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Defined Benefit Plans (Tables)
9 Months Ended
Sep. 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 
 September 30,
 
Nine Months Ended 
 September 30,
 
2013
 
2012
 
2013
 
2012
Expected return on plan assets, net of expenses
$
(2,772
)
 
$
(2,603
)
 
$
(8,316
)
 
$
(7,809
)
Interest cost on projected benefit obligation
1,835

 
1,951

 
5,506

 
5,851

Net amortization and deferral
1,640

 
1,427

 
4,919

 
4,084

Net periodic cost (benefit)
$
703

 
$
775

 
$
2,109

 
$
2,126