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Components of Net Periodic Benefit Cost (Tables)
 3 Months Ended
Mar. 31, 2017
Compensation and Retirement Disclosure [Abstract]  
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, 2017 and 2016 includes the following components (in thousands):
 

Three months ended March 31,
 

Pension
benefits

Other post-
retirement
benefits
 

2017

2016

2017

2016
Service cost

$
—

 
—

 
26

 
38

Interest cost

307

 
312

 
218

 
284

Expected return on plan assets

(638
)
 
(612
)
 
—

 
—

Amortization of prior service cost

—

 
—

 
—

 
—

Amortization of the net loss (gain)

230

 
236

 
(169
)
 
—

Net periodic benefit (increase) cost

$
(101
)
 
(64
)
 
75

 
322