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Quarterly Results of Operations (Unaudited) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 29, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Oct. 01, 2011
Jul. 02, 2011
Apr. 02, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Quarterly Results of Operations (Unaudited) [Abstract]                      
Net Sales $ 141,766 $ 118,152 $ 119,569 $ 112,337 $ 93,241 $ 80,512 $ 79,622 $ 75,441 $ 491,824 $ 328,816 $ 255,206
Gross profit 49,461 42,565 45,134 41,793 30,172 29,127 28,465 23,995 178,953 111,758 83,982
Net income $ 19,786 $ 17,349 $ 18,014 $ 15,480 $ 10,518 $ 10,737 $ 10,813 $ 7,947 $ 70,629 $ 40,015 $ 28,255
Basic earnings per share $ 1.03 $ 0.91 $ 0.94 $ 0.81 $ 0.55 $ 0.57 $ 0.57 $ 0.42 $ 3.69 $ 2.12 $ 1.48
Diluted earnings per share $ 1.0 $ 0.88 $ 0.91 $ 0.79 $ 0.54 $ 0.56 $ 0.56 $ 0.42 $ 3.6 $ 2.09 $ 1.46