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Quarterly Results (Unaudited) (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 | $ 104,160 | $ 113,668 | $ 101,326 | $ 86,078 | $ 91,668 | $ 104,568 | $ 102,319 | $ 85,422 | $ 405,232 | $ 383,977 | $ 358,632
Gross profit | 31,075 | 35,658 | 31,678 | 24,986 | 26,510 | 33,092 | 32,747 | 25,731 | 123,397 | 118,080 | 108,681
Net income | $ 15,770 | $ 14,717 | $ 13,794 | $ 10,217 | $ 11,420 | $ 15,682 | $ 14,725 | $ 11,551 | $ 54,498 | $ 53,376 | $ 45,728
Earnings per share: |  |  |  |  |  |  |  |  |  |  |
Basic (usd per share) | $ 0.30 | $ 0.28 | $ 0.26 | $ 0.19 | $ 0.22 | $ 0.30 | $ 0.28 | $ 0.22 | $ 1.04 | $ 1.01 | $ 0.85
Diluted (usd per share) | $ 0.30 | $ 0.28 | $ 0.26 | $ 0.19 | $ 0.21 | $ 0.29 | $ 0.27 | $ 0.22 | $ 1.03 | $ 1.00 | $ 0.84

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