Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 26, 2015	Dec. 27, 2014
Net income	$ 137,350	$ 147,689	$ 138,809
Other comprehensive income (loss):
Unrealized holding gains (losses) on available-for-sale investments, net of tax (expense) benefit of ($13), $109 and $76	23	(199)	(139)
Foreign currency translation gains (losses)	376	(2,104)	(1,034)
Other comprehensive income (loss)	399	(2,303)	(1,173)
Comprehensive income	$ 137,749	$ 145,386	$ 137,636