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Fair Value Measurements (Tables)
 6 Months Ended
Jun. 30, 2013
Fair Value Disclosures [Abstract]  
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 June 30, 2013 (in thousands):

 

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

Assets:

      

Cash equivalents

    $ 12,947       $ —     

Corporate stock

      1,669         —     

Money market instruments

      460         —     

Corporate bonds

      —           190,166   

Asset-backed securities

      —           68,176   

Treasury bills

      —           52,415   

Sovereign bonds

      —           30,435   

Municipal bonds

      —           28,583   

Commercial paper

      —           3,000   

Agency bonds

      —           1,498   

Currency forward contracts

      —           61   

Liabilities:

      

Currency forward contracts

      —           11