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Selected Quarterly Financial Information (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 |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 113,569us-gaap_SalesRevenueNet | $ 93,341us-gaap_SalesRevenueNet | $ 95,122us-gaap_SalesRevenueNet | $ 90,841us-gaap_SalesRevenueNet | $ 73,209us-gaap_SalesRevenueNet | $ 99,324us-gaap_SalesRevenueNet | $ 97,435us-gaap_SalesRevenueNet | $ 61,781us-gaap_SalesRevenueNet | $ 392,873us-gaap_SalesRevenueNet | $ 331,749us-gaap_SalesRevenueNet | $ 516,020us-gaap_SalesRevenueNet
Gross Profit | 37,874us-gaap_GrossProfit | 32,558us-gaap_GrossProfit | 30,673us-gaap_GrossProfit | 33,777us-gaap_GrossProfit | 15,642us-gaap_GrossProfit | 30,308us-gaap_GrossProfit | 34,640us-gaap_GrossProfit | 22,552us-gaap_GrossProfit | 134,882us-gaap_GrossProfit | 103,142us-gaap_GrossProfit | 215,133us-gaap_GrossProfit
Net income (loss) | $ (56,912)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ (13,977)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ (15,211)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 19,160us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ (22,085)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ (6,026)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ (4,081)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ (10,071)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ (66,940)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ (42,263)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 30,928us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Basic income (loss) per common share | $ (1.44)us-gaap_EarningsPerShareBasic | $ (0.35)us-gaap_EarningsPerShareBasic | $ (0.39)us-gaap_EarningsPerShareBasic | $ 0.49us-gaap_EarningsPerShareBasic | $ (0.57)us-gaap_EarningsPerShareBasic | $ (0.16)us-gaap_EarningsPerShareBasic | $ (0.11)us-gaap_EarningsPerShareBasic | $ (0.26)us-gaap_EarningsPerShareBasic | $ (1.70)us-gaap_EarningsPerShareBasic | $ (1.09)us-gaap_EarningsPerShareBasic | $ 0.80us-gaap_EarningsPerShareBasic
Diluted income (loss) per common share | $ (1.44)us-gaap_EarningsPerShareDiluted | $ (0.35)us-gaap_EarningsPerShareDiluted | $ (0.39)us-gaap_EarningsPerShareDiluted | $ 0.48us-gaap_EarningsPerShareDiluted | $ (0.57)us-gaap_EarningsPerShareDiluted | $ (0.16)us-gaap_EarningsPerShareDiluted | $ (0.11)us-gaap_EarningsPerShareDiluted | $ (0.26)us-gaap_EarningsPerShareDiluted | $ (1.70)us-gaap_EarningsPerShareDiluted | $ (1.09)us-gaap_EarningsPerShareDiluted | $ 0.79us-gaap_EarningsPerShareDiluted

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