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Income Taxes Deferred tax assets and liabilties (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
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Income Taxes [Abstract] |  |
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Allowance for Doubtful Accounts | $ 305 | $ 288
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities | 6,655 | 6,513
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost | 579 | 46
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Self Insurance | 27,549 | 27,677
Deferred Tax Assets, Unrealized Losses on Available-for-Sale Securities, Gross | 449 | 1,078
Deferred Tax Assets, Tax Deferred Expense | 5,658 | 5,767
Deferred Tax Assets, Other | 1,011 | 1,230
Deferred Tax Assets, Gross | 42,206 | 42,599
Deferred Tax Assets, Valuation Allowance | (449) | (1,078)
Deferred Tax Assets, Net | 41,757 | 41,521
Deferred Tax Liabilities, Property, Plant and Equipment | (77,177) | (82,897)
Deferred Tax Liabilities, Goodwill and Intangible Assets | (1,351) | (1,195)
Deferred Tax Liabilities, Deferred Expense | (738) | (689)
Deferred Income Tax Liabilities | (79,266) | (84,781)
Deferred Tax Assets (Liabilities), Net | $ (37,509) | $ (43,260)

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