v2.4.0.6
Fair Value Measurements Contingent Consideration Rollforward (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Dec. 31, 2011
Dec. 31, 2010
Fair Value Disclosures [Abstract]        
Contingent Consideration, Balance at Period Start, End $ 138,328 $ 11,100 $ 135,591 $ 11,100
Changes in Valuation $ 2,737 $ 0