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Employee Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2017
Compensation and Retirement Disclosure [Abstract]  
Components of Net Periodic Benefit Cost
The following table sets forth the components of net periodic benefit cost for the three months ended March 31, 2017 and 2016 based on December 31, 2016 and 2015 actuarial measurement dates, respectively:
 
 
Defined
pension plan
benefits
 
Other
postretirement
benefits
(In thousands)
2017
 
2016
 
2017
 
2016
Service cost – benefits earned during the year
$
24

 
$
7

 
$
35

 
$
36

Interest cost on projected benefit obligations
318

 
455

 
51

 
64

Expected return on plan assets
(402
)
 
(549
)
 
—

 
—

Amortization of prior service cost
—

 
—

 
(6
)
 
(6
)
Amortization of net loss
135

 
157

 
—

 
—

Net periodic benefit cost
$
75

 
$
70

 
$
80

 
$
94