Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 26, 2016	Mar. 28, 2015
Consolidated Statements of Comprehensive Income [Abstract]
Net income	$ 20,129	$ 13,323
Other comprehensive income by component, net of tax:
Unrealized holding gains arising during period (Net of deferred taxes of $570 and $13, respectively)	816	18
Reclassification adjustment for gains included in net income (Net of deferred taxes of $111 and $3, respectively)	(158)	(3)
Other comprehensive income, net of tax	658	15
Comprehensive income, net of tax	$ 20,787	$ 13,338