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Significant Accounting Policies - Recently Adopted Accounting Standards - Statement of Operations (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
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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
Accounting Changes |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 98,972 | $ 126,757 | $ 157,779 | $ 158,574 | $ 139,661 | $ 129,308 | $ 112,218 | $ 94,499 | $ 542,082 | $ 475,686 | $ 331,702
Cost of sales |  |  |  |  |  |  |  |  | 348,363 | 299,458 | 198,604
Income tax expense (benefit) |  |  |  |  |  |  |  |  | (26,746) | (37,594) | 2,823
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)
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)
Previously Reported | ASU 2014-09, Revenue from Contracts with Customers |  |  |  |  |  |  |  |  |  |  |
Accounting Changes |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  | $ 484,756 | $ 332,451
Cost of sales |  |  |  |  |  |  |  |  |  | 300,438 | 199,593
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  | (36,107) | 2,766
Net income (loss) |  |  |  |  |  |  |  |  |  | $ (44,793) | $ (122,210)
Diluted earnings (loss) per share (in dollars per share) |  |  |  |  |  |  |  |  |  | $ (1.01) | $ (3.11)
Adjustments for adoption of guidance | ASU 2014-09, Revenue from Contracts with Customers |  |  |  |  |  |  |  |  |  |  |
Accounting Changes |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  | $ (9,070) | $ (749)
Cost of sales |  |  |  |  |  |  |  |  |  | (980) | (989)
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  | (1,487) | 57
Net income (loss) |  |  |  |  |  |  |  |  |  | $ (6,603) | $ 183
Diluted earnings (loss) per share (in dollars per share) |  |  |  |  |  |  |  |  |  | $ (0.15) | $ 0.01

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