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Selected Quarterly Financial Data (Unaudited) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]                      
Net sales $ 191,017 $ 169,184 $ 181,027 $ 177,940 $ 195,003 $ 174,961 $ 188,150 $ 181,941 $ 719,168 $ 740,055 $ 762,704
Gross profit 102,376 93,546 93,498 92,282 104,033 96,414 101,028 102,582 381,702 404,057 412,417
Net income $ 7,852 $ 8,873 $ 7,461 $ 6,312 $ 11,339 $ 1,972 $ 10,255 $ 8,626 $ 30,498 $ 32,192 $ 35,939
EPS:                      
Basic (in dollars per share) $ 0.28 $ 0.32 $ 0.27 $ 0.23 $ 0.41 $ 0.07 $ 0.38 $ 0.32 $ 1.10 $ 1.17 $ 1.30
Diluted (in dollars per share) $ 0.28 $ 0.32 $ 0.27 $ 0.23 $ 0.41 $ 0.07 $ 0.37 $ 0.31 $ 1.09 $ 1.16 $ 1.28