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Fair Value Measurements (Tables)
 3 Months Ended
Mar. 31, 2013
Assets and Liabilities Measured at Fair Value on a Recurring Basis

The following table summarizes the financial assets and liabilities required to be measured at fair value on a recurring basis as of March 31, 2013 (in thousands):

 

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

Assets:

      

Cash equivalents

    $ 9,398       $ —     

Money market instruments

      1,069         —     

Corporate stock

      1,763         —     

Corporate bonds

      —           171,405   

Asset-backed securities

      —           65,319   

Agency bonds

      —           39,278   

Treasury bills

      —           33,727   

Municipal bonds

      —           29,571   

Sovereign bonds

      —           11,823   

Covered bonds

      —           11,271   

Commercial paper

      —           2,998   

Currency forward contracts

      1         —     

Liabilities:

      

Currency forward contracts

      83         —