Leases [Abstract] Lessee, Lease, Description [Table] Lessee, Lease, Description [Table] Lease Contractual Term [Axis] Lease Contractual Term [Axis] Lease Contractual Term [Axis] Lease Contractual Term [Domain] Lease Contractual Term [Domain] [Domain] for Lease Contractual Term [Axis] Principal Executive Offices Principal Executive Offices [Member] Principal Executive Offices [Member] Statistical Measurement [Axis] Statistical Measurement [Axis] Statistical Measurement [Domain] Statistical Measurement [Domain] Minimum Minimum [Member] Maximum Maximum [Member] 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 Operating lease right-of-use assets Operating Lease, Right-of-Use Asset Present value of lease liabilities Operating Lease, Liability Rental income Operating Lease, Lease Income Goodwill and Intangible Assets Disclosure [Abstract] GOODWILL AND INTANGIBLE ASSETS Goodwill and Intangible Assets 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 Revenue from Contract with Customer [Abstract] Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Segments [Axis] Segments [Axis] Segments [Domain] Segments [Domain] Home Segment [Member] Home Segment [Member] Home Segment [Member] Consumer Segment [Member] Consumer Segment [Member] Consumer Segment [Member] Insurance Segment [Member] Insurance Segment [Member] Insurance Segment [Member] Product and Service [Axis] Product and Service [Axis] Product and Service [Domain] Product and Service [Domain] Credit Cards Credit Cards [Member] Credit Cards [Member] Personal Loans Personal Loans [Member] Personal Loans [Member] Other Consumer Other Consumer [Member] Other Consumer [Member] 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 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] Award Type [Axis] Award Type [Axis] Award Type [Domain] Award Type [Domain] 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 STOCK-BASED COMPENSATION Share-based Compensation Arrangement by Share-based Payment Award [Line Items] 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 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) Equity Method Investments and Joint Ventures [Abstract] Schedule of Equity Method Investments [Table] Schedule of Equity Method Investments [Table] Investment, Name [Axis] Investment, Name [Axis] Investment, Name [Domain] Investment, Name [Domain] Stash Stash Financial, Inc. [Member] Stash Financial, Inc. [Member] Schedule of Equity Method Investments [Line Items] Schedule of Equity Method Investments [Line Items] Equity investment, original cost Equity Method Investment, Aggregate Cost 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] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Subsequent Event Subsequent Event [Member] Litigation Case [Axis] Litigation Case [Axis] Litigation Case [Domain] Litigation Case [Domain] Lehman Brothers Holdings, Inc. Demand Letter Lehman Brothers Holdings, Inc. Demand Letter [Member] Lehman Brothers Holdings, Inc. Demand Letter [Member] 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] Loss Contingency Nature [Axis] Loss Contingency Nature [Axis] Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] Obligation to Repurchase Receivables Sold Obligation to Repurchase Receivables Sold [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] 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] Loss Contingency, Damages Sought, Value Loss Contingency, Damages Sought, Value Assets Assets Loss contingency accrual Loss Contingency Accrual Loss contingency settlement payment Loss Contingency Accrual, Payments 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] 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 Recognition of liability Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, Net of Tax Dividends Dividends Annual interest rate on convertible senior notes Debt Instrument, Interest Rate, Effective Percentage 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] Cash and Cash Equivalents [Abstract] 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 Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Business Combinations [Abstract] Schedule of Business Acquisitions by Acquisition, Contingent Consideration [Table] Schedule of Business Acquisitions by Acquisition, Contingent Consideration [Table] Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Contingent Consideration by Type [Axis] Contingent Consideration by Type [Axis] Contingent Consideration Type [Domain] Contingent Consideration Type [Domain] Business Acquisition, Contingent Consideration [Line Items] Business Acquisition, Contingent Consideration [Line Items] Schedule of Business Acquisitions by Acquisition, Contingent Consideration [Table Text Block] Schedule of Business Acquisitions by Acquisition, Contingent Consideration [Table 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 2021 Finite-Lived Intangible Assets, Amortization Expense, Year Two 2022 Finite-Lived Intangible Assets, Amortization Expense, Year Three 2023 Finite-Lived Intangible Assets, Amortization Expense, Year Four 2024 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 Finite-Lived Intangible Assets, Net REVENUE Revenue from Contract with Customer [Text Block] Commitments and Contingencies Disclosure [Abstract] CONTINGENCIES Legal Matters and Contingencies [Text Block] Vesting [Axis] Vesting [Axis] Vesting [Domain] Vesting [Domain] 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] Option Share-based Payment Arrangement, Option [Member] Aggregate stock options Share-based Payment Arrangement [Member] Market options Performance Options [Member] Performance Options 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] Share price Share Price 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 Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Minimum Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Minimum Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Maximum Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Maximum Risk-free interest rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Expected dividends Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Payments Income Statement [Abstract] Statement [Table] Statement [Table] Scenario [Axis] Scenario [Axis] Scenario [Domain] Scenario [Domain] Statement [Line Items] Statement [Line Items] 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 Depreciation Depreciation, Depletion and Amortization Amortization of intangibles Amortization of Intangible Assets Change in fair value of contingent consideration Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability Severance Severance Costs Litigation settlements and contingencies Gain (Loss) Related to Litigation Settlement Total costs and expenses Costs and Expenses Operating (loss) income Operating Income (Loss) Other (expense) income, net: Other Nonoperating Income (Expense) [Abstract] Interest expense, net Interest Income (Expense), Net Other income Other Nonoperating Income (Expense) (Loss) income before income taxes Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest Income tax benefit Income Tax Expense (Benefit) Net (loss) income from continuing operations Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent Loss from discontinued operations, net of tax Net (loss) income and comprehensive (loss) income Net Income (Loss) Available to Common Stockholders, Basic Weighted average shares outstanding: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Basic Weighted Average Number of Shares Outstanding, Basic Diluted Weighted Average Number of Shares Outstanding, Diluted (Loss) 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 (loss) income per share: Earnings Per Share [Abstract] Basic (in dollars per share) Earnings Per Share, Basic Diluted (in dollars per share) Earnings Per Share, Diluted Fair Value Disclosures [Abstract] Fair Value Measurement Inputs and Valuation Techniques [Table] Fair Value Measurement Inputs and Valuation Techniques [Table] Valuation Approach and Technique [Axis] Valuation Approach and Technique [Axis] Valuation Approach and Technique [Domain] Valuation Approach and Technique [Domain] Option pricing model Valuation Technique, Option Pricing Model [Member] Measurement Basis [Axis] Measurement Basis [Axis] Fair Value Measurement [Domain] Fair Value Measurement [Domain] Portion at Fair Value Measurement [Member] Portion at Fair Value Measurement [Member] Fair Value Estimate of Fair Value Measurement [Member] Weighted average Weighted Average [Member] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Level 3 Fair Value, Inputs, Level 3 [Member] Measurement Input Type [Axis] Measurement Input Type [Axis] Measurement Input Type [Domain] Measurement Input Type [Domain] Operating results growth rate Measurement Input, Long-term Revenue Growth Rate [Member] Discount rate Measurement Input, Discount Rate [Member] Fair Value Measurement Inputs and Valuation Techniques [Line Items] Fair Value Measurement Inputs and Valuation Techniques [Line Items] Contingent consideration Business Combination, Contingent Consideration, Liability Contingent consideration, measurement input Business Combination, Contingent Consideration, Liability, Measurement Input Debt Disclosure [Abstract] 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] Subsequent Events [Abstract] Subsequent Event [Table] Subsequent Event [Table] Variable Rate [Axis] Variable Rate [Axis] Variable Rate [Domain] Variable Rate [Domain] LIBOR London Interbank Offered Rate (LIBOR) [Member] Base Rate Base Rate [Member] Credit Facility [Axis] Credit Facility [Axis] Credit Facility [Domain] Credit Facility [Domain] Revolving Credit Facility Revolving Credit Facility [Member] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Line of Credit Line of Credit [Member] Convertible Debt Convertible Debt [Member] Subsequent Event [Line Items] Subsequent Event [Line Items] Current borrowing capacity Line of Credit Facility, Current Borrowing Capacity Revolving Credit Facility, basis spread on variable rate Debt Instrument, Basis Spread on Variable Rate Floor interest rate Debt Instrument, Floor Interest Rate Debt Instrument, Floor Interest Rate Unused capacity, commitment fee percentage Line of Credit Facility, Unused Capacity, Commitment Fee Percentage Repayments of debt Repayments of Long-term Lines of Credit Aggregate principal amount of convertible senior notes Debt Instrument, Face Amount Annual interest rate on convertible senior notes Debt Instrument, Interest Rate, Stated Percentage Proceeds from convertible debt Proceeds from 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 Initial conversion price per share Debt Instrument, Convertible, Conversion Price Repayments of convertible debt Repayments of Convertible Debt Debt repurchase amount Debt Instrument, Repurchased Face Amount 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 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 Proceeds from hedge and warrants Proceeds from Hedge and Warrants Proceeds from Hedge and Warrants Payables and Accruals [Abstract] Schedule of accrued expenses and other current liabilities Schedule of Accrued Liabilities [Table Text Block] Loss Contingencies [Table] Loss Contingencies [Table] Residential Funding Company Residential Funding Company [Domain] Residential Funding Company [Domain] Residential Funding Co. v Home Loan Center Residential Funding Co. v Home Loan Center [Member] Residential Funding Co. v Home Loan Center [Member] Lehman Brothers Holdings Inc. v. LendingTree, LLC Lehman Brothers Holdings Inc. v. LendingTree, LLC [Member] Lehman Brothers Holdings Inc. v. LendingTree, LLC [Member] Pending litigation or appeal Judicial Ruling Judicial Ruling [Member] Settled Settled Litigation [Member] Discover Bank ResCap ResCap [Member] ResCap [Member] 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 Contingencies [Line Items] Loss Contingency, Number Of Loan Originators Loss Contingency, Number Of Loan Originators Loss Contingency, Number Of Loan Originators Loss Contingency, Pending Claims, Number Loss Contingency, Pending Claims, Number Settlement offer 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. Income Tax Disclosure [Abstract] INCOME TAXES Income Tax Disclosure [Text Block] Segment Reporting [Abstract] Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Consolidation Items [Axis] Consolidation Items [Axis] Consolidation Items [Domain] Consolidation Items [Domain] Subsegments [Axis] Subsegments [Axis] Subsegments [Domain] Subsegments [Domain] Subsegments Consolidation Items [Axis] Subsegments Consolidation Items [Axis] Subsegments Consolidation Items [Domain] Subsegments Consolidation Items [Domain] Segment Information Segment Reporting Information [Line Items] Schedule of Segment Reporting Information, by Segment Schedule of Segment Reporting Information, by Segment [Table Text Block] SEGMENT INFORMATION Segment Reporting Disclosure [Text Block] 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 BUSINESS ACQUISITION Business Combination Disclosure [Text Block] 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 Excess tax benefit on stock compensation Excess Tax Benefit on Stock Compensation, Income Tax Expense (Benefit) Excess Tax Benefit on Stock Compensation, Income Tax Expense (Benefit) Income tax benefit from CARES Act CARES Act, Income Tax Expense (Benefit) CARES Act, Income Tax Expense (Benefit) SUBSEQUENT EVENTS Subsequent Events [Text Block] 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 Notes Payable [Member] Convertible Notes Payable [Member] Debt Instrument [Line Items] Debt Instrument [Line Items] Aggregate principal amount of convertible senior notes Convertible Debt 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, Debt Interest expense recognized associated with the 0.625% coupon rate Interest Expense, Debt, Excluding Amortization Amortization of convertible debt discount Amortization of Debt Discount (Premium) Amortization of debt issuance costs Amortization of Debt Issuance Costs Long-term debt Long-term Debt, Excluding Current Maturities 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 SHAREHOLDERS' EQUITY Earnings Per Share [Text Block] Credit Loss [Abstract] Reconciliation of allowance for doubtful accounts Accounts Receivable, Allowance for Credit Loss [Table Text Block] Statement of Financial Position [Abstract] ASSETS: Assets [Abstract] Accounts receivable (net of allowance of $1,756 and $1,466, 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 $20,971 and $17,979, respectively) Property, Plant and Equipment, Net Goodwill Goodwill Intangible assets, net Intangible Assets, Net (Excluding Goodwill) Deferred income tax assets Deferred Income Tax Assets, Net Equity investment (Note 7) Equity Method Investments 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 Long-term Debt, Current Maturities Accounts payable, trade Accounts Payable, Trade, Current Accrued expenses and other current liabilities Accrued Liabilities, Current Current contingent consideration Business Combination, Contingent Consideration, Liability, Current Current liabilities of discontinued operations Disposal Group, Including Discontinued Operation, Liabilities, Current Total current liabilities Liabilities, Current Operating lease liabilities Operating Lease, Liability, Noncurrent Non-current contingent consideration Business Combination, Contingent Consideration, Liability, Noncurrent Other non-current liabilities Other Liabilities, Noncurrent Total liabilities 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; 15,730,643 and 15,676,819 shares issued, respectively, and 13,089,325 and 13,035,501 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 shares Treasury Stock, Value Total shareholders' equity Stockholders' Equity Attributable to Parent Total liabilities and shareholders' equity Liabilities and Equity Remainder of current year Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months Year ending December 31, 2021 Lessee, Operating Lease, Liability, Payments, Due Year Two Year ending December 31, 2022 Lessee, Operating Lease, Liability, Payments, Due Year Three Year ending December 31, 2023 Lessee, Operating Lease, Liability, Payments, Due Year Four Year ending December 31, 2024 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 Less: Tenant improvement allowances Payments for (Proceeds from) Tenant Allowance Accounting Policies [Abstract] 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] 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] 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 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 Number of reportable segments Number of Reportable Segments 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] Class of Stock [Axis] Class of Stock [Axis] Class of Stock [Domain] Class of Stock [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] 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 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] Schedule of Restricted Cash and Cash Equivalents Restrictions on Cash and Cash Equivalents [Table Text Block] LEASES Lessee, Operating Leases [Text Block] 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 Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] 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 and Escrows, Current Customer Deposits and Escrows, Current Contribution to LendingTree Foundation Charitable Contribution Accrual Charitable Contribution Accrual Current lease liabilities Operating Lease, Liability, Current Other Other Liabilities, Current Total accrued expenses and other current liabilities Schedule of weighted average basic and diluted common shares Schedule of Weighted Average Number of Shares [Table Text Block] ALLOWANCE FOR DOUBTFUL ACCOUNTS Credit Loss, Financial Instrument [Text Block] ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES Accounts Payable, Accrued Liabilities, and Other Liabilities Disclosure, Current [Text Block] Schedule of Goodwill [Table] Schedule of Goodwill [Table] Ovation Ovation [Member] Ovation Credit Services QuoteWizard QuoteWizard [Member] QuoteWizard [Member] ValuePenguin ValuePenguin [Member] ValuePenguin [Member] Goodwill [Line Items] Goodwill [Line Items] Goodwill [Roll Forward] Goodwill [Roll Forward] Goodwill Goodwill, Gross Accumulated impairment losses Goodwill, Impaired, Accumulated Impairment Loss Net 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 Total intangible assets, net STOCK-BASED COMPENSATION Share-based Payment Arrangement [Text Block] Cover [Abstract] Document Type Document Type Document Quarterly Report Document Quarterly 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 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 Current Reporting Status Entity Current Reporting Status Entity Interactive Data Current Entity Interactive Data Current Entity Filer Category Entity Filer Category Entity Emerging Growth Company Entity Emerging Growth Company Entity Small Business Entity Small Business Entity Shell Company Entity Shell Company Amendment Flag Amendment Flag Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Entity Central Index Key Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date 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 Line of Credit Facility [Table] Line of Credit Facility [Table] 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, 31 Day Borrowing, Two [Member] Revolving Credit Facility, 31 Day Borrowing, Two [Member] Fed Funds Effective Rate Overnight Index Swap Rate [Member] Fed Funds Effective Rate Overnight Index Swap 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] Letters of Credit Outstanding, Amount Letters of Credit Outstanding, Amount Credit Agreement, Potential Additional Borrowing Capacity Credit Agreement, Potential Additional Borrowing Capacity Credit Agreement, Potential Additional Borrowing Capacity Line of Credit Facility, Maximum Borrowing Capacity Line of Credit Facility, Maximum Borrowing Capacity 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 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 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, 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 Debt Instrument, Unused Borrowing Capacity, Fee Debt Instrument, Unused Borrowing Capacity, Fee 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 Bad debt expense Accounts Receivable, Credit Loss Expense (Reversal) Write-off of uncollectible accounts receivable Accounts Receivable, Allowance for Credit Loss, Writeoff Recoveries collected Accounts Receivable, Allowance for Credit Loss, Recovery Balance, end of the period Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] DepositAccounts DepositAccounts [Member] DepositAccounts [Member] Business Acquisition [Line Items] Business Acquisition [Line Items] Contingent consideration payments Payment for Contingent Consideration Liability, Financing Activities Business Combination, Contingent Consideration, Future Known Payment Business Combination, Contingent Consideration, Future Known Payment Business Combination, Contingent Consideration, Future Known Payment 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 Organization, Consolidation and Presentation of Financial Statements [Abstract] ORGANIZATION Business Description and Basis of Presentation [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 Debt Instrument, Redemption, Period [Axis] Debt Instrument, Redemption, Period [Axis] Debt Instrument, Redemption, Period [Domain] Debt Instrument, Redemption, Period [Domain] 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 Proceeds from the sale of warrants Proceeds from Issuance of Warrants DEBT Debt Disclosure [Text Block] Statement of Stockholders' Equity [Abstract] 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] Statement Increase (Decrease) in Stockholders' Equity Increase (Decrease) in Stockholders' Equity [Roll Forward] Balance Balance (in shares) Shares, Issued Net (loss) income and comprehensive (loss) income 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 Stockholders' Equity, Other Stockholders' Equity, Other Balance Balance (in shares) Schedule of income tax 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 benefit Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] 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] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Calculation of weighted average common shares Weighted Average Number of Shares Outstanding Reconciliation [Abstract] Weighted average common shares, 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 Antidilutive securities excluded from computation of earnings per share (in shares) 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 Treasury Stock, Value, Acquired, Cost Method Remaining authorized repurchase amount Stock Repurchase Program, Remaining Authorized Repurchase Amount 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] Schedule of fair value measurement valuation Fair Value Measurement Inputs and Valuation Techniques [Table Text Block] Discontinued Operations, Disposed of by Sale Discontinued Operations, Disposed of by Sale [Member] Contingencies Accrued litigation liability Estimated Litigation Liability Statement of Cash Flows [Abstract] SnapCap SnapCap [Member] SnapCap Cash flows from operating activities attributable to continuing operations: Net Cash Provided by (Used in) Operating Activities, Continuing Operations [Abstract] Less: Loss from discontinued operations, net of tax Net income from continuing operations 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] Loss (gain) on impairments and disposal of assets Gain (Loss) on Disposition of Property Plant Equipment 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. 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 Equity investment Payments to Acquire Equity Method Investments Acquisition of businesses, net of cash acquired Payments to Acquire Businesses, Net of Cash Acquired 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 (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 Net proceeds from (repayment of) revolving credit facility Proceeds from (Repayments of) Long-term Debt and Capital Securities 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 Provided by (Used in) Financing Activities Net Cash Provided by (Used in) Financing Activities Total cash provided by (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 increase (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 at end of period Non-cash investing activities: Noncash Investing and Financing Items [Abstract] Capital additions from tenant improvement allowance Lease Obligation Incurred DISCONTINUED OPERATIONS Disposal Groups, Including Discontinued Operations, Disclosure [Text Block] FAIR VALUE MEASUREMENTS Fair Value Disclosures [Text Block] Income tax benefit (expense) - excluding excess tax benefit on stock compensation and CARES Act Income Tax Expense Excluding Excess Tax Benefit on Stock Compensation Income Tax Expense Excluding Excess Tax Benefit on Stock Compensation Income tax benefit CASH AND RESTRICTED CASH Restricted Assets Disclosure [Text Block] EQUITY INVESTMENT Equity Method Investments and Joint Ventures Disclosure [Text Block] SIGNIFICANT ACCOUNTING POLICIES Significant Accounting Policies [Text Block] Other Segments [Member] Other Segments [Member] Segment marketing expense Cost of Revenue and Marketing Expense Cost of Revenue and Marketing Expense Segment profit (loss) Gross Profit Cost of revenue Other Cost of Operating Revenue Brand and other marketing expense Other Selling and Marketing Expense Severance Restructuring Charges Operating income (loss) Interest expense, net Interest Expense Other Income Other Income Income (loss) before income taxes and discontinued operations