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Retained earnings Retained Earnings (Accumulated Deficit) Restructuring and Related Activities [Abstract] Restructuring and Related Activities [Abstract] Threshold trading days exceeding price Debt Instrument, Convertible, Threshold Trading Days Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Common Stock Common Stock Common Stock [Member] Aggregate Fair Value Available-for-sale securities Debt Securities, Available-for-Sale Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Cover page. Cover [Abstract] International Non-US [Member] Foreign currency translation Goodwill, Foreign Currency Translation, Gain (Loss) Equity Awards Adjustments Equity Awards Adjustments [Member] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Total liabilities and stockholders’ equity Liabilities and Equity Employee Stock Option Share-Based Payment Arrangement, Option [Member] Segments [Axis] Segments [Axis] Purchase of note hedge related to convertible senior notes, net of deferred taxes of $215,734 Adjustments To Additional Paid In Capital Purchase Of Note Hedge Related To Convertible Senior Notes Adjustments To Additional Paid In Capital Purchase Of Note Hedge Related To Convertible Senior Notes Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Restructuring charges Restructuring Charges Schedule of Net Accounts Receivable Schedule of 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authorized (in shares) Preferred Stock, Shares Authorized Preferred stock, $0.01 par value; 5,000,000 shares authorized; 700,000 shares designated as Series A Junior Participating Preferred Stock; no shares issued or outstanding Preferred Stock, Value, Issued Adjustment to Compensation: Adjustment to Compensation [Axis] Service-based stock awards Restricted Stock Awards, Restricted Stock Units And Deferred Stock Units Service Based [Member] Restricted Stock Awards, Restricted Stock Units And Deferred Stock Units Service Based Interest and marketable securities income, net Interest and marketable securities income, net Interest And Marketable Securities Income (Loss), Net Interest And Marketable Securities Income (Loss), Net Class of Stock [Domain] Class of Stock [Domain] Restructuring Cost and Reserve [Line Items] Restructuring Cost and Reserve [Line Items] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate 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Award, Amortization Of Capitalized Amounts Accounts payable Accounts Payable, Current Pay vs Performance Disclosure [Line Items] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Other non-cash reconciling items, net Other Noncash Income (Expense) Debt Instrument [Line Items] Debt Instrument [Line Items] Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Additional Paid-in Capital Additional Paid-in Capital [Member] Entity Filer Category Entity Filer Category Name Trading Arrangement, Individual Name Cash and cash equivalents Cash and cash equivalents Cash and Cash Equivalent Capitalization of internal-use software development costs Payments for Software Company Selected Measure Amount Company Selected Measure Amount Depreciation and amortization Depreciation, Depletion and Amortization Schedule of Stock by Class [Table] Stock, Class of Stock [Table] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Accounts and Financing 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Operation Purchase of note hedges, net of tax Convertible Debt, Deferred Taxes Convertible Debt, Deferred Taxes Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Debt Instrument, Convertible Terms Of Conversion [Domain] Debt Instrument, Convertible Terms Of Conversion [Domain] Debt Instrument, Convertible Terms Of Conversion [Domain] Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] AOCI Attributable to Parent, Net of Tax [Roll Forward] Net income Net income Net income Net Income (Loss) Attributable to Parent Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Convertible Notes Convertible Notes [Member] Convertible Notes Balance Sheet Location [Axis] Location, Statement of Financial Position, Balance [Axis] Statement [Table] Statement [Table] Proceeds from the issuance of warrants related to convertible senior notes Aggregate proceeds from sale of warrants Proceeds from Issuance of Warrants Restatement Determination Date: Restatement Determination Date [Axis] Schedule of Changes in Accumulated Other Comprehensive Loss Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Threshold consecutive trading days exceeding price Debt Instrument, Convertible, Threshold Consecutive Trading Days Cash and Cash Equivalents [Axis] Cash and Cash Equivalents [Axis] Collections from customers previously reserved and other Accounts Receivable, Allowance for Credit Loss, Recovery Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block]