Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 26, 2015	Sep. 27, 2014	Sep. 26, 2015	Sep. 27, 2014
Consolidated Statements of Comprehensive Income [Abstract]
Net income	$ 12,788	$ 13,511	$ 42,754	$ 40,682
Other comprehensive income (loss) by component, net of tax:
Unrealized holding gains (losses) arising during period (Net of deferred taxes of $168 and $5, respectively for the 13 Weeks Ended and $243 and $824, respectively for the 39 Weeks Ended)	(241)	14	(350)	1,182
Reclassification adjustment for gains included in net income (Net of deferred taxes of $7 and $21, respectively for the 39 Weeks Ended)	0	0	(8)	(26)
Other comprehensive income (loss), net of tax	(241)	14	(358)	1,156
Comprehensive income, net of tax	$ 12,547	$ 13,525	$ 42,396	$ 41,838