Accumulated Other Comprehensive Loss (Schedule Of Accumulated Other Comprehensive Loss By Component) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Accumulated other comprehensive income loss [Line Items]
Accumulated other comprehensive loss, net of tax, beginning balance	$ (13,016)
Other comprehensive loss before reclassifications	(890)
Other comprehensive loss	(890)	$ (3,461)
Accumulated other comprehensive loss, net of tax, ending balance	(13,906)
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	1,348
Other comprehensive loss	1,348
Accumulated other comprehensive loss, net of tax, ending balance	(11,731)
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	(2,232)
Other comprehensive loss	(2,232)
Accumulated other comprehensive loss, net of tax, ending balance	(2,232)
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	(6)
Other comprehensive loss	(6)
Accumulated other comprehensive loss, net of tax, ending balance	(101)
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 loss	0
Accumulated other comprehensive loss, net of tax, ending balance	$ 158