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Income Taxes (Schedule Of Deferred Tax Assets And Liabilities) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
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Income Tax Disclosure [Abstract] |  |
Insurance and claims accruals | $ 73,211 | $ 72,613
Allowance for uncollectible accounts | 7,813 | 6,913
Other | 9,416 | 8,382
Gross deferred tax assets | 90,440 | 87,908
Property and equipment | 288,032 | 295,429
Prepaid expenses | 6,774 | 6,710
Other | 3,026 | 2,964
Gross deferred tax liabilities | 297,832 | 305,103
Net deferred tax liability | $ 207,392 | $ 217,195

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