Intangible Assets Summary of Intangible Asset Account Activity (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Beginning balance, intangible assets, gross	$ 748,148	$ 804,281
Intangible assets acquired	4,827	1,453
Impairment of Intangible Assets, Finite-lived	497	0
Effect of change in exchange rates	(49,971)	(57,586)
Ending balance, intangible assets, gross	$ 702,507	$ 748,148