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Components of Net Periodic Benefit Cost (Tables)
 9 Months Ended
Sep. 30, 2017
Retirement Benefits [Abstract]  
Net Periodic Benefit Cost (Increase)
Net periodic (increase) benefit cost for pension benefits and other post-retirement benefits for the three and nine months ended September 30, 2017 and 2016 includes the following components (in thousands):
 

Three months ended September 30,

Nine months ended September 30,
 

Pension
benefits

Other post-
retirement
benefits

Pension
benefits

Other post-
retirement
benefits
 

2017

2016

2017

2016

2017

2016

2017

2016
Service cost

$
—

 
—

 
26

 
37

 
$
—

 
—

 
78

 
112

Interest cost

306

 
312

 
218

 
285

 
920

 
936

 
654

 
854

Expected return on plan assets

(637
)
 
(612
)
 
—

 
—

 
(1,913
)
 
(1,836
)
 
—

 
—

Amortization of prior service cost

—

 
—

 
—

 
—

 
—

 
—

 
—

 
—

Amortization of the net loss

230

 
236

 
(169
)
 
—

 
690

 
708

 
(507
)
 
—

Net periodic (increase) benefit cost

$
(101
)
 
(64
)
 
75

 
322

 
$
(303
)
 
(192
)
 
225

 
966