Income Taxes - Components of Deferred Income Tax Amounts (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Deferred income tax assets
Employee deferred compensation and other benefit obligations	$ 155,064	$ 128,702
Deferred revenues, foreign royalties and management fees	16,034	0
Deferred Payroll Taxes (CARES Act)	13,355	27,086
Credits and net operating loss carryforwards	24,811	30,651
Stock-based compensation	3,843	3,637
Allowance for credit losses	6,557	5,272
Workers’ compensation	3,623	3,774
Operating lease liabilities	52,614	59,249
Other	18,565	13,361
Total deferred income tax assets	294,466	271,732
Deferred income tax liabilities
Amortization of intangible assets	(24,391)	(24,163)
Property and equipment basis differences	(23,305)	(25,555)
Unrealized gains from investments held in employee deferred compensation trusts	(34,001)	(26,224)
Right-of-use assets	(43,986)	(49,833)
Other	(10,549)	(8,922)
Total deferred income tax liabilities	(136,232)	(134,697)
Valuation allowance	(24,198)	(24,132)
Total deferred income tax assets, net	$ 134,036	$ 112,903