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Defined Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2014
Compensation and Retirement Disclosure [Abstract]  
Net Periodic Cost (Benefit)
The components of the combined net periodic expense (benefit) for the Corporation’s defined benefit pension plans were as follows:
 
Three Months Ended 
 September 30,
 
Nine Months Ended 
 September 30,
 
2014
 
2013
 
2014
 
2013
Expected return on plan assets, net of expenses
$
(3,129
)
 
$
(2,772
)
 
$
(9,386
)
 
$
(8,316
)
Interest cost on projected benefit obligation
2,001

 
1,835

 
6,002

 
5,506

Net amortization and deferral
672

 
1,640

 
2,015

 
4,919

Net periodic expense (benefit)
$
(456
)
 
$
703

 
$
(1,369
)
 
$
2,109