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Fair Value Measurements (Tables)
3 Months Ended
Mar. 31, 2012
Fair Value Measurements [Abstract]  
Financial assets that are measured at fair value on a recurring basis
                                 
    March 31, 2012     Fair Value Measurements Using  

Financial assets:

    Level 1     Level 2     Level 3  
    (In thousands)  

Marketable equity securities

  $ 4,628     $ 4,628     $ —       $ —    
     
    March 31, 2011     Fair Value Measurements Using  

Financial assets:

    Level 1     Level 2     Level 3  
    (In thousands)  

Marketable equity securities

  $ 4,674     $ 4,674     $ —       $ —    
     
    September 30, 2011     Fair Value Measurements Using  

Financial assets:

    Level 1     Level 2     Level 3  
    (In thousands)  

Marketable equity securities

  $ 5,366     $ 5,366     $ —       $ —