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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

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