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Income Taxes (Summary Of Temporary Differences That Give Rise To Deferred Income Tax Assets And Liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
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Income Tax Disclosure [Abstract] |  |
Inventory costing and valuation methods | $ 4,556 | $ 4,311
Allowance for doubtful accounts receivable | 4,529 | 4,873
Insurance claims payable | 10,930 | 10,404
Promotions payable | 1,738 | 1,586
Stock-based compensation | 8,270 | 7,837
Federal and state benefit of uncertain tax positions | 1,911 | 1,327
Foreign net operating loss and credit carryforwards | 5,155 | 5,768
Foreign valuation allowances | (3,406) | (3,007)
Other, net | 1,541 | 592
Total deferred income tax assets | 35,224 | 33,691
Property and equipment | (90,281) | (80,458)
Total deferred income tax liabilities | (90,281) | (80,458)
Net deferred income tax liabilities | $ (55,057) | $ (46,767)

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