Other Comprehensive Income (Loss) (Schedule Of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
AOCI Attributable to Parent, Net of Tax [Roll Forward]
BALANCE			$ (1,940)	$ (1,709)
Other comprehensive income before reclassifications			312	315
Amounts reclassified from accumulated other comprehensive loss			0	36
Other comprehensive income (loss), net of tax	$ 109	$ (63)	312	351
BALANCE	(1,628)	(1,358)	(1,628)	(1,358)
Foreign Currency Translation Adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
BALANCE			(1,928)	(1,545)
Other comprehensive income before reclassifications			292	194
Amounts reclassified from accumulated other comprehensive loss			0	0
Other comprehensive income (loss), net of tax			292	194
BALANCE	(1,636)	(1,351)	(1,636)	(1,351)
Available-for-sale Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
BALANCE			(12)	(17)
Other comprehensive income before reclassifications			20	68
Amounts reclassified from accumulated other comprehensive loss			0	0
Other comprehensive income (loss), net of tax			20	68
BALANCE	8	51	8	51
Foreign Exchange Forward Contracts
AOCI Attributable to Parent, Net of Tax [Roll Forward]
BALANCE			0	(147)
Other comprehensive income before reclassifications			0	53
Amounts reclassified from accumulated other comprehensive loss			0	36
Other comprehensive income (loss), net of tax			0	89
BALANCE	$ 0	$ (58)	$ 0	$ (58)