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Fair Value Measurement (Tables)
6 Months Ended
Jun. 30, 2011
Fair Value Measurement  
Schedule of Fair Value Assets and Liabilities Measured on Recurring Basis
           Fair Value Measurements at
June 30, 2011
 

(in thousands)

   Total Carrying
Value at
June 30, 2011
    (Level 1)      (Level 2)      (Level 3)  

Cash and cash equivalents

   $ 390,395     $ 390,395      $ —         $ —     

Short term investments

   $ 127,845     $ 127,845      $ —         $ —     

Contingent consideration

   $ (13,853   $ —         $ —         $ (13,853