Basis of Presentation - Change in Accounting Policy - Statement of Operations (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Accounting Changes
Net sales	$ 157,779	$ 112,218	$ 316,353	$ 206,717
Cost of sales	102,384	76,371	204,278	136,371
Income tax expense (benefit)	(28,025)	(13,341)	(28,255)	(23,868)
Net income (loss)	$ (237,634)	$ (20,817)	$ (253,461)	$ (19,177)
Diluted earnings (loss) per (in dollars per share)	$ (5.02)	$ (0.49)	$ (5.35)	$ (0.47)
Previously Reported \| Accounting Standards Update 2014-09, Revenue from Contracts with Customers
Accounting Changes
Net sales		$ 115,066		$ 209,452
Cost of sales		76,346		136,533
Income tax expense (benefit)		(12,897)		(23,179)
Net income (loss)		$ (18,388)		$ (17,293)
Diluted earnings (loss) per (in dollars per share)		$ (0.43)		$ (0.42)
Adjustments for adoption of guidance \| Accounting Standards Update 2014-09, Revenue from Contracts with Customers
Accounting Changes
Net sales		$ (2,848)		$ (2,735)
Cost of sales		25		(162)
Income tax expense (benefit)		(444)		(689)
Net income (loss)		$ (2,429)		$ 1,884
Diluted earnings (loss) per (in dollars per share)		$ (0.06)		$ (0.05)

The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities.

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