Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Apr. 01, 2017
Consolidated Statements of Comprehensive Income [Abstract]
Net income	$ 16,191	$ 11,836
Other comprehensive income (loss) by component, net of tax:
Unrealized holding gains (losses) arising during period (Net of deferred taxes of $158 and $11, respectively for the 13 Weeks Ended)	(403)	64
Reclassification adjustment for (gains) losses included in net income (Net of deferred taxes of $15 and $0, respectively for the 13 Weeks Ended)	39
Other comprehensive income (loss), net of tax	(364)	64
Comprehensive income, net of tax	$ 15,827	$ 11,900