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Fair Value of Financial Instruments - Narrative (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Amounts owed to employees participating in the deferred compensation plan | $ 2,800,000 | $ 3,200,000 |
Contingent consideration liability | 0 |  |
Change in fair value of contingent consideration | 3,340,000 | 0 | $ 450,000
AccSys LLC (Restaurant Magic) |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Contingent consideration liability | 0 | 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 | 30,600,000 | $ 102,300,000 |
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 | $ 195,400,000 |  |

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