Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 29, 2018	Sep. 30, 2017	Sep. 29, 2018	Sep. 30, 2017
Consolidated Statements of Comprehensive Income [Abstract]
Net income	$ 14,207	$ 4,449	$ 49,492	$ 34,760
Other comprehensive income (loss) by component, net of tax:
Unrealized holding gains (losses) arising during period (Net of deferred taxes of $68 and $194, respectively for the thirteen Weeks Ended and $240 and $68, respectively for the thirty-nine Weeks Ended)	(175)	281	(620)	147
Reclassification adjustment for losses included in net income (Net of deferred taxes of $0 and $2, respectively for the thirteen Weeks Ended and $15 and $2, respectively for the thirty-nine Weeks Ended)		3	39	3
Other comprehensive income gain (loss), net of tax	(175)	284	(581)	150
Comprehensive income, net of tax	$ 14,032	$ 4,733	$ 48,911	$ 34,910