Income Taxes - Components of Deferred Income Tax Amounts (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Deferred income tax assets
Employee deferred compensation and other benefit obligations	$ 162,803	$ 137,501
Deferred revenues, foreign royalties and management fees	375	3,528
Credits and net operating loss carryforwards	28,137	24,782
Stock-based compensation	6,318	5,262
Allowance for credit losses	6,825	6,765
Workers’ compensation	3,052	3,207
Operating lease liabilities	48,358	46,145
Other	17,698	17,542
Total deferred income tax assets	273,566	244,732
Deferred income tax liabilities
Amortization of intangible assets	(20,162)	(20,465)
Property and equipment basis differences	(8,612)	(19,756)
Unrealized gains from investments held in employee deferred compensation trusts	(27,131)	(7,992)
Right-of-use assets	(38,837)	(37,618)
Other	(13,258)	(12,104)
Total deferred income tax liabilities	(108,000)	(97,935)
Valuation allowance	(25,772)	(23,571)
Total deferred income tax assets, net	$ 139,794	$ 123,226