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Quarterly information (Unaudited) - Financial Results by Quarter (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Quarterly Financial Data [Abstract]
Net sales	$ 339,836	$ 333,650	$ 326,754	$ 318,854	$ 383,915	$ 454,540	$ 523,491	$ 587,911	$ 1,319,094	$ 1,949,857	$ 1,931,042
Gross profit (loss)	5,057	(17,612)	5,582	(3,052)	(18,701)	(42,423)	8,342	94,095	(11,042)	41,313	201,799
Net income (loss)	(168,464)	(58,273)	(9,515)	(16,163)	(43,080)	(56,112)	(33,897)	73,779	$ (252,415)	$ (59,310)	126,474
Net income (loss) allocated to common stockholders	$ (168,464)	$ (58,273)	$ (9,515)	$ (16,163)	$ (43,080)	$ (56,112)	$ (33,897)	$ 67,813			$ 116,116
Basic earnings (loss) per share (in dollars per share)	$ (1.93)	$ (0.67)	$ (0.11)	$ (0.19)	$ (0.50)	$ (0.65)	$ (0.39)	$ 0.76	$ (2.90)	$ (0.68)	$ 1.31
Diluted earnings (loss) per share (in dollars per share)	$ (1.93)	$ (0.67)	$ (0.11)	$ (0.19)	$ (0.50)	$ (0.65)	$ (0.39)	$ 0.76	$ (2.90)	$ (0.68)	$ 1.30

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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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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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