Accumulated Other Comprehensive Income (Schedule Of Accumulated Other Comprehensive Income) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accumulated Other Comprehensive Income [Abstract]
Beginning balance, Unrealized Gain on Investments, Net of Tax	$ 108	$ (171)
Beginning balance, Unrealized Loss on Derivative Instruments, Net of Tax	(179)	(2,070)
Beginning balance, Cumulative Translation Adjustment	13,693	18,195
Other comprehensive income (loss) before reclassifications, Unrealized Gain on Investments, Net of Tax	(107)	279	116
Other comprehensive income (loss) before reclassifications, Unrealized Loss on Derivative Instruments, Net of Tax	9,542	3,781	(1,651)
Other comprehensive income (loss) before reclassifications, Cumulative Translation Adjustment	(29,126)	(4,502)	5,671
Gains reclassified from accumulated other comprehensive income, Unrealized Loss on Derivative Instruments, Net of Tax	(2,002)	(1,890)	(3,625)
Ending balance, Unrealized Gain on Investments, Net of Tax	1	108	(171)
Ending balance, Unrealized Gain on Derivative Instruments, Net of Tax	7,361	(179)	(2,070)
Ending balance, Cumulative Translation Adjustment	(15,433)	13,693	18,195
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance	13,622	15,954
Accumulated Other Comprehensive Income, before Tax	(19,691)	(442)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(2,002)	(1,890)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance	$ (8,071)	$ 13,622	$ 15,954