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Employee Benefit Plans
 6 Months Ended
Jun. 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 June 30
 
Six months ended June 30
 
2018
 
2017
 
2018
 
2017
 
(in thousands)
Interest cost
$
696

 
$
830

 
1,527

 
1,660

Expected return on plan assets
(573
)
 
(451
)
 
(1,024
)
 
(902
)
Net amortization and deferral
551

 
663

 
1,215

 
1,326

Net periodic pension cost
$
674

 
$
1,042

 
$
1,718

 
$
2,084


The components of the net benefit for the Corporation’s Postretirement Benefits Plan ("Postretirement Plan") consisted of the following components:
 
Three months ended June 30
 
Six months ended June 30
 
2018
 
2017
 
2018
 
2017
 
(in thousands)
Interest cost
$
12

 
$
17

 
$
29

 
$
34

Net accretion and deferral
(139
)
 
(141
)
 
(280
)
 
(282
)
Net periodic benefit
$
(127
)
 
$
(124
)
 
$
(251
)
 
$
(248
)

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.