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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
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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 | $ 195,003 us-gaap_SalesRevenueNet | $ 174,961 us-gaap_SalesRevenueNet | $ 188,150 us-gaap_SalesRevenueNet | $ 181,941 us-gaap_SalesRevenueNet | $ 203,442 us-gaap_SalesRevenueNet | $ 179,255 us-gaap_SalesRevenueNet | $ 192,993 us-gaap_SalesRevenueNet | $ 187,014 us-gaap_SalesRevenueNet | $ 740,055 us-gaap_SalesRevenueNet | $ 762,704 us-gaap_SalesRevenueNet | $ 767,140 us-gaap_SalesRevenueNet
Gross profit | 104,033 us-gaap_GrossProfit | 96,414 us-gaap_GrossProfit | 101,028 us-gaap_GrossProfit | 102,582 us-gaap_GrossProfit | 111,395 us-gaap_GrossProfit | 95,424 us-gaap_GrossProfit | 102,916 us-gaap_GrossProfit | 102,682 us-gaap_GrossProfit | 404,057 us-gaap_GrossProfit | 412,417 us-gaap_GrossProfit | 405,843 us-gaap_GrossProfit
Net income (loss) | $ 11,339 us-gaap_NetIncomeLoss | $ 1,972 us-gaap_NetIncomeLoss | $ 10,255 us-gaap_NetIncomeLoss | $ 8,626 us-gaap_NetIncomeLoss | $ 10,227 us-gaap_NetIncomeLoss | $ 5,687 us-gaap_NetIncomeLoss | $ 9,533 us-gaap_NetIncomeLoss | $ 10,492 us-gaap_NetIncomeLoss | $ 32,192 us-gaap_NetIncomeLoss | $ 35,939 us-gaap_NetIncomeLoss | $ 40,481 us-gaap_NetIncomeLoss
EPS: |  |  |  |  |  |  |  |  |  |  |
Basic (per share) | $ 0.41 us-gaap_EarningsPerShareBasic | $ 0.07 us-gaap_EarningsPerShareBasic | $ 0.38 us-gaap_EarningsPerShareBasic | $ 0.32 us-gaap_EarningsPerShareBasic | $ 0.37 us-gaap_EarningsPerShareBasic | $ 0.21 us-gaap_EarningsPerShareBasic | $ 0.35 us-gaap_EarningsPerShareBasic | $ 0.37 us-gaap_EarningsPerShareBasic | $ 1.17 us-gaap_EarningsPerShareBasic | $ 1.30 us-gaap_EarningsPerShareBasic | $ 1.43 us-gaap_EarningsPerShareBasic
Diluted (per share) | $ 0.41 us-gaap_EarningsPerShareDiluted | $ 0.07 us-gaap_EarningsPerShareDiluted | $ 0.37 us-gaap_EarningsPerShareDiluted | $ 0.31 us-gaap_EarningsPerShareDiluted | $ 0.36 us-gaap_EarningsPerShareDiluted | $ 0.20 us-gaap_EarningsPerShareDiluted | $ 0.34 us-gaap_EarningsPerShareDiluted | $ 0.37 us-gaap_EarningsPerShareDiluted | $ 1.16 us-gaap_EarningsPerShareDiluted | $ 1.28 us-gaap_EarningsPerShareDiluted | $ 1.41 us-gaap_EarningsPerShareDiluted

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