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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 29, 2019
Jun. 30, 2018
Jun. 29, 2019
Jun. 30, 2018
Consolidated Statements of Comprehensive Income [Abstract]        
Net income $ 20,475 $ 19,095 $ 34,780 $ 35,286
Available-for-sale marketable securities        
Unrealized holding gains (losses) arising during period (Net of deferred taxes of $(179) and $14, respectively for the thirteen Weeks Ended and $(423) and $172, respectively for the twenty-six Weeks Ended) 454 (42) 1,075 (445)
Reclassification adjustment for losses included in net income (Net of deferred taxes of $0 and $15, respectively for the twenty-six Weeks Ended)       39
Other comprehensive income gain (loss), net of tax 454 (42) 1,075 (406)
Comprehensive income, net of tax $ 20,929 $ 19,053 $ 35,855 $ 34,880