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Income Taxes - Components of Deferred Income Tax Amounts (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Deferred Income Tax Assets |  |
Deferred compensation and other benefit obligations | $ 87,513 | $ 68,101
Credits and net operating loss carryforwards | 31,169 | 30,087
Stock-based compensation | 9,535 | 8,614
Provision for bad debts | 7,891 | 6,794
Workers’ compensation | 3,580 | 3,127
Other | 14,959 | 13,343
Total deferred income tax assets | 154,647 | 130,066
Deferred Income Tax Liabilities |  |
Amortization of intangible assets | (21,210) | (20,220)
Property and equipment basis differences | (9,761) | (4,421)
Other | (10,319) | (10,847)
Total deferred income tax liabilities | (41,290) | (35,488)
Valuation allowance | (23,072) | (20,178)
Total deferred income tax assets, net | $ 90,285 | $ 74,400

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