Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 27, 2014	Sep. 28, 2013	Sep. 27, 2014	Sep. 28, 2013
Consolidated Statements of Comprehensive Income [Abstract]
Net income	$ 13,707	$ 11,692	$ 41,271	$ 56,000
Other comprehensive income (loss) by component, net of tax:
Unrealized holding gains (losses) arising during period (Net of deferred taxes of $5 and $85 respectively for the 13 Weeks Ended and $824 and $257 respectively for the 39 Weeks Ended)	14	(154)	1,182	(512)
Reclassification adjustment for gains included in net income (Net of deferred taxes of $0 and $162 respectively for the 13 Weeks Ended and $21 and $771 respectively for the 39 Weeks Ended)	0	(202)	(26)	(963)
Other comprehensive income (loss), net of tax	14	(356)	1,156	(1,475)
Comprehensive income, net of tax	$ 13,721	$ 11,336	$ 42,427	$ 54,525