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Fair Value Disclosures (Tables)
6 Months Ended
Jun. 30, 2012
Fair Value Disclosures [Abstract]  
Inputs used in measuring fair value of assets and liabilities
                                 
December 31, 2011         Quoted Prices in Active
Markets for Identical
Assets
    Significant Other
Observable Inputs
    Significant
Unobservable Inputs
 

(In thousands)

  Total     Level 1     Level 2     Level 3  

Government-sponsored securities

  $ 993     $ —       $ 993     $ —    

Corporate debt securities

    1,086       721       365       —    
   

 

 

   

 

 

   

 

 

   

 

 

 

Total

  $ 2,079     $ 721     $ 1,358     $ —