Intangible Assets Summary of Intangile Asset Account Activity (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 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	(8,450)
Effect of change In exchange rates	1,220	12,263
Ending intangible assets, gross	$ 793,814	$ 773,262