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Components of Net Periodic Benefit Cost (Tables)
 9 Months Ended
Sep. 30, 2016
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 and nine months ended September 30, 2016 and 2015 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
 

2016

2015

2016

2015

2016

2015

2016

2015
Service cost

$
—

 
—

 
37

 
42

 
$
—

 
—

 
112

 
126

Interest cost

312

 
284

 
285

 
280

 
936

 
852

 
854

 
842

Expected return on plan assets

(612
)
 
(632
)
 
—

 
—

 
(1,836
)
 
(1,898
)
 
—

 
—

Amortization of prior service cost

—

 
—

 
—

 
—

 
—

 
—

 
—

 
—

Amortization of the net loss

236

 
193

 
—

 
—

 
708

 
581

 
—

 
—

Net periodic benefit (increase) cost

$
(64
)
 
(155
)
 
322

 
322

 
$
(192
)
 
(465
)
 
966

 
968