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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, 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 Data [Abstract]
Net sales	$ 433,847	$ 400,645	$ 388,802	$ 365,786	$ 339,836	$ 333,650	$ 326,754	$ 318,854	$ 1,589,080	$ 1,319,094	$ 1,949,857
Gross profit (loss)	47,892	41,402	22,460	16,851	5,057	(17,612)	5,582	(3,052)	128,605	(11,042)	41,313
Net income (loss)	35,805	20,783	7,131	(15,139)	(168,464)	(58,273)	(9,515)	(16,163)	48,580	$ (252,415)	$ (59,310)
Net income (loss) allocated to common stockholders	$ 32,963	$ 19,132	$ 6,563	$ (15,139)	$ (168,464)	$ (58,273)	$ (9,515)	$ (16,163)	$ 44,714
Basic earnings (loss) per share (in dollars per share)	$ 0.38	$ 0.22	$ 0.08	$ (0.17)	$ (1.93)	$ (0.67)	$ (0.11)	$ (0.19)	$ 0.51	$ (2.90)	$ (0.68)
Diluted earnings (loss) per share (in dollars per share)	$ 0.37	$ 0.22	$ 0.07	$ (0.17)	$ (1.93)	$ (0.67)	$ (0.11)	$ (0.19)	$ 0.51	$ (2.90)	$ (0.68)

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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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