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Selected Quarterly Financial Information (unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Quarterly Financial Information
Net sales	$ 98,972	$ 126,757	$ 157,779	$ 158,574	$ 139,661	$ 129,308	$ 112,218	$ 94,499	$ 542,082	$ 475,686	$ 331,702
Gross profit	35,259	46,385	55,395	56,680	55,352	50,529	35,847	34,500	193,719	176,228	133,098
Net income (loss)	$ (144,674)	$ (8,953)	$ (237,634)	$ (15,827)	$ (8,479)	$ (23,740)	$ (20,817)	$ 1,640	$ (407,088)	$ (51,396)	$ (122,027)
Basic income (loss) per common share (in dollars per share)	$ (3.11)	$ (0.19)	$ (5.02)	$ (0.34)	$ (0.18)	$ (0.51)	$ (0.49)	$ 0.04	$ (8.63)	$ (1.16)	$ (3.10)
Diluted earnings (loss) per share (in dollars per share)	$ (3.11)	$ (0.19)	$ (5.02)	$ (0.34)	$ (0.18)	$ (0.51)	$ (0.49)	$ 0.04	$ (8.63)	$ (1.16)	$ (3.10)

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