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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2012
Assets and Liabilities Measured at Fair Value on a Recurring Basis

The following table summarizes the financial assets and liabilities measured at fair value on a recurring basis as of December 31, 2012:

 

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

Assets:

      

Cash equivalents

    $ 5,098       $ —     

Money market instruments

      5,076         —     

Corporate stock

      2,131         —     

Corporate bonds

      —           146,073   

Asset-backed securities

      —           52,376   

Treasury bills

      —           42,273   

Agency bonds

      —           36,923   

Municipal bonds

      —           34,070   

Sovereign bonds

      —           14,592   

Covered bonds

      —           11,182   

Currency forward contracts

      44         —     

Liabilities:

      

Currency forward contracts

      14         —