Quarterly Results Of Operations (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Oct. 01, 2011	Jul. 02, 2011	Apr. 02, 2011	Dec. 31, 2010	Oct. 02, 2010	Jul. 03, 2010	Apr. 03, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Quarterly Results Of Operations [Abstract]
Sales	$ 77,080	$ 64,807	$ 59,711	$ 52,566	$ 58,515	$ 45,286	$ 45,705	$ 42,269	$ 254,164	$ 191,775	$ 147,703
Gross profit	43,512	36,389	33,516	30,272	34,536	26,383	27,088	25,391	143,689	113,398	80,708
Net income (loss)	$ 9,472	$ 6,429	$ 4,233	$ 3,243	$ 4,839	$ 2,328	$ 1,837	$ 2,064	$ 23,377	$ 11,068	$ (10,582)
Basic EPS, Amount	$ 0.57	$ 0.39	$ 0.26	$ 0.20	$ 0.30	$ 0.14	$ 0.11	$ 0.13	$ 1.42	$ 0.69	$ (0.66)
Diluted EPS, Amount	$ 0.56	$ 0.38	$ 0.25	$ 0.20	$ 0.29	$ 0.14	$ 0.11	$ 0.13	$ 1.39	$ 0.68	$ (0.66)