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Quarterly Results of Operations (UNAUDITED) (Results of Operations) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
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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 | $ 209,008 | $ 206,783 | $ 201,424 | $ 203,828 | $ 173,000 | $ 165,259 | $ 157,489 | $ 160,566 | $ 821,043 | $ 656,314 | $ 641,443
Gross margin | 75,491 | 82,188 | 80,546 | 80,350 | 66,849 | 61,929 | 60,199 | 60,508 | $ 318,575 | $ 249,485 | $ 235,362
Income (loss) from continuing operations | $ 6,999 | $ 25,532 | $ 20,896 | $ 27,032 | $ 11,913 | $ 16,065 | $ 5,377 | $ 14,928 |  |  |
Net income per share: |  |  |  |  |  |  |  |  |  |  |
Basic income from continuing operations (in dollars per share) | $ 0.38 | $ 1.40 | $ 1.15 | $ 1.50 | $ 0.66 | $ 0.89 | $ 0.30 | $ 0.83 |  |  |
Diluted income from continuing operations (in dollars per share) | $ 0.37 | $ 1.37 | $ 1.13 | $ 1.47 | $ 0.65 | $ 0.88 | $ 0.29 | $ 0.82 |  |  |

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