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Fair Value Measurements (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Assets    
Short term investments $ 3,441 $ 23,000
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
   
Assets    
Cash and cash equivalents 157,551 120,306
Short term investments 3,441 23,000
Recurring | Significant Unobservable Inputs (Level 3)
   
Liabilities    
Contingent consideration 23,431 12,718
Recurring | Amount Recorded on Balance Sheet
   
Assets    
Cash and cash equivalents 157,551 120,306
Short term investments $ 3,441 $ 23,000