Accumulated Other Comprehensive Loss (Schedule Of Accumulated Other Comprehensive Loss By Component) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 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			(1,302)
Amounts reclassified from accumulated other comprehensive loss			(1)
Other comprehensive income (loss)	$ 1,064	$ 385	(1,303)	$ (2,419)
Accumulated other comprehensive loss, net of tax, ending balance	(14,319)		(14,319)
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			815
Amounts reclassified from accumulated other comprehensive loss			0
Other comprehensive income (loss)			815
Accumulated other comprehensive loss, net of tax, ending balance	(12,264)		(12,264)
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			(2,134)
Amounts reclassified from accumulated other comprehensive loss			0
Other comprehensive income (loss)			(2,134)
Accumulated other comprehensive loss, net of tax, ending balance	(2,134)		(2,134)
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			17
Amounts reclassified from accumulated other comprehensive loss			0
Other comprehensive income (loss)			17
Accumulated other comprehensive loss, net of tax, ending balance	(78)		(78)
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
Amounts reclassified from accumulated other comprehensive loss			(1)
Other comprehensive income (loss)			(1)
Accumulated other comprehensive loss, net of tax, ending balance	$ 157		$ 157