Accumulated Other Comprehensive Loss (Schedule Of Accumulated Other Comprehensive Loss By Component) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Accumulated other comprehensive income loss [Line Items]
Accumulated other comprehensive loss, net of tax, beginning balance			$ (13,016)
Other comprehensive loss before reclassifications			(2,367)
Other comprehensive income (loss)	$ (1,477)	$ 657	(2,367)	$ (2,804)
Accumulated other comprehensive loss, net of tax, ending balance	(15,383)		(15,383)
Foreign currency translaction adjustments [Member]
Accumulated other comprehensive income loss [Line Items]
Accumulated other comprehensive loss, net of tax, beginning balance			(13,079)
Other comprehensive loss before reclassifications			516
Other comprehensive income (loss)			516
Accumulated other comprehensive loss, net of tax, ending balance	(12,563)		(12,563)
Derivative instruments, net of tax [Member]
Accumulated other comprehensive income loss [Line Items]
Accumulated other comprehensive loss, net of tax, beginning balance			0
Other comprehensive loss before reclassifications			(2,899)
Other comprehensive income (loss)			(2,899)
Accumulated other comprehensive loss, net of tax, ending balance	(2,899)		(2,899)
Unrealized loss on investments, net of tax [Member]
Accumulated other comprehensive income loss [Line Items]
Accumulated other comprehensive loss, net of tax, beginning balance			(95)
Other comprehensive loss before reclassifications			16
Other comprehensive income (loss)			16
Accumulated other comprehensive loss, net of tax, ending balance	(79)		(79)
Other [Member]
Accumulated other comprehensive income loss [Line Items]
Accumulated other comprehensive loss, net of tax, beginning balance			158
Other comprehensive loss before reclassifications			0
Other comprehensive income (loss)			0
Accumulated other comprehensive loss, net of tax, ending balance	$ 158		$ 158