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Components of Net Periodic Benefit Cost (Tables)
 3 Months Ended
Mar. 31, 2015
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, 2015 and 2014 included the following components (in thousands):
 

Three months ended March 31,
 

Pension
benefits

Other post-
retirement
benefits
 

2015

2014

2015

2014
Service cost

$
—

 
—

 
42

 
42

Interest cost

284

 
352

 
281

 
272

Expected return on plan assets

(633
)
 
(894
)
 
—

 
—

Amortization of prior service cost

—

 
—

 
—

 
(1
)
Amortization of the net loss

194

 
93

 
—

 
(51
)
Net periodic benefit (increase) cost

$
(155
)
 
(449
)
 
323

 
262