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Employee Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2018
Retirement Benefits [Abstract]  
Components of Net Periodic Benefit Cost
The following table sets forth the components of net periodic benefit (income) cost for the three months ended June 30, 2018 and 2017 based on December 31, 2017 and 2016 actuarial measurement dates, respectively:
 
 
Defined
pension plan
benefits
 
Other
postretirement
benefits
(In thousands)
2018
 
2017
 
2018
 
2017
Service cost (income) – benefits earned during the year
$
41

 
$
(11
)
 
$
28

 
$
28

Interest cost on projected benefit obligations
222

 
469

 
47

 
66

Expected return on plan assets
(591
)
 
(396
)
 
—

 
—

Amortization of prior service cost
—

 
—

 
—

 
(7
)
Amortization of net loss (benefit)
201

 
141

 
(15
)
 
(24
)
Settlement expense
8,168

 
—

 
—

 
—

Net periodic benefit cost
$
8,041

 
$
203

 
$
60

 
$
63



The following table sets forth the components of net periodic benefit cost for the six months ended June 30, 2018 and 2017 based on December 31, 2017 and 2016 actuarial measurement dates, respectively:
 
 
Defined
pension plan
benefits
 
Other
postretirement
benefits
(In thousands)
2018
 
2017
 
2018
 
2017
Service cost – benefits earned during the year
$
70

 
$
13

 
$
62

 
$
63

Interest cost on projected benefit obligations
317

 
787

 
95

 
117

Expected return on plan assets
(835
)
 
(798
)
 
—

 
—

Amortization of prior service cost
—

 
—

 
(7
)
 
(13
)
Amortization of net loss (benefit)
289

 
276

 
(15
)
 
(24
)
Settlement expense
8,168

 
—

 
—

 
—

Net periodic benefit cost
$
8,009

 
$
278

 
$
135

 
$
143