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Fair Value Measurements (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Assets    
Short-term investments $ 3,428 $ 3,441
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
   
Assets    
Cash and cash equivalents 113,777 157,551
Short-term investments 3,428 3,441
Recurring | Significant Unobservable Inputs (Level 3)
   
Liabilities    
Contingent consideration 13,972 23,431
Recurring | Amount Recorded on Balance Sheet
   
Assets    
Cash and cash equivalents 113,777 157,551
Short-term investments 3,428 3,441
Liabilities    
Contingent consideration $ 13,972 $ 23,431