Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 29, 2014	Mar. 30, 2013
Income Statement [Abstract]
Net sales	$ 276,412	$ 258,237
Cost of sales	105,029	94,821
Gross profit	171,383	163,416
Operating expenses:
Sales and marketing	125,022	109,813
General and administrative	18,896	15,820
Research and development	1,663	2,556
Total operating expenses	145,581	128,189
Operating income	25,802	35,227
Other income, net	102	91
Income before income taxes	25,904	35,318
Income tax expense	8,912	11,847
Net income	$ 16,992	$ 23,471
Basic net income per share:
Net income per share – basic (in USD per share)	$ 0.31	$ 0.43
Weighted-average shares – basic (in shares)	54,113	55,095
Diluted net income per share:
Net income per share – diluted (in USD per share)	$ 0.31	$ 0.42
Weighted-average shares – diluted (in shares)	54,844	56,251