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Employee Benefit Plans
 9 Months Ended
Sep. 30, 2017
Retirement Benefits [Abstract]  
Employee Benefit Plans
Employee Benefit Plans

The net periodic benefit 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
 
2017
 
2016
 
2017
 
2016
 
(in thousands)
Service cost (1)
$
—

 
$
172

 
$
—

 
$
516

Interest cost
830

 
880

 
2,490

 
2,640

Expected return on plan assets
(451
)
 
(580
)
 
(1,353
)
 
(1,739
)
Net amortization and deferral
663

 
605

 
1,989

 
1,815

Net periodic benefit cost
$
1,042

 
$
1,077

 
$
3,126

 
$
3,232


(1)
The Pension Plan was curtailed effective January 1, 2008. Service cost was related to administrative costs associated with the plan and was not due to the accrual of additional participant benefits.

The net periodic benefit of the Corporation’s Postretirement Benefits Plan ("Postretirement Plan") consisted of the following components:
 
Three months ended September 30
 
Nine months ended September 30
 
2017
 
2016
 
2017
 
2016
 
(in thousands)
Interest cost
$
17

 
$
21

 
$
51

 
$
64

Expected return on plan assets
—

 
—

 
—

 
(1
)
Net accretion and deferral
(141
)
 
(138
)
 
(423
)
 
(413
)
Net periodic benefit
$
(124
)
 
$
(117
)
 
$
(372
)
 
$
(350
)

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.