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Goodwill and Intangible Assets (Changes in the Carrying Amount of Goodwill, by Segment) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Goodwill and Intangible Assets Disclosure [Abstract]    
Balance at December 31 $ 1,733,722 $ 1,352,281
Goodwill acquired during the year 82,599 402,575
Earn-out and milestone payments (36) 1,122
Purchase adjustments (70,034) 615
Effect of foreign currency translation 13,647 (22,871)
Balance at December 31 $ 1,759,898 $ 1,733,722