Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 28, 2014	Jun. 29, 2013	Jun. 28, 2014	Jun. 29, 2013
Consolidated Statements of Comprehensive Income [Abstract]
Net income	$ 12,798	$ 24,179	$ 27,564	$ 44,307
Other comprehensive income (loss) by component, net of tax:
Unrealized holding gains (losses) arising during period (Net of deferred taxes of $162 and $600 respectively for the 13 Weeks Ended and $819 and $173 respectively for the 26 Weeks Ended)	235	(964)	1,168	(358)
Reclassification adjustment for gains included in net income (Net of deferred taxes of $2 and $587 respectively for the 13 Weeks Ended and $20 and $608 respectively for the 26 Weeks Ended)	(3)	(735)	(26)	(761)
Other comprehensive income (loss), net of tax	232	(1,699)	1,142	(1,119)
Comprehensive income, net of tax	$ 13,030	$ 22,480	$ 28,706	$ 43,188