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Defined Benefit Plans
 9 Months Ended
Sep. 30, 2013
Compensation and Retirement Disclosure [Abstract]  
Defined Benefit Plans
Defined Benefit Plans
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


The Corporation’s non-qualified defined benefit pension plan is not funded. No contributions to the qualified defined benefit pension plan were made during the nine months ended September 30, 2013. The Corporation does not expect to make any contributions to the qualified defined benefit plan during the remainder of 2013.