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Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2011
Fair Value Measurements [Abstract]  
Assets and liabilities measured at fair value on a recurring basis
                 
    Quoted Prices in
Active Markets
for Identical
Assets (Level 1)
    Significant Other
Observable

Inputs (Level 2)
 

Assets:

               

Money market instruments

  $ 1,699     $ -  

Municipal bonds

    -       123,716  

Corporate bonds

    -       115,472  

Agency bonds

    -       39,880  

Sovereign bonds

    -       26,371  

Covered bonds

    -       6,020  

Treasury bills

    -       1,945  

Currency forward contracts

    14       -  

Liabilities:

               

Currency forward contracts

    165       -  
Company's fair value hierarchy for the Siemens Customer Relationships
                         
    Significant
Unobservable
Inputs (Level 3)
    Total     Total Loss  

Siemens Customer Relationships

  $ 300     $ 300     $ (1,000