Accumulated Other Comprehensive Loss (Schedule Of Accumulated Other Comprehensive Loss By Component) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Accumulated other comprehensive income loss [Line Items]
Accumulated other comprehensive loss, net of tax, beginning balance			$ (9,475)
Other comprehensive loss before reclassifications			(2,409)
Amounts reclassified from accumulated other comprehensive loss			(10)
Net current period other comprehensive loss	$ 385	$ (1,224)	(2,419)	$ (1,626)
Accumulated other comprehensive loss, net of tax, ending balance	(11,894)		(11,894)
Foreign currency translaction adjustments [Member]
Accumulated other comprehensive income loss [Line Items]
Accumulated other comprehensive loss, net of tax, beginning balance			(9,688)
Other comprehensive loss before reclassifications			(2,386)
Amounts reclassified from accumulated other comprehensive loss			0
Net current period other comprehensive loss			(2,386)
Accumulated other comprehensive loss, net of tax, ending balance	(12,074)		(12,074)
Unrealized loss on investments, net of tax [Member]
Accumulated other comprehensive income loss [Line Items]
Accumulated other comprehensive loss, net of tax, beginning balance			(64)
Other comprehensive loss before reclassifications			(23)
Amounts reclassified from accumulated other comprehensive loss			0
Net current period other comprehensive loss			(23)
Accumulated other comprehensive loss, net of tax, ending balance	(87)		(87)
Other [Member]
Accumulated other comprehensive income loss [Line Items]
Accumulated other comprehensive loss, net of tax, beginning balance			277
Other comprehensive loss before reclassifications			0
Amounts reclassified from accumulated other comprehensive loss			(10)
Net current period other comprehensive loss			(10)
Accumulated other comprehensive loss, net of tax, ending balance	$ 267		$ 267