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Income Taxes (Details 3) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Deferred income tax assets: |  |
Self-insurance accruals | $ 52,177 | $ 37,296
Net operating loss carryforwards | 258,808 | 275,124
Alternative minimum taxes | 9,679 | 9,679
Accrued compensation and benefits | 61,095 | 67,323
Federal benefit on state tax positions | 17,925 | 18,847
Pension benefits | 204,069 | 179,159
Miscellaneous other accruals | 39,708 | 38,588
Deferred tax assets gross | 643,461 | 626,016
Valuation allowance | (38,182) | (41,324)
Deferred tax assets net | 605,279 | 584,692
Deferred income tax liabilities: |  |
Property and equipment bases difference | (1,734,508) | (1,649,494)
Other items | (18,716) | (25,265)
Deferred tax liabilities | (1,753,224) | (1,674,759)
Net deferred income tax liability | $ (1,147,945) | $ (1,090,067)

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