Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 27, 2014	Sep. 28, 2013	Sep. 27, 2014	Sep. 28, 2013
Income Statement [Abstract]
Net sales	$ 197,796	$ 177,953	$ 577,495	$ 494,657
Cost of goods sold	121,915	108,249	357,011	299,774
Gross profit	75,881	69,704	220,484	194,883
Selling, general and administrative expenses	37,405	34,034	108,361	98,551
Income from operations	38,476	35,670	112,123	96,332
Interest expense, net	58	47	160	148
Income before income taxes	38,418	35,623	111,963	96,184
Provision for income taxes	13,882	12,736	40,632	34,883
Net income	$ 24,536	$ 22,887	$ 71,331	$ 61,301
Earnings Per Share:
Basic	$ 0.68	$ 0.63	$ 1.97	$ 1.69
Diluted	$ 0.68	$ 0.62	$ 1.96	$ 1.67
Weighted Average Shares Outstanding:
Basic	35,898	36,362	36,217	36,343
Diluted	36,024	36,632	36,372	36,610