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Other Comprehensive Income (Schedule Of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
BALANCE $ (1,690) $ (1,409)
Other comprehensive income (loss) before reclassifications 172 (230)
Total change for the period   (274)
BALANCE (1,518) (1,683)
Foreign Currency Translation Adjustments    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
BALANCE (1,649) (1,394)
Other comprehensive income (loss) before reclassifications 70 (202)
Total change for the period   (202)
BALANCE (1,579) (1,596)
Available-for-sale Securities    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
BALANCE (41) (15)
Other comprehensive income (loss) before reclassifications 102 (28)
Total change for the period   (72)
BALANCE $ 61 (87)
ASU No. 2016-01 [Member]    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Decrease related to adoption of ASU 2016-01   (44)
ASU No. 2016-01 [Member] | Foreign Currency Translation Adjustments    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Decrease related to adoption of ASU 2016-01   0
ASU No. 2016-01 [Member] | Available-for-sale Securities    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Decrease related to adoption of ASU 2016-01   $ (44)