Accumulated Other Comprehensive Loss (Schedule Of Accumulated Other Comprehensive Loss By Component) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Accumulated other comprehensive income loss [Line Items]
Accumulated other comprehensive income (loss), net of tax, beginning balance			$ (9,475)
Other comprehensive loss before reclassifications			(2,797)
Amounts reclassified from accumulated other comprehensive loss			(7)
Other comprehensive loss	$ 657	$ (358)	(2,804)	$ (402)
Accumulated other comprehensive income (loss), net of tax, ending balance	(12,279)		(12,279)
Foreign currency translation adjustments [Member]
Accumulated other comprehensive income loss [Line Items]
Accumulated other comprehensive income (loss), net of tax, beginning balance			(9,688)
Other comprehensive loss before reclassifications			(2,764)
Amounts reclassified from accumulated other comprehensive loss			0
Other comprehensive loss			(2,764)
Accumulated other comprehensive income (loss), net of tax, ending balance	(12,452)		(12,452)
Unrealized loss on investments, net of tax [Member]
Accumulated other comprehensive income loss [Line Items]
Accumulated other comprehensive income (loss), net of tax, beginning balance			(64)
Other comprehensive loss before reclassifications			(33)
Amounts reclassified from accumulated other comprehensive loss			0
Other comprehensive loss			(33)
Accumulated other comprehensive income (loss), net of tax, ending balance	(97)		(97)
Other [Member]
Accumulated other comprehensive income loss [Line Items]
Accumulated other comprehensive income (loss), net of tax, beginning balance			277
Other comprehensive loss before reclassifications			0
Amounts reclassified from accumulated other comprehensive loss			(7)
Other comprehensive loss			(7)
Accumulated other comprehensive income (loss), net of tax, ending balance	$ 270		$ 270