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Income Taxes - Summary of significant components of deferred tax assets and liabilities (Details 2) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Deferred tax assets: |  |
Self-insurance | $ 5,907 | $ 7,274
Pension | 11,995 | 12,048
State net operating loss carryforwards | 1,455 | 370
Bad debt | 991 | 4,041
Accrued payroll | 857 | 1,330
Stock-based compensation | 5,847 | 5,885
All others | 2,483 | 4,704
Valuation allowance | (356) | (276)
Gross deferred tax assets | 29,179 | 35,376
Deferred tax liabilities: |  |
Depreciation | (95,606) | (137,606)
Goodwill amortization | (9,340) | (8,887)
Basis differences in variable interest entities | (5,281) | (4,876)
Basis differences in joint ventures | (396) | 518
All others | (22) | (20)
Gross deferred tax liabilities | (110,645) | (150,871)
Net deferred tax liabilities | $ (81,466) | $ (115,495)

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