Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 26, 2011
Consolidated Statements of Comprehensive Income
Net income	$ 20,026	$ 18,601
Other comprehensive income by component, net of tax:
Unrealized holding (losses) gains arising during period (Net of deferred taxes of $87 and $127, respectively)	(124)	179
Reclassification adjustment for gains included in net income (Net of deferred taxes of $1 and $258, respectively)	(2)	(364)
Other comprehensive income (loss), net of tax	(126)	(185)
Comprehensive income, net of tax	$ 19,900	$ 18,416