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Quarterly Results of Operations (Unaudited) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]                      
Net sales $ 157,715 $ 156,975 $ 151,071 $ 138,077 $ 138,404 $ 136,086 $ 138,082 $ 129,577 $ 603,838 $ 542,149 $ 509,689
Gross profit 70,256 67,815 66,854 60,100 60,307 59,205 60,886 55,383 265,025 235,781 225,222
Income from operations 12,602 2,987 11,581 7,706 8,050 8,547 12,242 8,704 25,386 31,200 31,572
Income tax expense 2,116 (978) 2,572 1,555 145 1,842 3,122 2,289 5,265 7,398 8,598
Net income $ 7,507 $ 973 $ 7,290 $ 4,351 $ 6,409 $ 4,818 $ 7,401 $ 5,174 $ 20,121 $ 23,802 $ 22,974
Basic (in dollars per share) $ 0.17 $ 0.02 $ 0.16 $ 0.10 $ 0.14 $ 0.11 $ 0.17 $ 0.12 $ 0.45 $ 0.54 $ 0.53
Diluted (in dollars per share) $ 0.17 $ 0.02 $ 0.16 $ 0.10 $ 0.14 $ 0.11 $ 0.17 $ 0.12 $ 0.45 $ 0.53 $ 0.53