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Selected Quarterly Financial Information (unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Quarterly Financial Information
Net sales	$ 143,432	$ 131,872	$ 115,066	$ 94,386	$ 93,609	$ 85,482	$ 75,348	$ 78,011	$ 484,756	$ 332,451	$ 477,038
Gross Profit	58,337	53,061	38,720	34,200	36,008	33,455	31,439	31,956	184,318	132,858	177,241
Net income (loss)	$ (5,616)	$ (21,884)	$ (18,388)	$ 1,095	$ (4,998)	$ (69,598)	$ (32,082)	$ (15,533)	$ (44,793)	$ (122,210)	$ (31,978)
Basic income (loss) per common share	$ (0.12)	$ (0.47)	$ (0.43)	$ 0.03	$ (0.13)	$ (1.78)	$ (0.82)	$ (0.40)	$ (1.01)	$ (3.11)	$ (0.80)
Diluted income (loss) per common share	$ (0.12)	$ (0.47)	$ (0.43)	$ 0.03	$ (0.13)	$ (1.78)	$ (0.82)	$ (0.40)	$ (1.01)	$ (3.11)	$ (0.80)

X

- Definition

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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Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the 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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