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Retirement Plan (Tables)
6 Months Ended
Jun. 30, 2011
Retirement Plan  
Net Periodic Pension Expense
     Three Months Ended
June 30,
    Six Months Ended
June 30,
 
     2011     2010     2011     2010  
     (In thousands)  

Service cost – benefit earned during the period

   $ 1,268      $ 1,156      $ 2,535      $ 2,298   

Interest cost on projected benefit obligations

     1,281        1,291        2,562        2,577   

Expected return on plan assets

     (1,339     (1,164     (2,678     (2,288

Amortization of prior service cost

     97        98        195        195   

Amortization of net loss

     533        474        1,066        1,098   
  

 

 

   

 

 

   

 

 

   

 

 

 

Net periodic pension expense

   $ 1,840      $ 1,855      $ 3,680      $ 3,880