Comprehensive Income (Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			$ (11,664)	$ 2,550
Current-period other comprehensive (loss) income			(15,379)	(1,077)
Reclassified from accumulated OCI into income			(12,832)	(1,456)
Income tax expense	$ (3,935)	$ 5,224	(8,238)	4,584
Ending Balance	(31,637)	(4,567)	(31,637)	(4,567)
Currency Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			(17,304)	1,311
Current-period other comprehensive (loss) income			(14,273)	(10,467)
Income tax expense			(3,318)	1,494
Ending Balance	(28,259)	(10,650)	(28,259)	(10,650)
Investments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			(1,399)	(1,066)
Current-period other comprehensive (loss) income			441	(129)
Income tax expense			88	75
Ending Balance	(1,046)	(1,270)	(1,046)	(1,270)
Derivative Instruments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			7,039	2,305
Current-period other comprehensive (loss) income			(1,547)	9,519
Reclassified from accumulated OCI into income			(12,832)	(1,456)
Income tax expense			(5,008)	3,015
Ending Balance	$ (2,332)	$ 7,353	$ (2,332)	$ 7,353