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Defined Benefit Postretirement Plans (Tables)
 9 Months Ended
Sep. 30, 2015
Defined Benefit Postretirement Plans [Abstract]  
Components of Net Periodic Pension Benefits and Other Benefit Costs
The components of expense for Pension Benefits and Other Benefits are set forth below (in thousands):
 
 
 
Pension Benefits
  
Other Benefits
 
 
 
Three months ended September 30,
  
Three months ended September 30,
 
Components of net periodic (benefit) cost:
 
2015
  
2014
  
2015
  
2014
 
Service cost
 
$
669
  
$
587
  
$
4
  
$
4
 
Interest cost
  
996
   
1,040
   
101
   
90
 
Expected return on plan assets
  
(2,147
)
  
(2,175
)
  
-
   
-
 
Net amortization
  
550
   
25
   
1
   
(6
)
Total cost (benefit)
 
$
68
  
$
(523
)
 
$
106
  
$
88
 

 
 
Pension Benefits
  
Other Benefits
 
 
 
Nine months ended September 30,
  
Nine months ended September 30,
 
Components of net periodic (benefit) cost:
 
2015
  
2014
  
2015
  
2014
 
Service cost
 
$
1,979
  
$
1,761
  
$
12
  
$
12
 
Interest cost
  
2,992
   
3,120
   
283
   
270
 
Expected return on plan assets
  
(6,447
)
  
(6,525
)
  
-
   
-
 
Net amortization
  
1,642
   
75
   
31
   
(18
)
Total cost (benefit)
 
$
166
  
$
(1,569
)
 
$
326
  
$
264