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Quarterly Financial Data (Unaudited) (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
Selected quarterly financial information [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 229,799 | $ 300,795 | $ 288,977 | $ 238,911 | $ 204,967 | $ 270,037 | $ 269,382 | $ 227,589 | $ 1,058,482 | $ 971,975 | $ 980,392
Gross profit | 66,771 | 95,644 | 87,076 | 72,996 | 62,786 | 81,553 | 72,760 | 63,889 | 322,487 | 280,988 | 289,630
Earnings from continuing operations | 8,839 | 21,055 | 19,862 | 12,656 | 5,779 | 19,194 | 13,808 | 9,339 | 62,412 | 48,120 | 52,899
Loss from discontinued operations, net of taxes | (487) | (425) | (618) | (452) | (553) | (728) | (430) | (391) | (1,982) | (2,102) | (9,870)
Net earnings | $ 8,352 | $ 20,630 | $ 19,244 | $ 12,204 | $ 5,226 | $ 18,466 | $ 13,378 | $ 8,948 | $ 60,430 | $ 46,018 | $ 43,029
Net earnings from continuing operations per common share [Abstract] |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) | $ 0.39 | $ 0.93 | $ 0.87 | $ 0.56 | $ 0.26 | $ 0.84 | $ 0.60 | $ 0.41 | $ 2.75 | $ 2.11 | $ 2.31
Diluted (in dollars per share) | 0.38 | 0.91 | 0.86 | 0.55 | 0.25 | 0.83 | 0.59 | 0.40 | 2.70 | 2.08 | 2.28
Net earnings per common share [Abstract] |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) | 0.37 | 0.91 | 0.85 | 0.54 | 0.23 | 0.81 | 0.58 | 0.39 | 2.66 | 2.02 | 1.88
Diluted (in dollars per share) | $ 0.36 | $ 0.89 | $ 0.84 | $ 0.53 | $ 0.23 | $ 0.80 | $ 0.58 | $ 0.39 | $ 2.62 | $ 1.99 | $ 1.85

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