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)	$ (13,977)	$ (15,211)	$ 19,160	$ (22,085)	$ (6,026)	$ (4,081)	$ (10,071)	$ (66,940)	$ (42,263)	$ 30,928
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

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

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