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Selected Quarterly Financial Information (unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Quarterly Financial Information
Net sales	$ 113,202	$ 108,954	$ 97,822	$ 99,371	$ 98,972	$ 126,757	$ 157,779	$ 158,574	$ 419,349	$ 542,082	$ 475,686
Gross profit	44,970	42,223	36,285	34,716	35,259	46,385	55,395	56,680	158,194	193,719	176,228
Net income (loss)	$ (32,871)	$ (11,767)	$ (15,565)	$ (18,530)	$ (144,674)	$ (8,953)	$ (237,634)	$ (15,827)	$ (78,733)	$ (407,088)	$ (51,396)
Basic income (loss) per common share (in dollars per share)	$ (0.69)	$ (0.25)	$ (0.33)	$ (0.40)	$ (3.11)	$ (0.19)	$ (5.02)	$ (0.34)	$ (1.66)	$ (8.63)	$ (1.16)
Diluted earnings (loss) per share (in dollars per share)	$ (0.69)	$ (0.25)	$ (0.33)	$ (0.40)	$ (3.11)	$ (0.19)	$ (5.02)	$ (0.34)	$ (1.66)	$ (8.63)	$ (1.16)

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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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