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Defined Benefit Plans (Tables)
 6 Months Ended
Jun. 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 
 June 30,
 
Six Months Ended 
 June 30,
 
2014
 
2013
 
2014
 
2013
Expected return on plan assets, net of expenses
$
(3,128
)
 
$
(2,772
)
 
$
(6,257
)
 
$
(5,544
)
Interest cost on projected benefit obligation
2,000

 
1,836

 
4,001

 
3,671

Net amortization and deferral
671

 
1,639

 
1,343

 
3,279

Net periodic expense (benefit)
$
(457
)
 
$
703

 
$
(913
)
 
$
1,406