Finite-Lived Intangible Assets, Gross Assets Held-For-Sale, Not Part Of Disposal Group, Finite-Lived Intangible Assets, Net Assets Held-For-Sale, Not Part Of Disposal Group, Finite-Lived Intangible Assets, Net Assets Held-For-Sale, Not Part Of Disposal Group, Finite-Lived Intangible Assets, Net Disposal Group, Including Discontinued Operation, Consideration Disposal Group, Including Discontinued Operation, Consideration Disposal Group, Including Discontinued Operation, Closing Fee Disposal Group, Including Discontinued Operation, Closing Fee Disposal Group, Including Discontinued Operation, Closing Fee Antidilutive Securities [Axis] Antidilutive Securities [Axis] Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Common Stock Common Stock [Member] Calculation of Weighted Average Common Shares Weighted Average Number of Shares Outstanding Reconciliation [Abstract] Weighted average shares outstanding: Incremental Weighted Average Shares Attributable to Dilutive Effect [Abstract] Weighted average basic common shares (in shares) Weighted Average Number of Shares Outstanding, Basic Effect of stock options (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements Effect of dilutive share awards (in shares) IncrementalCommonSharesAttributableToRestrictedStockUnits IncrementalCommonSharesAttributableToRestrictedStockUnits Effect of Convertible Senior Notes and warrants Incremental Common Shares Attributable to Dilutive Effect of Call Options and Warrants Weighted average diluted common shares (in shares) Weighted Average Number of Shares Outstanding, Diluted Additional disclosure Earnings Per Share, Diluted, Other Disclosures [Abstract] Anti-dilutive securities excluded from calculation of diluted earnings per share Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Common Stock Repurchases Disclosure of Repurchase Agreements [Abstract] Value of common stock authorized to be repurchased Stock Repurchase Program, Authorized Amount Purchase of treasury stock (in shares) Treasury Stock, Shares, Acquired Value of treasury stock acquired Treasury Stock, Value, Acquired, Cost Method Remaining authorized repurchase amount Stock Repurchase Program, Remaining Authorized Repurchase Amount Property, Plant and Equipment [Table] Leasehold improvements Leasehold Improvements [Member] Projects in progress Construction in Progress [Member] Total gross property and equipment Property, Plant and Equipment, Gross Accumulated depreciation Total property and equipment, net Revenue, Initial Application Period Cumulative Effect Transition [Table] Revenue, Initial Application Period Cumulative Effect Transition [Table] Initial Application Period Cumulative Effect Transition [Axis] Initial Application Period Cumulative Effect Transition [Axis] Initial Application Period Cumulative Effect Transition [Domain] Initial Application Period Cumulative Effect Transition [Domain] Balances without adoption of ASC Topic 606 Calculated under Revenue Guidance in Effect before Topic 606 [Member] Adjustments due to ASC Topic 606 Difference between Revenue Guidance in Effect before and after Topic 606 [Member] Accounting Standards Update 2014-09 Accounting Standards Update 2014-09 [Member] Revenue, Initial Application Period Cumulative Effect Transition [Line Items] Revenue, Initial Application Period Cumulative Effect Transition [Line Items] Share-based Payment Arrangement Share-based Payment Arrangement [Member] Number of Options Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Outstanding at the beginning of the period (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Exercised (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Forfeited (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period Expired (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period Outstanding at the end of the period (in shares) Options exercisable at the end of the period (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number Weighted Average Exercise Price Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Outstanding at the beginning of the period (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Granted (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Exercised (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Forfeited (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price Expired (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price Outstanding at the end of the period (in dollars per share) Options exercisable at the end of the period (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price Weighted Average Remaining Contractual Term Share Based Compensation Arrangement by Share Based Payment Award, Options, Weighted Average Remaining Contractual Term [Abstract] -- None. No documentation exists for this element. -- Outstanding at the end of the period Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Options exercisable at the end of the period Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term Aggregate Intrinsic Value Share Based Compensation Arrangement by Share Based Payment Award, Options, Aggregate Intrinsic Value [Abstract] -- None. No documentation exists for this element. -- Outstanding at the end of the period Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value Options exercisable at the end of the period Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value Divdends Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Payments Weighted average assumptions Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract] Expected Term Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Dividend yield Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate Expected Volatility Rate, Minimum Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Minimum Expected Volatility Rate, Maximum Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Maximum Risk Free Interest Rate, Minimum Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Minimum Risk Free Interest Rate, Maximum Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Maximum Organization, Consolidation and Presentation of Financial Statements [Abstract] ORGANIZATION Business Description and Basis of Presentation [Text Block] Income Statement [Abstract] Costs and expenses: Costs and Expenses [Abstract] Cost of revenue (exclusive of depreciation and amortization shown separately below) Cost of Revenue Selling and marketing expense Selling and Marketing Expense Total costs and expenses Costs and Expenses Other (expense) income, net: Other Nonoperating Income (Expense) [Abstract] Income tax benefit (expense) Net income Weighted average diluted common shares (in shares) Loss per share from discontinued operations: Income (Loss) from Discontinued Operations, Net of Tax, Per Basic and Diluted Share [Abstract] -- None. No documentation exists for this element. -- Basic (in dollars per share) Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share Diluted (in dollars per share) Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share Net income per share: Operating Loss Carryforwards [Table] Operating Loss Carryforwards [Table] Income Tax Authority, Name [Axis] Income Tax Authority, Name [Axis] Income Tax Authority, Name [Domain] Income Tax Authority, Name [Domain] Tax Period [Axis] Tax Period [Axis] Tax Period [Domain] Tax Period [Domain] Operating Loss Carryforwards [Line Items] Operating Loss Carryforwards [Line Items] Reconciliation of income tax provision to amounts computed by statutory federal income tax rate to income (loss) from continuing operations before income taxes Effective Income Tax Rate Reconciliation, Amount [Abstract] Federal statutory income tax Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount State income taxes, net Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount Excess tax deductions on non-cash compensation Proceeds And Excess Tax Benefit From Share based Compensation, Federal Proceeds And Excess Tax Benefit From Share based Compensation, Federal Research and experimentation tax credit Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount Impact of certain state legislation, net Effective Income Tax Rate Reconciliation, Tax Settlement, State and Local, Amount Nondeductible executive compensation Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Payment Arrangement, Amount Change in (release of) valuation allowance Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount Uncertain tax positions Effective Income Tax Rate Reconciliation, Uncertain Tax Positions, Amount Effective Income Tax Rate Reconciliation, Uncertain Tax Positions, Amount Nondeductible meals & entertainment Effective Income Tax Rate Reconciliation, Nondeductible Expense, Meals and Entertainment, Amount Impact of Tax Cuts and Jobs Act Effective Income Tax Rate Reconciliation, Tax Cuts and Jobs Act, Amount Other, net Effective Income Tax Rate Reconciliation, Other Adjustments, Amount Federal Statutory Income Tax Rate (as a percent) Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Schedule of computation of basic and diluted earnings per share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] CONTINGENCIES Legal Matters and Contingencies [Text Block] CASH AND RESTRICTED CASH Restricted Assets Disclosure [Text Block] PROPERTY AND EQUIPMENT Property, Plant and Equipment Disclosure [Text Block] Market-Based Restricted Stock Market-Based Restricted Stock [Member] Market-Based Restricted Stock Performance Shares Performance Shares [Member] Nonvested RSUs and RSAs, Number of Shares Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Nonvested at the beginning of the period (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Vested (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Forfeited (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Nonvested at the end of the period (in shares) Nonvested RSUs and RSAs, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract] Nonvested at the beginning of the period (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Granted (in dollars per share) Vested (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Forfeited (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Nonvested at the end of the period (in dollars per share) Vested fair value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value Schedule of non-cash compensation expense related to equity awards Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] Summary of changes in outstanding stock options Share-based Payment Arrangement, Option, Activity [Table Text Block] Summary of stock option valuation assumptions Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Schedule of changes in outstanding non-vested RSUs, restricted stock and RSUs with performance conditions Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block] BENEFIT PLANS Pension and Other Postretirement Benefits Disclosure [Text Block] Contingencies Accrued litigation liabilities Estimated Litigation Liability Net working capital and other assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Working Capital Amount recognized as of the acquisition date for the identifiable current assets acquired in excess of (less than) the aggregate current liabilities assumed. Fixed assets Other noncurrent assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets Deferred tax liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Noncurrent Noncontrolling interest Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value QUARTERLY FINANCIAL INFORMATION (UNAUDITED) Quarterly Financial Information [Text Block] RELATED PARTY TRANSACTIONS Related Party Transactions Disclosure [Text Block] Statement of Stockholders' Equity [Abstract] Accounting Standards Update 2016-09 Accounting Standards Update 2016-09 [Member] Comprehensive Income Comprehensive Income [Member] Additional Paid-in Capital Additional Paid-in Capital [Member] Accumulated Deficit Retained Earnings [Member] Treasury Stock Treasury Stock [Member] Noncontrolling Interest Noncontrolling Interest [Member] Increase (Decrease) in Stockholders' Equity Increase (Decrease) in Stockholders' Equity [Roll Forward] Balance Balance (in shares) Non-cash compensation APIC, Share-based Payment Arrangement, Increase for Cost Recognition Purchase of treasury stock Issuance of common stock for stock options, restricted stock awards and restricted stock units, net of withholding taxes Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture Issuance of common stock for stock options, restricted stock awards and restricted stock units, net of withholding taxes (in shares) Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture Noncontrolling Interest Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net Cumulative effect adjustment New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests Stockholders' Equity, Other Stockholders' Equity, Other Issuance of 0.625% Convertible Senior Notes, net Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt Convertible note hedge Adjustments to Additional Paid in Capital, Entry into Convertible Note Hedge Transactions Adjustments to Additional Paid in Capital, Entry into Convertible Note Hedge Transactions Sale of warrants Adjustments to Additional Paid in Capital, Warrant Issued Balance Balance (in shares)