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Selected Quarterly Financial Data (Unaudited) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract]                      
Net sales $ 195,003us-gaap_SalesRevenueNet $ 174,961us-gaap_SalesRevenueNet $ 188,150us-gaap_SalesRevenueNet $ 181,941us-gaap_SalesRevenueNet $ 203,442us-gaap_SalesRevenueNet $ 179,255us-gaap_SalesRevenueNet $ 192,993us-gaap_SalesRevenueNet $ 187,014us-gaap_SalesRevenueNet $ 740,055us-gaap_SalesRevenueNet $ 762,704us-gaap_SalesRevenueNet $ 767,140us-gaap_SalesRevenueNet
Gross profit 104,033us-gaap_GrossProfit 96,414us-gaap_GrossProfit 101,028us-gaap_GrossProfit 102,582us-gaap_GrossProfit 111,395us-gaap_GrossProfit 95,424us-gaap_GrossProfit 102,916us-gaap_GrossProfit 102,682us-gaap_GrossProfit 404,057us-gaap_GrossProfit 412,417us-gaap_GrossProfit 405,843us-gaap_GrossProfit
Net income (loss) $ 11,339us-gaap_NetIncomeLoss $ 1,972us-gaap_NetIncomeLoss $ 10,255us-gaap_NetIncomeLoss $ 8,626us-gaap_NetIncomeLoss $ 10,227us-gaap_NetIncomeLoss $ 5,687us-gaap_NetIncomeLoss $ 9,533us-gaap_NetIncomeLoss $ 10,492us-gaap_NetIncomeLoss $ 32,192us-gaap_NetIncomeLoss $ 35,939us-gaap_NetIncomeLoss $ 40,481us-gaap_NetIncomeLoss
EPS:                      
Basic (per share) $ 0.41us-gaap_EarningsPerShareBasic $ 0.07us-gaap_EarningsPerShareBasic $ 0.38us-gaap_EarningsPerShareBasic $ 0.32us-gaap_EarningsPerShareBasic $ 0.37us-gaap_EarningsPerShareBasic $ 0.21us-gaap_EarningsPerShareBasic $ 0.35us-gaap_EarningsPerShareBasic $ 0.37us-gaap_EarningsPerShareBasic $ 1.17us-gaap_EarningsPerShareBasic $ 1.30us-gaap_EarningsPerShareBasic $ 1.43us-gaap_EarningsPerShareBasic
Diluted (per share) $ 0.41us-gaap_EarningsPerShareDiluted $ 0.07us-gaap_EarningsPerShareDiluted $ 0.37us-gaap_EarningsPerShareDiluted $ 0.31us-gaap_EarningsPerShareDiluted $ 0.36us-gaap_EarningsPerShareDiluted $ 0.20us-gaap_EarningsPerShareDiluted $ 0.34us-gaap_EarningsPerShareDiluted $ 0.37us-gaap_EarningsPerShareDiluted $ 1.16us-gaap_EarningsPerShareDiluted $ 1.28us-gaap_EarningsPerShareDiluted $ 1.41us-gaap_EarningsPerShareDiluted