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