Comprehensive Income (Loss) (Schedule Of Accumulated Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
AOCI Attributable to Parent, Net of Tax [Roll Forward]
BALANCE	$ (1,940)	$ (1,709)
Other comprehensive income before reclassifications	203	383
Amounts reclassified from accumulated other comprehensive loss	0	31
Other comprehensive income, net of tax	203	414
BALANCE	(1,737)	(1,295)
Foreign Currency Translation Adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
BALANCE	(1,928)	(1,545)
Other comprehensive income before reclassifications	190	270
Amounts reclassified from accumulated other comprehensive loss	0	0
Other comprehensive income, net of tax	190	270
BALANCE	(1,738)	(1,275)
Available-for-sale Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
BALANCE	(12)	(17)
Other comprehensive income before reclassifications	13	53
Amounts reclassified from accumulated other comprehensive loss	0	0
Other comprehensive income, net of tax	13	53
BALANCE	1	36
Foreign Exchange Forward Contracts
AOCI Attributable to Parent, Net of Tax [Roll Forward]
BALANCE	0	(147)
Other comprehensive income before reclassifications	0	60
Amounts reclassified from accumulated other comprehensive loss	0	31
Other comprehensive income, net of tax	0	91
BALANCE	$ 0	$ (56)