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Employee Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 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 March 31, 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
$
29

 
$
24

 
$
34

 
$
35

Interest cost on projected benefit obligations
95

 
318

 
48

 
51

Expected return on plan assets
(244
)
 
(402
)
 
—

 
—

Amortization of prior service cost
—

 
—

 
(6
)
 
(6
)
Amortization of net loss
88

 
135

 
—

 
—

Net periodic benefit (income) cost
$
(32
)
 
$
75

 
$
76

 
$
80