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Income Taxes (Schedule Of Deferred Tax Assets And Liabilities) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
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Income Tax Disclosure [Abstract] |  |
Insurance and claims accruals | $ 76,596 | $ 73,211
Allowance for uncollectible accounts | 5,672 | 7,813
Other | 8,437 | 9,416
Gross deferred tax assets | 90,705 | 90,440
Property and equipment | 282,642 | 288,032
Prepaid expenses | 6,906 | 6,774
Other | 3,079 | 3,026
Gross deferred tax liabilities | 292,627 | 297,832
Net deferred tax liability | $ 201,922 | $ 207,392

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