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Employee Benefit Plans
 9 Months Ended
Sep. 30, 2018
Retirement Benefits [Abstract]  
Employee Benefit Plans
Employee Benefit Plans

The net periodic pension cost for the Corporation’s Defined Benefit Pension Plan ("Pension Plan") consisted of the following components:
 
Three months ended September 30
 
Nine months ended September 30
 
2018
 
2017
 
2018
 
2017
 
(in thousands)
Interest cost
$
763

 
$
830

 
$
2,290

 
$
2,490

Expected return on plan assets
(512
)
 
(451
)
 
(1,536
)
 
(1,353
)
Net amortization and deferral
607

 
663

 
1,822

 
1,989

Net periodic pension cost
$
858

 
$
1,042

 
$
2,576

 
$
3,126


The components of the net benefit for the Corporation’s Postretirement Benefits Plan ("Postretirement Plan") consisted of the following components:
 
Three months ended September 30
 
Nine months ended September 30
 
2018
 
2017
 
2018
 
2017
 
(in thousands)
Interest cost
$
13

 
$
17

 
$
42

 
$
51

Net accretion and deferral
(139
)
 
(141
)
 
(419
)
 
(423
)
Net periodic benefit
$
(126
)
 
$
(124
)
 
$
(377
)
 
$
(372
)

The Corporation recognizes the funded status of its Pension Plan and Postretirement Plan on the consolidated balance sheets and recognizes the change in that funded status through other comprehensive income.