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Components of Net Periodic Benefit Cost (Tables)
 3 Months Ended
Mar. 31, 2018
Retirement Benefits [Abstract]  
Summary of Net Periodic Benefit Cost (Increase)
Net periodic benefit (increase) cost for pension benefits and other post-retirement benefits for the three months ended March 31, 2018 and 2017 includes the following components (in thousands):
 

Three months ended March 31,
 

Pension
benefits

Other post-
retirement
benefits
 

2018

2017

2018

2017
Service cost

$
—

 
—

 
29

 
26

Interest cost

274

 
307

 
197

 
218

Expected return on plan assets

(693
)
 
(638
)
 
—

 
—

Amortization of prior service cost

—

 
—

 
—

 
—

Amortization of net loss (gain)

199

 
230

 
(99
)
 
(169
)
Net periodic benefit (increase) cost

$
(220
)
 
(101
)
 
127

 
75