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Fair Value Measurements (Tables)
 9 Months Ended
Sep. 30, 2012
Assets and Liabilities Measured at Fair Value on Recurring Basis

The following table summarizes the financial assets and liabilities required to be measured at fair value on a recurring basis as of September 30, 2012 (in thousands):

 

     Quoted Prices in
Active Markets
for Identical
Assets (Level 1)		      Significant  Other
Observable
Inputs (Level 2)		  

Assets:

      

Cash equivalents

    $ 6,799       $ —     

Money market instruments

      4,099         —     

Corporate bonds

      —           136,864   

Municipal bonds

      —           83,843   

Asset-backed securities

      —           47,202   

Treasury bills

      —           46,032   

Agency bonds

      —           27,023   

Sovereign bonds

      —           7,833   

Covered bonds

      —           7,421   

Currency forward contracts

      56         —     

Liabilities:

      

Currency forward contracts

      18         —