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Income Taxes - Components of Deferred Income Tax Amounts (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Deferred Income Tax Assets |  |
Provision for bad debts | $ 6,794 | $ 10,510
Deferred compensation and other benefit obligations | 68,101 | 112,811
Workers’ compensation | 3,127 | 5,634
Stock-based compensation | 8,614 | 16,772
Credits and net operating loss carryforwards | 30,087 | 30,534
Other | 13,343 | 18,116
Total deferred income tax assets | 130,066 | 194,377
Deferred Income Tax Liabilities |  |
Amortization of intangible assets | (20,220) | (28,681)
Property and equipment basis differences | (4,421) | (16,640)
Other | (10,847) | (11,658)
Total deferred income tax liabilities | (35,488) | (56,979)
Valuation allowance | (20,178) | (18,907)
Total deferred income tax assets, net | $ 74,400 | $ 118,491

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