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Income Taxes - Summary of significant components of deferred tax assets and liabilities (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Deferred tax assets: |  |
Self-insurance | $ 7,247 | $ 7,417
Pension | 8,018 | 9,688
State net operating loss carryforwards | 484 | 1,165
Bad debts | 4,748 | 3,489
Accrued payroll | 2,019 | 2,038
Stock-based compensation | 5,183 | 4,567
Tangible property regulations 481(a) | 7,665 |
All others | 1,541 | 274
Valuation allowance | (83) | (1,003)
Gross deferred tax assets | 36,822 | 27,635
Deferred tax liabilities: |  |
Depreciation | (165,960) | (168,717)
Goodwill amortization | (7,094) | (6,394)
All Others | (2,759) | (1,754)
Gross deferred tax liabilities | (175,813) | (176,865)
Net deferred tax liabilities | $ (138,991) | $ (149,230)

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