Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Amounts owed to employees participating in the deferred compensation plan	$ 3,000		$ 3,000		$ 3,200
Contingent consideration liability	1,000		1,000
Adjustment to contingent consideration liability	2,310	$ 0	2,310	$ 0
Obligations
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period			3,340
New level 3 liability			0
Total gains reported in earnings			2,310
Settlement of Level 3 liabilities			0
Balance at end of period	1,030		1,030
Restaurant Magic
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Contingent consideration liability	1,000		1,000		$ 3,300
Adjustment to contingent consideration liability	2,300
Fair Value, Inputs, Level 2 | Convertible Notes | Convertible Senior Notes due 2024
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value of debt	20,700		20,700
Fair Value, Inputs, Level 2 | Convertible Notes | Convertible Senior Notes Due 2026
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value of debt	$ 144,700		$ 144,700