Unaudited Condensed Consolidated Statement of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 28, 2014	Sep. 29, 2013	Sep. 28, 2014	Sep. 29, 2013
Net income	$ 20,025	$ 14,457	$ 49,141	$ 43,785
Other comprehensive income (loss), before tax:
Unrealized gain (loss) on derivative instruments	139	(215)	66	(146)
Unrealized gain (loss) on available-for-sale securities	2	26	25	(15)
Other comprehensive income (loss), before tax	141	(189)	91	(161)
Tax (expense) benefit related to items of other comprehensive income	(1)	(10)	(10)	6
Other comprehensive income (loss), net of tax	140	(199)	81	(155)
Comprehensive income	$ 20,165	$ 14,258	$ 49,222	$ 43,630