Other Comprehensive Income (Loss) (Schedule Of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
AOCI Attributable to Parent, Net of Tax [Roll Forward]
BALANCE			$ (1,940)	$ (1,709)
Other comprehensive income before reclassifications			434	163
Amounts reclassified from accumulated other comprehensive loss			0	36
Other comprehensive income (loss), net of tax	$ 122	$ (152)	434	199
BALANCE	(1,506)	(1,510)	(1,506)	(1,510)
Foreign Currency Translation Adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
BALANCE			(1,928)	(1,545)
Other comprehensive income before reclassifications			414	78
Amounts reclassified from accumulated other comprehensive loss			0	0
Other comprehensive income (loss), net of tax			414	78
BALANCE	(1,514)	(1,467)	(1,514)	(1,467)
Available-for-sale Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
BALANCE			(12)	(17)
Other comprehensive income before reclassifications			20	32
Amounts reclassified from accumulated other comprehensive loss			0	0
Other comprehensive income (loss), net of tax			20	32
BALANCE	8	15	8	15
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)