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Quarterly Unaudited Financial Data (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 231,838 | $ 272,734 | $ 265,738 | $ 237,671 | $ 282,093 | $ 304,994 | $ 253,171 | $ 200,615 | $ 1,007,981 | $ 1,040,873 | $ 862,087
Gross profit | 53,882 | 67,887 | 68,843 | 54,150 | 51,546 | 61,396 | 44,119 | 29,915 | 244,762 | 186,976 | 140,045
Income (loss) from operations: | 584 | 26,363 | 28,416 | 17,601 | 4,520 | 23,394 | 11,201 | 8,970 | 72,964 | 48,085 | (70,417)
Interest expense | 3,595 | 3,625 | 3,666 | 3,691 | 3,614 | 3,878 | 3,811 | 3,700 | 14,577 | 15,003 | 14,421
Income (loss) from continuing operations | (7,708) | 13,786 | 18,612 | 9,029 | 220 | 13,632 | 4,087 | 5,537 | 33,719 | 23,476 | (81,792)
Loss from discontinued operations | (44) | 0 | 0 | 0 | 0 | 0 | 0 | (28) | (44) | (28) | (32)
Net income (loss) | $ (7,752) | $ 13,786 | $ 18,612 | $ 9,029 | $ 220 | $ 13,632 | $ 4,087 | $ 5,509 | $ 33,675 | $ 23,448 | $ (81,824)
(Loss) income per share from continuing operations: |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) | $ (0.24) | $ 0.44 | $ 0.59 | $ 0.29 | $ 0.01 | $ 0.44 | $ 0.13 | $ 0.18 | $ 1.07 | $ 0.75 | $ (2.63)
Diluted (in dollars per share) | (0.24) | 0.43 | 0.58 | 0.28 | 0.01 | 0.43 | 0.13 | 0.18 | 1.05 | 0.74 | (2.63)
Loss per share from discontinued operations: |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00
Diluted (in dollars per share) | $ 0.00 | $ 0.00 | $ 0.00 | $ 0.00 | $ 0.00 | $ 0.00 | $ 0.00 | $ 0.00 | $ 0.00 | $ 0.00 | $ 0.00
Discrete tax benefit |  |  |  |  |  |  |  |  | $ (16,264) | $ (13,624) | $ 2,958
Disposal Group, Not Discontinued Operations |  |  |  |  |  |  |  |  |  |  |
Loss per share from discontinued operations: |  |  |  |  |  |  |  |  |  |  |
Discrete tax benefit |  |  | $ 4,800 |  |  |  |  |  |  |  |

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