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Fair Value Measurement (Tables)
9 Months Ended
Sep. 30, 2013
Fair Value Measurement [Abstract]  
Schedule of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis
(In thousands)         Fair Value Measurements at September 30, 2013  
          Quoted Prices in     Significant Other     Significant  
          Active Markets for     Observable     Unobservable  
          Identical Assets     Inputs     Inputs  
    Total     (Level 1)     (Level 2)     (Level 3)  
Assets:                                
Short-term investments   $ 150,486     $ -     $ 150,486     $ -  
                                 
Foreign currency forward exchange contracts not accounted for using hedge accounting     11       -       11       -  
                                 
    $ 150,497     -     150,497     $ -  
             
(In thousands)         Fair Value Measurements at December 31, 2012  
          Quoted Prices in     Significant Other     Significant  
          Active Markets for     Observable     Unobservable  
          Identical Assets     Inputs     Inputs  
    Total     (Level 1)     (Level 2)     (Level 3)  
Assets:                                
Foreign currency forward exchange contracts not accounted for using hedge accounting   $ 784     -     784     $ -