Quarterly Results of Operations (Unaudited) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 28, 2013	Jun. 29, 2013	Mar. 30, 2013	Dec. 31, 2012	Sep. 29, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Quarterly Results of Operations (Unaudited) [Abstract]
Total net sales	$ 181,901	$ 170,942	$ 179,528	$ 155,905	$ 141,766	$ 118,152	$ 119,569	$ 112,337	$ 688,276	$ 491,824	$ 328,816
Gross profit	63,632	62,940	70,724	61,309	49,461	42,565	45,134	41,793	258,605	178,953	111,758
Net income	$ 26,575	$ 28,671	$ 32,308	$ 23,718	$ 19,786	$ 17,349	$ 18,014	$ 15,480	$ 111,272	$ 70,629	$ 40,015
Basic Earnings Per Share	$ 1.37	$ 1.48	$ 1.67	$ 1.23	$ 1.03	$ 0.91	$ 0.94	$ 0.81	$ 5.76	$ 3.69	$ 2.12
Diluted earnings per share	$ 1.33	$ 1.44	$ 1.63	$ 1.20	$ 1.00	$ 0.88	$ 0.91	$ 0.79	$ 5.58	$ 3.60	$ 2.09