Accumulated Other Comprehensive Income (Schedule Of Accumulated Other Comprehensive Income) (Details) - Unrealized Gain On Available-For-Sale Marketable Securities [Member] $ in Thousands	6 Months Ended
	Jun. 29, 2019 USD ($)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income balance, beginning balance	$ 262
Other comprehensive income before reclassifications	1,075
Amounts reclassified from accumulated other comprehensive income	0
Net current period change in other comprehensive income	1,075
Accumulated other comprehensive income balance, ending balance	$ 1,337