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Employee Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2016
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, 2016 and 2015 based on December 31, 2015 and 2014 actuarial measurement dates, respectively:
 
 
Defined
pension plan
benefits
 
Other
postretirement
benefits
(In thousands)
2016
 
2015
 
2016
 
2015
Service cost – benefits earned during the year
$
7

 
$
16

 
$
36

 
$
40

Interest cost on projected benefit obligations
455

 
446

 
64

 
66

Expected return on plan assets
(549
)
 
(543
)
 
—

 
—

Amortization of prior service (benefit) cost
—

 
—

 
(6
)
 
13

Amortization of net loss
157

 
191

 
—

 
—

Net periodic benefit cost
$
70

 
$
110

 
$
94

 
$
119