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Income Taxes (Summary Of Temporary Differences That Give Rise To Deferred Income Tax Assets And Liabilities) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
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Income Tax Expense (Benefit) [Abstract] |  |
Inventory costing and valuation methods | $ 4,045 | $ 4,643
Allowance for doubtful accounts receivable | 2,618 | 2,202
Insurance claims payable | 7,825 | 10,807
Promotions payable | 945 | 797
Accrued legal reserves | 207 | 39
Stock based compensation | 4,715 | 5,853
Federal and state benefit of uncertain tax positions | 1,871 | 1,632
Other, net | 267 | 920
Total deferred income tax assets | 22,493 | 26,893
Property and equipment | (59,371) | (48,329)
Total deferred income tax liabilities | (59,371) | (48,329)
Net deferred income tax asset (liability) | $ (36,878) | $ (21,436)

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