Earnings Per Share [Abstract] SHAREHOLDERS' EQUITY Earnings Per Share [Text Block] Accounting Policies [Abstract] New Accounting Pronouncements or Change in Accounting Principle [Table] New Accounting Pronouncements or Change in Accounting Principle [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 Accounting Standards Update 2016-02 [Member] New Accounting Pronouncements or Change in Accounting Principle [Line Items] New Accounting Pronouncements or Change in Accounting Principle [Line Items] Assets Assets Liabilities Liabilities 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] Debt Disclosure [Abstract] Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Variable Rate [Axis] Variable Rate [Axis] Variable Rate [Domain] Variable Rate [Domain] Debt Instrument, Redemption, Period [Axis] Debt Instrument, Redemption, Period [Axis] Debt Instrument, Redemption, Period [Domain] Debt Instrument, Redemption, Period [Domain] Statistical Measurement [Axis] Statistical Measurement [Axis] Statistical Measurement [Domain] Statistical Measurement [Domain] Debt Instrument [Line Items] Debt Instrument [Line Items] 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 Payments for Hedge, Financing Activities Number of shares covered by the hedge transactions Number of Shares Covered by the Hedge Transactions Number of Shares Covered by the Hedge Transactions Initial conversion price per share Debt Instrument, Convertible, Conversion Price Strike price of warrants sold 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 Share Price Proceeds from the sale of warrants Proceeds from Issuance of Warrants Segment Reporting [Abstract] Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Product and Service [Axis] Product and Service [Axis] Product and Service [Domain] Product and Service [Domain] Mortgage products Mortgage Products [Member] Mortgage Products [Member] Non-mortgage products Non-mortgage Products [Member] Non-mortgage Products [Member] Segment Information Segment Reporting Information [Line Items] Number of reportable segments Number of Reportable Segments Revenue Revenues Business Combinations [Abstract] Business Acquisition, Pro Forma Information, Nonrecurring Adjustments [Table] Business Acquisition, Pro Forma Information, Nonrecurring Adjustments [Table] Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] QuoteWizard QuoteWizard [Member] QuoteWizard [Member] 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 After tax contingent consideration tax Business Combination, Contingent Consideration Arrangements, After Tax Contingent Consideration Expense After tax contingent consideration expense. Acquisition related costs Business Combination, Acquisition Related Costs 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 Schedule of Goodwill [Table] Schedule of Goodwill [Table] Ovation Ovation [Member] Ovation Credit Services ValuePenguin ValuePenguin [Member] ValuePenguin [Member] 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 Goodwill [Roll Forward] Goodwill [Roll Forward] Goodwill Goodwill, Gross Accumulated impairment losses Goodwill, Impaired, Accumulated Impairment Loss Net goodwill Goodwill Intangible Assets, Net (Including Goodwill) [Abstract] Intangible Assets, Net (Including Goodwill) [Abstract] Intangible assets with indefinite lives Indefinite-lived Intangible Assets (Excluding Goodwill) Intangible assets with definite lives, net Finite-Lived Intangible Assets, Net Total intangible assets, net Intangible Assets, Net (Excluding Goodwill) Payables and Accruals [Abstract] Contribution to LendingTree Foundation Charitable Contribution Accrual Charitable Contribution Accrual 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 Current lease liabilities Operating Lease, Liability, Current Other Other Liabilities, Current Total accrued expenses and other current liabilities Accrued Liabilities, Current ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES Accounts Payable, Accrued Liabilities, and Other Liabilities Disclosure, Current [Text Block] Accounting Estimates Use of Estimates, Policy [Policy Text Block] Certain Risks and Concentrations Concentration Risk, Credit Risk, Policy [Policy Text Block] Litigation Settlements and Contingencies Legal Costs, Policy [Policy Text Block] Recent Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Amortization of intangible assets with definite lives computed on a straight-line basis Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] Remainder of current year Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year 2020 Finite-Lived Intangible Assets, Amortization Expense, Year Two 2021 Finite-Lived Intangible Assets, Amortization Expense, Year Three 2022 Finite-Lived Intangible Assets, Amortization Expense, Year Four 2023 Finite-Lived Intangible Assets, Amortization Expense, Year Five Thereafter Finite-Lived Intangible Assets, Amortization Expense, after Year Five Total intangible assets with definite lives, net BUSINESS ACQUISITION Business Combination Disclosure [Text Block] Discontinued Operations and Disposal Groups [Abstract] Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Table] Disposal Groups, Including Discontinued Operations [Table] Litigation Status [Axis] Litigation Status [Axis] Litigation Status [Domain] Litigation Status [Domain] Pending Settlement Pending Litigation [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] Statement, Operating Activities Segment [Axis] Operating Activities [Axis] Segment, Operating Activities [Domain] Operating Activities [Domain] Discontinued Operations Discontinued Operations [Member] Minimum Minimum [Member] Maximum Maximum [Member] Loss Contingency Nature [Axis] Loss Contingency Nature [Axis] Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] Obligation to Repurchase Receivables Sold [Member] Obligation to Repurchase Receivables Sold [Member] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Subsequent Event Subsequent Event [Member] Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] Home Loan Center, Inc. Home Loan Center, Inc. [Member] Home Loan Center, Inc. [Member] Scenario [Axis] Scenario [Axis] Scenario [Domain] Scenario [Domain] 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. Counterparty Name [Axis] Counterparty Name [Axis] Counterparty Name [Domain] Counterparty Name [Domain] Discover Discover Bank [Member] Represents Discover Bank, a wholly owned subsidiary of Discover Financial Services. DISCONTINUED OPERATIONS Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] 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. Settlement value of indemnification claim and other miscellaneous items Litigation Settlement, Amount Awarded to Other Party Revenue and net income (loss) of discontinued operations Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract] Revenue Disposal Group, Including Discontinued Operation, Revenue Loss before income taxes Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax Income tax benefit Discontinued Operation, Tax Effect of Discontinued Operation Loss from discontinued operations Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent Assets and liabilities of facilities reported as discontinued operations Disposal Group, Including Discontinued Operation, Balance Sheet Disclosures [Abstract] Current liabilities Loss Contingency Accrual Cash Cash Loss recognized Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest Net gain related to removal of HLC Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax Disposal Group, Including Discontinued Operation, Other Expense Disposal Group, Including Discontinued Operation, Other Expense Recognition of liability Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, Net of Tax Dividends Dividends Loss Contingency, Estimate of Possible Loss Loss Contingency, Estimate of Possible Loss Annual interest rate on convertible senior notes Debt Instrument, Interest Rate, Effective Percentage Commitments and Contingencies Disclosure [Abstract] Loss Contingencies [Table] Loss Contingencies [Table] Income Statement Location [Axis] Income Statement Location [Axis] Income Statement Location [Domain] Income Statement Location [Domain] Discontinued Operations, Disposed of by Sale Discontinued Operations, Disposed of by Sale [Member] Litigation Case [Axis] Litigation Case [Axis] Litigation Case [Domain] Litigation Case [Domain] Contingencies Loss Contingencies [Line Items] Accrued litigation liability Estimated Litigation Liability Schedule of purchase price allocation Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block] Schedule of the fair value of definite lived intangible assets acquired 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 acquisitions Business Acquisition, Pro Forma Information [Table Text Block] Statement of Stockholders' Equity [Abstract] Statement [Table] Statement [Table] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Common Stock Common Stock [Member] Additional Paid-in Capital Additional Paid-in Capital [Member] Accumulated Deficit Retained Earnings [Member] Treasury Stock Treasury Stock [Member] Comprehensive Income (Loss) Comprehensive Income [Member] Noncontrolling interest Noncontrolling Interest [Member] Statement Statement [Line Items] Increase (Decrease) in Stockholders' Equity Increase (Decrease) in Stockholders' Equity [Roll Forward] Balance Stockholders' Equity Attributable to Parent Balance (in shares) Shares, Issued Net (loss) income and comprehensive (loss) income Net Income (Loss) Available to Common Stockholders, Basic Non-cash compensation APIC, Share-based Payment Arrangement, Increase for Cost Recognition Purchase of treasury stock Treasury Stock, Value, Acquired, Cost Method Purchase of treasury stock (in shares) Treasury Stock, Shares, Acquired 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 Issuance of 0.625% Convertible Senior Notes, net Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt Settlement of 0.625% Convertible Senior Notes Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt, Subsequent Adjustments Exercise of Convertible Note Hedge Adjustments to Additional Paid in Capital, Exercise of Convertible Note Hedge Transactions Adjustments to Additional Paid in Capital, Exercise of Convertible Note Hedge Transactions Cumulative effect adjustment due to ASU 2014-09 New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification Noncontrolling interest Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Balance Balance (in shares) Cash and Cash Equivalents [Abstract] Schedule of Restricted Cash and Cash Equivalents Restrictions on Cash and Cash Equivalents [Table Text Block] Share-based Payment Arrangement [Abstract] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Vesting [Axis] Vesting [Axis] Vesting [Domain] Vesting [Domain] 100% over a period of one year from the grant date Tranche 3 [Member] Tranche 3 [Member] 33% over a period of three years from the grant date Tranche 1 [Member] Tranche 1 [Member] 25% over a period of four years from the grant date Tranche 2 [Member] Tranche 2 [Member] Award Type [Axis] Award Type [Axis] Award Type [Domain] Award Type [Domain] Aggregate stock options Share-based Payment Arrangement [Member] Employee stock options Share-based Payment Arrangement, Option [Member] Performance options Employee Stock Option 2 [Member] Employee Stock Option 2 [Member] Market options Performance Options [Member] Performance Options STOCK-BASED COMPENSATION Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Stock options, Shares 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 Stock options, 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 Stock options, 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 Stock options, 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 Stock options, Grant Date Fair Value Valuation Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract] Grant date fair value 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 Expected term Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term, Simplified Method Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate Expected dividend rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate Expected volatility, minimum Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Minimum Expected volatility, maximum Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Maximum Risk-free interest rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate 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 Expected dividends Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Payments Maximum number of shared to be earned 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 Percentage of target number of shares 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 Performance Awards Earned Performance Awards Earned Performance Awards Earned Revenue from Contract with Customer [Abstract] REVENUE Revenue from Contract with Customer [Text Block] Statement of Financial Position [Abstract] Accounts receivable, allowance (in dollars) Accounts Receivable, Allowance for Credit Loss, Current Accumulated depreciation of property and equipment 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, issued shares Common Stock, Shares, Issued Common stock, outstanding shares Common Stock, Shares, Outstanding Treasury stock, shares Treasury Stock, Shares Schedule of Finite-Lived Intangible Assets [Table] Schedule of Finite-Lived Intangible Assets [Table] 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 Developed Technology Rights [Member] Customer lists Customer Lists [Member] Trademarks and tradenames Trademarks and Trade Names [Member] Website content Media Content [Member] Other Other Intangible Assets [Member] Intangible assets with definite lives Finite-Lived Intangible Assets [Line Items] Cost Finite-Lived Intangible Assets, Gross Accumulated Amortization Finite-Lived Intangible Assets, Accumulated Amortization GOODWILL AND INTANGIBLE ASSETS Goodwill and Intangible Assets Disclosure [Text Block] SIGNIFICANT ACCOUNTING POLICIES Significant Accounting Policies [Text Block] Disclosure of long lived assets held-for-sale Disclosure of Long Lived Assets Held-for-sale [Table Text Block] Schedule of Long Lived Assets Held-for-sale [Table] Schedule of Long Lived Assets Held-for-sale [Table] Two Office Buildings In Charlotte, NC [Member] Two Office Buildings In Charlotte, NC [Member] Two Office Buildings In Charlotte, NC [Member] Tenant leases Leases, Acquired-in-Place [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] Land Land [Member] 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] Long Lived Assets Held-for-sale [Line Items] Long Lived Assets Held-for-sale [Line Items] Number Of Office Buildings Acquired Number Of Office Buildings Acquired Number Of Office Buildings Acquired Sale price 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 Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax Assets held for sale Assets Held-for-sale, Not Part of Disposal Group, Current 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 Fixed assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment Acquisition Costs, Period Cost Acquisition Costs, Period Cost Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Credit Facility [Axis] Credit Facility [Axis] Credit Facility [Domain] Credit Facility [Domain] Revolving Credit Facility Revolving Credit Facility [Member] Contingent Consideration by Type [Axis] Contingent Consideration by Type [Axis] Contingent Consideration Type [Domain] Contingent Consideration Type [Domain] Contingent earnout Earnout Payment for One Contingent Earnout [Member] Earnout Payment for One Contingent Earnout [Member] Technology Technology-Based Intangible Assets [Member] DepositAccounts DepositAccounts [Member] DepositAccounts [Member] SnapCap SnapCap [Member] SnapCap Business Acquisition [Line Items] Business Acquisition [Line Items] Consideration Transferred Business Combination, Consideration Transferred [Abstract] Net working capital 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. Intangible assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles Goodwill Net deferred tax liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Noncurrent Total preliminary purchase price Business Combination, Consideration Transferred Fair Value of Intangible Assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract] Preliminary Fair Value Finite-lived Intangible Assets Acquired Weighted Average Amortization Life Acquired Finite-lived Intangible Assets, Weighted Average Useful Life Initial cash consideration to acquire business Payments to Acquire Businesses, Gross Net repayment of revolving credit facility Proceeds from Long-term Lines of Credit Contingent consideration Business Combination, Contingent Consideration, Liability Current contingent consideration Business Combination, Contingent Consideration, Liability, Current Non-current contingent consideration Business Combination, Contingent Consideration, Liability, Noncurrent Severance expense Severance Costs Estimated increase to working capital Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Working Capital Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Working Capital Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual 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 Change in fair value of contingent consideration Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability Earnout payment Business Combination, Consideration Transferred, Cash On Hand Business Combination, Consideration Transferred, Cash On Hand Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets Earnout payment Payment for Contingent Consideration Liability, Investing Activities Lehman Brothers Holdings, Inc. Demand Letter Lehman Brothers Holdings, Inc. Demand Letter [Member] Lehman Brothers Holdings, Inc. Demand Letter [Member] Residential Funding Co. v Home Loan Center Residential Funding Co. v Home Loan Center [Member] Residential Funding Co. v Home Loan Center [Member] Residential Funding Company Residential Funding Company [Domain] Residential Funding Company [Domain] Judicial Ruling Judicial Ruling [Member] Pending litigation or appeal Investor [Axis] Investor [Axis] Information by investor Investor [Domain] Investor [Domain] [Domain] for Information by investor Discover Bank Damages Damages [Member] Damages [Member] Pre-Verdict Interest Pre-Verdict Interest [Member] Pre-Verdict Interest [Member] Attorney Fees Attorney Fees [Member] Attorney Fees [Member] Pre-Judgment Interest Pre-Judgment Interest [Member] Pre-Judgment Interest [Member] Loan Loss Obligations Loss Contingency, Number Of Loan Originators Loss Contingency, Number Of Loan Originators Loss Contingency, Number Of Loan Originators Settlement offer Loss Contingency, Pending Claims, Number Loss Contingency, Pending Claims, Number Loss Contingency, Damages Sought, Value Loss Contingency, Damages Sought, Value Activity related to loss reserves on previously sold loans Loss Contingency Accrual [Roll Forward] 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. Line of Credit Facility [Table] Line of Credit Facility [Table] Revolving Credit Facility, Borrowings At Base Rate Plus LIBOR [Member] Revolving Credit Facility, Borrowings At Base Rate Plus LIBOR [Member] Revolving Credit Facility, Borrowings At Base Rate Plus LIBOR [Member] Revolving Credit Facility, 31 Day Borrowing Revolving Credit Facility, 31 Day Borrowing [Member] Revolving Credit Facility, 31 Day Borrowing [Member] Revolving Credit Facility, 32 Day Borrowing Revolving Credit Facility, 30 Day Borrowing [Member] Revolving Credit Facility, 30 Day Borrowing [Member] Fed Funds Effective Rate Overnight Index Swap Rate [Member] Fed Funds Effective Rate Overnight Index Swap Rate [Member] London Interbank Offered Rate (LIBOR) [Member] London Interbank Offered Rate (LIBOR) [Member] Base Rate [Member] Base Rate [Member] Swingline Facility [Member] Swingline Facility [Member] Swingline Facility [Member] Letters of Credit [Member] Letters of Credit [Member] Letters of Credit [Member] Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] Current borrowing capacity Line of Credit Facility, Current Borrowing Capacity Long-term Debt, Current Maturities Long-term Debt, Current Maturities Long-term Debt, Weighted Average Interest Rate, at Point in Time Long-term Debt, Weighted Average Interest Rate, at Point in Time Revolving Credit Facility, term Debt Instrument, Term Revolving Credit Facility, conditional increase to borrowing capacity Line of Credit Facility, Conditional Increase to Borrowing Capacity Line of Credit Facility, Conditional Increase to Borrowing Capacity Ratio of Debt to EBITDA to Increase Revolving Commitment Ratio of Debt to EBITDA to Increase Revolving Commitment Ratio of Debt to EBITDA to Increase Revolving Commitment Increase in borrowing capacity Line Of Credit Facility, Increase Limit Line Of Credit Facility, Increase Limit Revolving Credit Facility, basis spread on variable rate Debt Instrument, Basis Spread on Variable Rate 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 Fees and expense paid to lenders at closing Debt Instrument, Fee Amount 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 Line of Credit Facility, Collateral, 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 Line of Credit Facility, Collateral, Percent of Voting Equity Line of Credit Facility, Collateral, Percent of Voting Equity Line of Credit Facility, Collateral, Percent of Voting Equity Line of Credit Facility, Collateral, 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 Interest Expense, Debt Interest Expense, Debt Debt Instrument, Unused Borrowing Capacity, Fee Debt Instrument, Unused Borrowing Capacity, Fee Amortization of debt issuance costs Amortization of Debt Issuance Costs DEBT Debt Disclosure [Text Block] Leases [Abstract] Operating Lease Maturity, ASC 842 Lessee, Operating Lease, Liability, Payment, Due [Abstract] Remainder of current year Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year Year ending December 31, 2020 Lessee, Operating Lease, Liability, Payments, Due Year Two Year ending December 31, 2021 Lessee, Operating Lease, Liability, Payments, Due Year Three Year ending December 31, 2022 Lessee, Operating Lease, Liability, Payments, Due Year Four Year ending December 31, 2023 Lessee, Operating Lease, Liability, Payments, Due Year Five Thereafter Lessee, Operating Lease, Liability, Payments, Due after Year Five Total lease payments Lessee, Operating Lease, Liability, Payments, Due Less: Interest Lessee, Operating Lease, Liability, Undiscounted Excess Amount Present value of lease liabilities Operating Lease, Liability Operating Lease Maturity, ASC 840 Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] Year ending December 31, 2019 Operating Leases, Future Minimum Payments Due, Next Twelve Months Year ending December 31, 2020 Operating Leases, Future Minimum Payments, Due in Two Years Year ending December 31, 2021 Operating Leases, Future Minimum Payments, Due in Three Years Year ending December 31, 2022 Operating Leases, Future Minimum Payments, Due in Four Years Year ending December 31, 2023 Operating Leases, Future Minimum Payments, Due in Five Years Total Operating Leases, Future Minimum Payments Due Summary of the gross carrying amount, unamortized debt cost and net carrying value of the liability component of the Notes Convertible Debt [Table Text Block] CONTINGENCIES Legal Matters and Contingencies [Text Block] Income Tax Disclosure [Abstract] INCOME TAXES Income Tax Disclosure [Text Block] Operating cash flows from operating leases Operating Lease, Payments Right-of-use assets obtained in exchange for new operating lease liabilities Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Operating lease cost Operating Lease, Cost Short-term lease cost Short-term Lease, Cost Total lease cost Lease, Cost Weighted average remaining lease term Operating Lease, Weighted Average Remaining Lease Term Weighted average discount rate Operating Lease, Weighted Average Discount Rate, Percent Schedule of income tax (expense) benefit Schedule of income tax provision benefit [Table Text Block] [Table Text Block] for Schedule of income tax provision benefit [Table] Reconciliation of income tax (expense) benefit Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Statement of Cash Flows [Abstract] Student Loan Hero [Member] Student Loan Hero [Member] Student Loan Hero [Member] 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 Less: Loss from discontinued operations, net of tax 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 Noncash Expense (Benefit) The noncash component of income tax expense for the period representing the increase (decrease) in the entity's deferred tax assets and liabilities pertaining to continuing operations. Bad debt expense Accounts Receivable, Credit Loss Expense (Reversal) Amortization of convertible debt discount Amortization of Debt Discount (Premium) ROU asset amortization, offset by change in 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 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 sale of fixed assets Proceeds from Sale of Property, Plant, and Equipment Acquisition of businesses, net of cash acquired Payments to Acquire Businesses, Net of Cash Acquired Acquisition of businesses Other investing activities Payments for (Proceeds from) Other Investing Activities Net cash used in investing activities attributable to continuing operations Net Cash Provided by (Used in) Investing Activities, Continuing Operations 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 (Payments) Related To Net-Share Settlement Of Stock-Based Compensation, Net Proceeds (Payments) Related To Net-Share Settlement Of Stock-Based Compensation, Net Contingent consideration payments Payment for Contingent Consideration Liability, Financing Activities Repayments of Long-term Lines of Credit Repayments of Long-term Lines of Credit Purchase of treasury stock Payments for Repurchase of Common Stock Other financing activities Proceeds from (Payments for) Other Financing Activities Net Cash Provided by (Used in) Financing Activities Net Cash Provided by (Used in) Financing Activities, Continuing Operations Total cash used in continuing operations Net Cash Provided by (Used in) Continuing Operations 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 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 Non-cash investing activities: Noncash Investing and Financing Items [Abstract] Capital additions from tenant improvement allowance Lease Obligation Incurred Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Antidilutive Securities [Axis] Antidilutive Securities [Axis] Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Restricted Stock [Member] Restricted Stock [Member] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Calculation of weighted average common shares Weighted Average Number of Shares Outstanding Reconciliation [Abstract] Weighted average common shares, basic Weighted Average Number of Shares Outstanding, Basic Effect of dilutive securities Incremental Weighted Average Shares Attributable to Dilutive Effect [Abstract] 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 (in shares) Incremental Common Shares Attributable to Dilutive Effect of Call Options and Warrants Weighted average common shares, diluted Weighted Average Number of Shares Outstanding, Diluted Common stock repurchases Disclosure of Repurchase Agreements [Abstract] Value of common stock authorized to be repurchased Stock Repurchase Program, Authorized Amount Treasury Stock, Value, Acquired, Cost Method Remaining authorized repurchase amount Stock Repurchase Program, Remaining Authorized Repurchase Amount LEASES Lessee, Operating Leases [Text Block] LEASES Lessor, Operating Leases [Text Block] Disaggregation of Revenue [Table Text Block] Disaggregation of Revenue [Table Text Block] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Restricted cash and cash equivalents Restricted Cash and Cash Equivalents, Current Cash, cash equivalents, restricted cash and restricted cash equivalents at beginning of period Class of Stock [Axis] Class of Stock [Axis] Class of Stock [Domain] Class of Stock [Domain] ASSETS: Assets [Abstract] Accounts receivable (net of allowance of $1,823 and $1,143, respectively) Accounts Receivable, after Allowance for Credit Loss, Current Prepaid and other current assets Prepaid Expense and Other Assets, Current Current assets of discontinued operations Disposal Group, Including Discontinued Operation, Assets, Current Total current assets Assets, Current Property and equipment (net of accumulated depreciation of $16,068 and $13,887, respectively) Property, Plant and Equipment, Net Intangible assets, net Deferred income tax assets Deferred Tax Assets, Net, Noncurrent Other non-current assets Other Assets, Noncurrent Non-current assets of discontinued operations Disposal Group, Including Discontinued Operation, Assets, Noncurrent Total assets LIABILITIES: Liabilities [Abstract] Revolving credit facility Accounts payable, trade Accounts Payable, Trade, Current Accrued expenses and other current liabilities Current liabilities of discontinued operations Disposal Group, Including Discontinued Operation, Liabilities, Current Total current liabilities Liabilities, Current Long-term debt Long-term Debt, Excluding Current Maturities Deferred income tax liabilities Deferred Tax Liabilities, Net, Noncurrent Other non-current liabilities Other Liabilities, Noncurrent Total liabilities Commitments and contingencies 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; 15,635,268 and 15,428,351 shares issued, respectively, and 12,998,101 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; 2,637,167 and 2,618,587 shares, respectively Treasury Stock, Value Total shareholders' equity Total liabilities and shareholders' equity Liabilities and Equity CASH AND RESTRICTED CASH Restricted Assets Disclosure [Text Block] Schedule of revenue and net income (loss) 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 Schedule of weighted average basic and diluted common shares Schedule of Weighted Average Number of Shares [Table Text Block] Plan Name [Axis] Plan Name [Axis] Plan Name [Domain] Plan Name [Domain] Award Date [Axis] Award Date [Axis] Award Date [Domain] Award Date [Domain] Award Type [Domain] 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] Schedule of stock option valuation assumptions Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Schedule of changes in outstanding stock options with market conditions Schedule of Nonvested Performance Based Stock Options [Table Text Block] Schedule of Nonvested Performance Based Stock Options [Table Text Block] Schedule of changes in outstanding non-vested RSUs and restricted stock Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block] Schedule of changes in outstanding nonvested RSUs and restricted stock with performance and market conditions Schedule of Nonvested Performance-based Units Activity [Table Text Block] Cover page. Entity Interactive Data Current Entity Interactive Data Current Title of 12(b) Security Title of 12(b) Security Entity Address, Address Line One Entity Address, Address Line One Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Entity File Number Entity File Number Document Quarterly Report Document Quarterly Report Document Transition Report Document Transition Report Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Document Type Document Type Document Period End Date Document Period End Date Amendment Flag Amendment Flag Current Fiscal Year End Date Current Fiscal Year End Date Entity Current Reporting Status Entity Current Reporting Status Entity Filer Category Entity Filer Category Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Entity Emerging Growth Company Entity Emerging Growth Company Entity Small Business Entity Small Business Entity Shell Company Entity Shell Company Entity Tax Identification Number Entity Tax Identification Number 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 Trading Symbol Trading Symbol Security Exchange Name Security Exchange Name Summary of Lease Expense and Weighted Average Lease, Cost [Table Text Block] Lessee operating leases supplemental cash flow information and noncash activity table LesseeOperatingLeasesSupplementalCashFlowInformationandNoncashActivityTable [Table Text Block] Lessee operating leases supplemental cash flow information and noncash activity table Operating Lease Maturity Lessee, Operating Lease, Liability, Maturity [Table Text Block] Operating Lease Maturity ASC 840 Lessee, Operating Lease, Disclosure [Table Text Block] Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table] Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table] 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] Non-cash compensation expense related to equity awards Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] Total non-cash compensation Share-based Payment Arrangement, Expense Fair Value Disclosures [Abstract] FAIR VALUE MEASUREMENTS Fair Value Disclosures [Text Block] 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] 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 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 General and administrative expense General and Administrative Expense Product development Research and Development Expense Severance Litigation settlements and contingencies Gain (Loss) Related to Litigation Settlement Total costs and expenses Costs and Expenses Operating income Operating Income (Loss) Other (expense) income, net: Other Nonoperating Income (Expense) [Abstract] Interest expense, net Interest Income (Expense), Net Other income (expense) Other Nonoperating Income (Expense) Income before income taxes Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest Income tax (expense) benefit Income Tax Expense (Benefit) Net income from continuing operations Loss from discontinued operations, net of tax Net income and comprehensive income Weighted average shares outstanding: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Basic Diluted Income per share from continuing operations: Earnings Per Share, Basic and Diluted [Abstract] 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 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) 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: Basic (in dollars per share) Earnings Per Share, Basic Diluted (in dollars per share) Earnings Per Share, Diluted Organization, Consolidation and Presentation of Financial Statements [Abstract] ORGANIZATION Business Description and Basis of Presentation [Text Block] Restricted Stock Units (RSUs) Restricted Stock Units (RSUs) [Member] Restricted Stock Units with performance conditions Performance Shares [Member] Restricted Stock with performance conditions Performance-Based Restricted Stock [Member] Performance-Based Restricted Stock [Member] Restricted Stock with market conditions Market-Based Restricted Stock [Member] Market-Based Restricted Stock Nonvested RSUs, Restricted Stock and Restricted Stock Units with Performance Conditions, 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 Granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 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, Restricted Stock and Restricted Stock Units with Performance Conditions, 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) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value 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) Schedule of mortgage and non-mortgage product revenue Schedule of Segment Reporting Information, by Segment [Table Text Block] ASSETS HELD FOR SALE Disposal Groups, Including Discontinued Operations, Disclosure [Text Block] DISCONTINUED OPERATIONS Schedule of accrued expenses and other current liabilities Schedule of Accrued Liabilities [Table 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] Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Credit Cards Credit Cards [Member] Credit Cards [Member] Personal Loans Personal Loans [Member] Personal Loans [Member] Insurance Insurance [Member] Insurance Other Products And Services Other Products And Services [Member] Other Products And Services [Member] Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] 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 Estimated variable consideration, increase in revenue Contract with Customer, Liability, Cumulative Catch-up Adjustment to Revenue, Change in Estimate of Transaction Price Convertible Notes Payable [Member] Convertible Notes Payable [Member] Aggregate principal amount of convertible senior notes Convertible Debt Initial conversion rate, shares per $1,000 principal amount of notes 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 rate, sales price of common stock as a percentage of the conversion price Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger Threshold trading days Debt Instrument, Convertible, Threshold Trading Days Threshold consecutive trading days Debt Instrument, Convertible, Threshold Consecutive Trading Days Conversion rate, sales price of common stock as a percentage of the conversion price, five business days Debt Instrument, Convertible, Threshold Percentage Of Stock Price Trigger, Five Business Days Debt Instrument, Convertible, Threshold Percentage Of Stock Price Trigger, Five Business Days Cash repurchase at a price equal to the principal amount of the notes, 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 Debt component of the principal amount of the Convertible Senior Notes Convertible Debt, Noncurrent Equity component of the principal amount of the Convertible Senior Notes Debt Instrument, Convertible, Carrying Amount of Equity Component Financing costs related to the issuance of the Convertible Senior Notes Debt Issuance Costs, Gross Debt issuance costs, liability component Debt issuance costs, liability component Debt issuance costs, liability component Debt issuance costs, equity component Debt issuance costs, equity component Debt issuance costs, equity component Total interest expense on the Convertible Senior Notes Interest expense recognized associated with the 0.625% coupon rate Interest Expense, Debt, Excluding Amortization Fair value of the Convertible Senior Notes using a Level 1 observable input Long-term Debt, Fair Value Unamortized debt discount Debt Instrument, Unamortized Discount Lessee, Lease, Description [Table] Lessee, Lease, Description [Table] Lessee, Lease, Description [Line Items] Lessee, Lease, Description [Line Items] Number of renewal options Lessee, Operating Lease, Number Of Renewal Options Lessee, Operating Lease, Number Of Renewal Options Renewal term Lessee, Operating Lease, Renewal Term Rental income Operating Lease, Lease Income Operating lease right-of-use asset Operating Lease, Right-of-Use Asset Impairment loss Operating Lease, Impairment Loss Contingent consideration payment Contingent consideration payments Value of potential contingent consideration 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 One-time contingent consideration performance payment Business Combination, Contingent Consideration, One-Time Performance Payment Business Combination, Contingent Consideration, One-Time Performance Payment Number Of Contingent Consideration Payments Number Of Contingent Consideration Payments Number Of Contingent Consideration Payments STOCK-BASED COMPENSATION Share-based Payment Arrangement [Text Block] Income Tax Disclosure [Table] Operating Loss Carryforwards [Table] Income Tax Authority [Axis] Income Tax Authority [Axis] Income Tax Authority [Domain] Income Tax Authority [Domain] Federal Domestic Tax Authority [Member] Income Tax Disclosure [Line Items] Operating Loss Carryforwards [Line Items] Effective tax rates (as a percent) Effective Income Tax Rate Reconciliation, Percent Federal statutory income tax rate (as a percentage) Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Income tax expense - excluding excess tax benefit on stock compensation Income Tax Expense Excluding Excess Tax Benefit on Stock Compensation Income Tax Expense Excluding Excess Tax Benefit on Stock Compensation Excess tax benefits on stock compensation Proceeds and Excess Tax Benefit from Share-based Compensation Tax benefit from federal research tax credit Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount SEGMENT INFORMATION Segment Reporting Disclosure [Text Block]