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Accumulated Other Comprehensive Income (Schedule Of Accumulated Other Comprehensive Income) (Details) - Unrealized Gains On Available-For-Sale Marketable Securities [Member]
$ in Thousands
9 Months Ended
Sep. 26, 2020
USD ($)
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Accumulated other comprehensive income balance, beginning balance $ 1,480
Other comprehensive income before reclassifications 1,479
Amounts reclassified from accumulated other comprehensive income 0
Net current period change in other comprehensive income 1,479
Accumulated other comprehensive income balance, ending balance $ 2,959