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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, 2016 | Dec. 31, 2015
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Deferred income tax assets (liabilities): |  |
Inventory costing and valuation methods | $ 4,788 | $ 4,556
Allowance for doubtful accounts | 4,339 | 4,529
Insurance reserves | 11,489 | 10,930
Promotions payable | 1,651 | 1,738
Stock-based compensation | 6,789 | 8,270
Federal and state benefit of uncertain tax positions | 1,908 | 1,911
Foreign net operating loss and credit carryforwards | 5,121 | 5,155
Foreign valuation allowances | (3,998) | (3,406)
Other, net | 2,123 | 1,541
Total deferred income tax assets | 34,210 | 35,224
Property and equipment | (114,838) | (90,281)
Total deferred income tax liabilities | (114,838) | (90,281)
Net deferred income tax liabilities | $ (80,628) | $ (55,057)

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