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Quarterly Unaudited Financial Data (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 258,112 | $ 274,574 | $ 247,627 | $ 206,605 | $ 231,838 | $ 272,734 | $ 265,738 | $ 237,671 | $ 986,918 | $ 1,007,981 | $ 1,040,873
Gross profit | 56,729 | 68,735 | 61,825 | 49,255 | 53,882 | 67,887 | 68,843 | 54,150 | 236,544 | 244,762 | 186,976
Income (loss) from operations: | 22,547 | 35,693 | 24,930 | 9,679 | 629 | 26,522 | 28,576 | 17,761 | 92,849 | 73,488 | 48,732
Interest expense | 3,420 | 3,486 | 3,550 | 3,576 | 3,595 | 3,625 | 3,666 | 3,691 | 14,032 | 14,577 | 15,003
Income from continuing operations | 25,176 | 20,619 | 13,174 | 3,996 | (7,708) | 13,786 | 18,612 | 9,029 | 62,965 | 33,719 | 23,476
Loss from discontinued operations | 0 | 0 | (405) | 0 | (44) | 0 | 0 | 0 | (405) | (44) | (28)
Net income | $ 25,176 | $ 20,619 | $ 12,769 | $ 3,996 | $ (7,752) | $ 13,786 | $ 18,612 | $ 9,029 | $ 62,560 | $ 33,675 | $ 23,448
(Loss) income per share from continuing operations: |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) | $ 0.79 | $ 0.65 | $ 0.41 | $ 0.13 | $ (0.24) | $ 0.44 | $ 0.59 | $ 0.29 | $ 1.98 | $ 1.07 | $ 0.75
Diluted (in dollars per share) | 0.78 | 0.64 | 0.41 | 0.12 | (0.24) | 0.43 | 0.58 | 0.28 | 1.95 | 1.05 | 0.74
Loss per share from discontinued operations: |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) | 0.00 | 0.00 | (0.01) | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | (0.01) | 0.00 | 0.00
Diluted (in dollars per share) | $ 0.00 | $ 0.00 | $ (0.01) | $ 0.00 | $ 0.00 | $ 0.00 | $ 0.00 | $ 0.00 | $ (0.01) | $ 0.00 | $ 0.00

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