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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, 2012 | Dec. 31, 2011
--- | --- | ---
Deferred tax assets: |  |
Self-insurance | $ 7,417 | $ 6,344
Pension | 9,688 | 8,922
State net operating loss carry forwards | 1,165 | 1,671
Bad debts | 3,489 | 3,044
Accrued payroll | 2,038 | 2,099
Stock-based compensation | 4,567 | 3,680
All others | 274 | 1
Valuation allowance | (1,003) | (1,295)
Gross deferred tax assets | 27,635 | 24,466
Deferred tax liabilities: |  |
Depreciation | (168,717) | (166,190)
Goodwill amortization | (6,394) | (5,707)
All others | (1,754) | (1,314)
Gross deferred tax liabilities | (176,865) | (173,211)
Net deferred tax liabilities | $ (149,230) | $ (148,745)

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