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Defined Benefit Plans (Tables)
6 Months Ended
Jun. 30, 2013
Compensation And Retirement Disclosure [Abstract]  
Net Periodic Cost (Benefit)

The components of the combined net periodic expense for the Corporation’s defined benefit pension plans were as follows:

 

      Three Months Ended
June 30,
    Six Months Ended
June 30,
 
     2013     2012     2013     2012  

Expected return on plan assets, net of expenses

   $ (2,772   $ (2,603   $ (5,544   $ (5,206

Interest cost on projected benefit obligation

     1,836        1,950        3,671        3,900   

Net amortization and deferral

     1,639        1,428        3,279        2,657   
  

 

 

   

 

 

   

 

 

   

 

 

 

Net periodic cost (benefit)

   $ 703      $ 775      $ 1,406      $ 1,351