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Fair Value of Financial Instruments - Narrative (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 18, 2019
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Amounts owed to employees participating in the deferred compensation plan | $ 2,400,000 | $ 2,800,000 |  |
Change in fair value of contingent consideration | 0 | 3,340,000 | $ 0 |
Revision of Prior Period, Reclassification, Adjustment |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Change in fair value of contingent consideration |  | (3,300,000) |  |
AccSys LLC (Restaurant Magic) |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Contingent consideration liability |  | 0 | $ 3,300,000 | $ 3,300,000
Change in fair value of contingent consideration |  | (3,300,000) |  |
Fair Value, Inputs, Level 2 | Convertible Debt | Convertible Senior Notes Due 2024 |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Fair value of notes | 27,200,000 | 30,600,000 |  |
Fair Value, Inputs, Level 2 | Convertible Debt | Convertible Senior Notes Due 2026 |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Fair value of notes | 175,500,000 | $ 195,400,000 |  |
Fair Value, Inputs, Level 2 | Convertible Debt | Convertible Senior Notes Due 2027 |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Fair value of notes | $ 267,500,000 |  |  |

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