Other Comprehensive Loss (Schedule Of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	$ (1,406)	$ (1,690)
Other comprehensive income (loss)	(490)	133
Balance	(1,896)	(1,557)
Foreign Currency Translation Adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	(1,475)	(1,649)
Other comprehensive income (loss)	(600)	87
Balance	(2,075)	(1,562)
Available-for-sale Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	69	(41)
Other comprehensive income (loss)	110	46
Balance	$ 179	$ 5