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Income Taxes - Components of Deferred Income Tax Amounts (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred Income Tax Assets |  |
Employee deferred compensation and other benefit obligations | $ 102,478 | $ 105,096
Deferred Payroll Taxes (CARES Act) | 27,086 | 0
Credits and net operating loss carryforwards | 30,651 | 25,130
Stock-based compensation | 3,637 | 7,805
Allowance for credit losses | 5,272 | 7,944
Employee deferred compensation plan obligations | 3,774 | 3,929
Operating lease liabilities | 59,249 | 51,932
Other | 13,361 | 10,256
Total deferred income tax assets | 245,508 | 212,092
Deferred Income Tax Liabilities |  |
Amortization of intangible assets | (24,163) | (22,009)
Property and equipment basis differences | (25,555) | (16,981)
Right-of-use assets | (49,833) | (44,448)
Other | (8,922) | (7,278)
Total deferred income tax liabilities | (108,473) | (90,716)
Valuation allowance | (24,132) | (21,618)
Total deferred income tax assets, net | $ 112,903 | $ 99,758

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