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Components of Net Periodic Benefit Cost (Tables)
 3 Months Ended
Mar. 31, 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 months ended March 31, 2016 and 2015 includes the following components (in thousands):
 

Three months ended March 31,
 

Pension
benefits

Other post-
retirement
benefits
 

2016

2015

2016

2015
Service cost

$
—

 
—

 
38

 
42

Interest cost

312

 
284

 
284

 
281

Expected return on plan assets

(612
)
 
(633
)
 
—

 
—

Amortization of prior service cost

—

 
—

 
—

 
—

Amortization of the net loss

236

 
194

 
—

 
—

Net periodic benefit (increase) cost

$
(64
)
 
(155
)
 
322

 
323