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Fair Value Measurements (Details 3) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Fair Value, Measurements, Recurring [Member]
Mar. 31, 2013
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Sep. 30, 2012
Fair Value, Measurements, Recurring [Member]
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Business Acquisition, Contingent Consideration [Line Items]                    
Fair value, beginning of period         $ 281,000,000 $ 281,000,000 $ 293,900,000 $ 290,300,000 $ 280,900,000 $ 151,000,000
Additions 0 0 0 122,200,000            
(Gain) loss on fair value remeasurement of contingent consideration (97,000) 9,456,000 (2,983,000) 23,573,000            
Payments 100,000 0 (9,900,000) (6,500,000)            
Fair value, end of period         $ 281,000,000 $ 281,000,000 $ 293,900,000 $ 290,300,000 $ 280,900,000 $ 151,000,000