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Components of Net Periodic Benefit Cost (Tables)
 3 Months Ended
Mar. 31, 2014
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, 2014 and 2013 includes the following components (in thousands):
 

Three months ended March 31,
 

Pension
benefits

Other post-
retirement
benefits
 

2014

2013

2014

2013
Service cost

$
—

 
—

 
42

 
60

Interest cost

352

 
318

 
272

 
245

Expected return on plan assets

(894
)
 
(792
)
 
—

 
—

Amortization of prior service cost

—

 
—

 
(1
)
 
(1
)
Amortization of the net loss (gain)

93

 
338

 
(51
)
 
4

Net periodic benefit (increase) cost

$
(449
)
 
(136
)
 
262

 
308