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Quarterly Results (Unaudited) (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	$ 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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