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Basis of Presentation - Change in Accounting Policy - Statement of Operations (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Accounting Changes |  |  |  |
Net sales | $ 126,757 | $ 129,308 | $ 443,110 | $ 336,025
Cost of sales | 80,372 | 78,779 | 284,651 | 215,150
Income tax expense (benefit) | 301 | (2,466) | (27,954) | (26,334)
Net income (loss) | $ (8,953) | $ (23,740) | $ (262,414) | $ (42,918)
Diluted earnings (loss) per share (in dollars per share) | $ (0.19) | $ (0.51) | $ (5.55) | $ (1.00)
Previously Reported | Accounting Standards Update 2014-09, Revenue from Contracts with Customers |  |  |  |
Accounting Changes |  |  |  |
Net sales |  | $ 131,872 |  | $ 341,324
Cost of sales |  | 78,811 |  | 215,344
Income tax expense (benefit) |  | (1,790) |  | (24,969)
Net income (loss) |  | $ (21,884) |  | $ (39,177)
Diluted earnings (loss) per share (in dollars per share) |  | $ (0.47) |  | $ (0.91)
Adjustments for adoption of guidance | Accounting Standards Update 2014-09, Revenue from Contracts with Customers |  |  |  |
Accounting Changes |  |  |  |
Net sales |  | $ (2,564) |  | $ (5,299)
Cost of sales |  | (32) |  | (194)
Income tax expense (benefit) |  | (676) |  | (1,365)
Net income (loss) |  | $ (1,856) |  | $ (3,741)
Diluted earnings (loss) per share (in dollars per share) |  | $ (0.04) |  | $ (0.09)

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