Intangible Assets Summary of Intangible Asset Account Activity (Details) - Finite-Lived Intangible Assets, Major Class Name [Domain] - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Intangible Assets [Line Items]
Beginning balance, intangible assets, gross	$ 748,148	$ 804,281
Finite-lived Intangible Assets Acquired	0	497
Impairment of Intangible Assets, Finite-lived	(497)	0
Effect of change in exchange rates	(29,247)	(4,075)
Ending balance, intangible assets, gross	$ 718,404	$ 800,703