Other Comprehensive Income (Loss) (Schedule Of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	$ (1,406)	$ (1,690)
Other comprehensive income (loss)	(240)	172
Balance	(1,646)	(1,518)
Foreign Currency Translation Adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	(1,475)	(1,649)
Other comprehensive income (loss)	(446)	70
Balance	(1,921)	(1,579)
Available-for-sale Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	69	(41)
Other comprehensive income (loss)	206	102
Balance	$ 275	$ 61