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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 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 measured at fair value on a recurring basis as of December 31, 2013 (in thousands):

 

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

Assets:

      

Money market instruments

    $ 520       $ -   

Corporate bonds

      -         218,949   

Asset-backed securities

      -         75,379   

Treasury bills

      -         73,666   

Sovereign bonds

      -         27,833   

Municipal bonds

      -         15,195   

Agency bonds

      -         1,499   

Cash flow hedge forward contracts

      -         204   

Economic hedge forward contracts

      -         6   

Liabilities:

      

Cash flow hedge forward contracts

      -         98   

Economic hedge forward contracts

      -         24