Basis of Presentation - Change in Accounting Policy - Statement of Operations (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Accounting Changes
Net sales	$ 158,574	$ 94,499
Cost of sales	101,894	59,999
Income tax expense (benefit)	(230)	(10,527)
Net income (loss)	$ (15,827)	$ 1,640
Diluted (in dollars per share)	$ (0.34)	$ 0.04
Previously Reported | Accounting Standards Update 2014-09-09, Revenue from Contracts with Customers
Accounting Changes
Net sales		$ 94,386
Cost of sales		60,186
Income tax expense (benefit)		(10,282)
Net income (loss)		$ 1,095
Diluted (in dollars per share)		$ 0.03
Adjustments for adoption of guidance | Accounting Standards Update 2014-09-09, Revenue from Contracts with Customers
Accounting Changes
Net sales		$ 113
Cost of sales		(187)
Income tax expense (benefit)		(245)
Net income (loss)		$ 545
Diluted (in dollars per share)		$ 0.01