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Quarterly 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 Data |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 501,401 | $ 489,044 | $ 474,458 | $ 441,363 | $ 444,135 | $ 453,102 | $ 431,589 | $ 414,024 | $ 1,906,266 | $ 1,742,850 | $ 1,616,580
Gross profit | 122,033 | 120,839 | 116,609 | 101,628 | 105,062 | 108,139 | 97,688 | 89,455 | 461,109 | 400,344 | 358,029
Operating (loss) profit | 49,970 | 49,562 | 40,796 | (3,463) | 35,944 | 39,101 | 26,790 | 19,767 | 136,864 | 121,604 | 83,531
(Loss) income from continuing operations | 104,991 | 31,393 | 23,460 | (1,710) | 21,307 | 24,566 | 15,615 | 11,116 | 158,133 | 72,606 | 79,123
Net (loss) income | $ 104,991 | $ 31,393 | $ 23,460 | $ (1,710) | $ 21,307 | $ 24,566 | $ 15,615 | $ 11,116 | $ 158,133 | $ 72,606 | $ 78,971
Basic income per common share: |  |  |  |  |  |  |  |  |  |  |
(Loss) income from continuing operations | $ 3.00 | $ 0.90 | $ 0.64 | $ (0.05) | $ 0.57 | $ 0.65 | $ 0.41 | $ 0.29 | $ 4.41 | $ 1.93 | $ 2.10
Net income | 3.00 | 0.90 | 0.64 | (0.05) | 0.57 | 0.65 | 0.41 | 0.29 | 4.41 | 1.93 | 2.10
Diluted income per common share: |  |  |  |  |  |  |  |  |  |  |
(Loss) income from continuing operations | 2.93 | 0.88 | 0.63 | (0.05) | 0.57 | 0.65 | 0.41 | 0.29 | 4.32 | 1.92 | 2.09
Net income | $ 2.93 | $ 0.88 | $ 0.63 | $ (0.05) | $ 0.57 | $ 0.65 | $ 0.41 | $ 0.29 | $ 4.32 | $ 1.92 | $ 2.09

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