Intangible Assets Summary of Intangible Asset Account Activity (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Intangible Assets [Line Items]
Beginning balance, intangible assets, gross	$ 702,507	$ 748,148
Impairment of Intangible Assets, Finite-lived	0	(497)
Effect of change in exchange rates	6,474	(42,038)
Ending balance, intangible assets, gross	$ 708,981	$ 705,613