Unaudited Condensed Consolidated Statement of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 27, 2015	Sep. 28, 2014	Sep. 27, 2015	Sep. 28, 2014
Net income	$ 15,099	$ 20,025	$ 26,777	$ 49,141
Other comprehensive income (loss), before tax:
Unrealized gain (loss) on derivative instruments	10	139	(102)	66
Unrealized gain on available-for-sale securities	6	2	34	25
Other comprehensive income (loss), before tax	16	141	(68)	91
Tax expense related to items of other comprehensive income	(2)	(1)	(13)	(10)
Other comprehensive income (loss), net of tax	14	140	(81)	81
Comprehensive income	$ 15,113	$ 20,165	$ 26,696	$ 49,222