Intangible Assets Summary of Intangible Asset Account Activity (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Intangible Assets [Line Items]
Beginning balance, intangible assets, gross	$ 804,281	$ 802,540
Intangible assets acquired	1,453	(1,500)
Effect of change in exchange rates	(35,742)	(3,000)
Ending balance, intangible assets, gross	$ 769,992	$ 798,040