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Fair Value Measurements (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Assets    
Short-term investments $ 2,280 $ 18,686
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
   
Assets    
Cash and cash equivalents 160,177 196,077
Short-term investments 2,280 18,686
Recurring | Significant Unobservable Inputs (Level 3)
   
Liabilities    
Contingent consideration 5,403 9,233
Recurring | Amount Recorded on Balance Sheet
   
Assets    
Cash and cash equivalents 160,177 196,077
Short-term investments 2,280 18,686
Liabilities    
Contingent consideration $ 5,403 $ 9,233