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Income Taxes - Summary of significant components of deferred tax assets and liabilities (Details 2) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Deferred tax assets: |  |
Self-insurance | $ 7,274 | $ 7,675
Pension | 12,048 | 12,555
State net operating loss carry forwards | 370 | 451
Bad debts | 4,041 | 5,755
Accrued payroll | 1,330 | 2,833
Stock-based compensation | 5,885 | 5,583
All others | 4,704 | 2,121
Valuation allowance | (276) | (2)
Gross deferred tax assets | 35,376 | 36,971
Deferred tax liabilities: |  |
Depreciation | (137,606) | (172,813)
Goodwill amortization | (8,887) | (7,974)
All others | (4,378) | (3,739)
Gross deferred tax liabilities | (150,871) | (184,526)
Net deferred tax liabilities | $ (115,495) | $ (147,555)

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