Quarterly Results (Unaudited) (Details) $ / shares in Units, $ in Thousands			3 Months Ended								12 Months Ended
	Jul. 16, 2014	Jul. 02, 2013	Dec. 31, 2015 USD ($) $ / shares	Sep. 30, 2015 USD ($) $ / shares	Jun. 30, 2015 USD ($) $ / shares	Mar. 31, 2015 USD ($) $ / shares	Dec. 31, 2014 USD ($) $ / shares	Sep. 30, 2014 USD ($) $ / shares	Jun. 30, 2014 USD ($) $ / shares	Mar. 31, 2014 USD ($) $ / shares	Dec. 31, 2015 USD ($) $ / shares	Dec. 31, 2014 USD ($) $ / shares	Dec. 31, 2013 USD ($) $ / shares
Quarterly Financial Information Disclosure [Abstract]
Net sales			$ 97,229	$ 94,360	$ 90,275	$ 76,768	$ 84,728	$ 102,917	$ 92,310	$ 76,367	$ 358,632	$ 356,322	$ 321,140
Gross profit			29,581	30,185	27,117	21,798	25,191	33,350	27,876	21,846	108,681	108,263	89,792
Net income			$ 12,948	$ 13,251	$ 11,130	$ 8,399	$ 10,533	$ 12,440	$ 11,363	$ 9,822	$ 45,728	$ 44,158	$ 37,547
Earnings per share:
Basic (usd per share) | $ / shares			$ 0.24	$ 0.24	$ 0.21	$ 0.16	$ 0.19	$ 0.23	$ 0.21	$ 0.18	$ 0.85	$ 0.81	$ 0.68
Diluted (usd per share) | $ / shares			$ 0.24	$ 0.24	$ 0.20	$ 0.15	$ 0.19	$ 0.22	$ 0.20	$ 0.17	$ 0.84	$ 0.80	$ 0.68
Stock split, conversion ratio	1.5	1.5