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Interim Financial Information (Schedule Of Quarterly Financial Information) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 28, 2014
Jun. 29, 2014
Mar. 30, 2014
Dec. 31, 2013
Sep. 29, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Interim Financial Information [Abstract]                      
Net Sales $ 142,034us-gaap_SalesRevenueNet $ 95,463us-gaap_SalesRevenueNet $ 88,312us-gaap_SalesRevenueNet $ 86,554us-gaap_SalesRevenueNet $ 134,990us-gaap_SalesRevenueNet $ 100,612us-gaap_SalesRevenueNet $ 101,396us-gaap_SalesRevenueNet $ 83,190us-gaap_SalesRevenueNet $ 412,363us-gaap_SalesRevenueNet $ 420,188us-gaap_SalesRevenueNet $ 472,490us-gaap_SalesRevenueNet
Gross Profit 29,174us-gaap_GrossProfit 16,165us-gaap_GrossProfit 16,142us-gaap_GrossProfit 15,720us-gaap_GrossProfit 25,082us-gaap_GrossProfit 19,650us-gaap_GrossProfit 18,411us-gaap_GrossProfit 16,209us-gaap_GrossProfit 77,201us-gaap_GrossProfit 79,352us-gaap_GrossProfit 94,863us-gaap_GrossProfit
Net Earnings $ 12,493us-gaap_NetIncomeLoss $ 5,123us-gaap_NetIncomeLoss $ 4,171us-gaap_NetIncomeLoss $ 4,690us-gaap_NetIncomeLoss $ 17,082us-gaap_NetIncomeLoss $ 9,015us-gaap_NetIncomeLoss $ 8,301us-gaap_NetIncomeLoss $ 6,854us-gaap_NetIncomeLoss $ 26,477us-gaap_NetIncomeLoss $ 41,252us-gaap_NetIncomeLoss $ 38,875us-gaap_NetIncomeLoss
Earnings Per Share, Basic and Diluted $ 1.80us-gaap_EarningsPerShareBasicAndDiluted $ 0.74us-gaap_EarningsPerShareBasicAndDiluted $ 0.60us-gaap_EarningsPerShareBasicAndDiluted $ 0.68us-gaap_EarningsPerShareBasicAndDiluted $ 2.47us-gaap_EarningsPerShareBasicAndDiluted $ 1.31us-gaap_EarningsPerShareBasicAndDiluted $ 1.20us-gaap_EarningsPerShareBasicAndDiluted $ 0.99us-gaap_EarningsPerShareBasicAndDiluted $ 3.82us-gaap_EarningsPerShareBasicAndDiluted $ 5.97us-gaap_EarningsPerShareBasicAndDiluted $ 5.64us-gaap_EarningsPerShareBasicAndDiluted