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Basis of Presentation (Tables)
6 Months Ended
Jun. 30, 2012
Basis of Presentation [Abstract]  
Assets and Liabilities Measured at Fair Value on a Recurring Basis
                         
    Level 1     Level 2     Level 3  

Assets:

                       

Cash equivalents

                       

Money market funds

  $ 50,561     $ —       $ —    

Available-for-sale securities

                       

Communications industry

  $ 315     $ —       $ —    

Derivatives

                       

Foreign exchange contracts

  $ —       $ 1,431     $ —    

Non-qualified pension plan assets

  $ 257     $ —       $ —    

Liabilities:

                       

Derivatives

                       

Foreign exchange contracts

  $ —       $ 1,913     $ —