Intangible Assets Summary of Intangible Asset Account Activity (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2015	Sep. 30, 2014
Intangible Assets [Line Items]
Beginning balance, intangible assets, gross		$ 748,148	$ 804,281
Finite-lived Intangible Assets Acquired	$ 4,827	4,827	1,453
Impairment of Intangible Assets, Finite-lived		(497)	0
Effect of change in exchange rates		(41,245)	(35,742)
Ending balance, intangible assets, gross	$ 711,233	$ 711,233	$ 769,992