Intangible Assets Summary of Intangile Asset Account Activity (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Finite-Lived Intangible Assets [Line Items]
Beginning intangible assets, gross	$ 749,194	$ 759,152
Intangible assets acquired	43,400	10,297
Asset no longer in use written off	0	(8,369)
Effect of change In exchange rates	(13,835)	40,968
Ending intangible assets, gross	$ 778,759	$ 802,048