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Defined Benefit Post-Retirement Plans (Tables)
6 Months Ended
Jun. 30, 2018
Defined Benefit Post-Retirement Plans [Abstract]  
Net Periodic Pension Benefits and Other Benefit Costs
The components of expense for Pension Benefits and Other Benefits are set forth below:

 
 
Pension Benefits
  
Other Benefits
 
  
Three months ended June 30,
  
Three months ended June 30,
 
(In thousands)
 
2018
  
2017
  
2018
  
2017
 
Components of net periodic (benefit) cost:
            
Service cost
 
$
420
  
$
402
  
$
3
  
$
3
 
Interest cost
  
920
   
1,042
   
82
   
86
 
Expected return on plan assets
  
(2,123
)
  
(1,985
)
  
-
   
-
 
Net amortization
  
251
   
415
   
44
   
20
 
Total net periodic (benefit) cost
 
$
(532
)
 
$
(126
)
 
$
129
  
$
109
 

 
 
Pension Benefits
  
Other Benefits
 
  
Six months ended June 30,
  
Six months ended June 30,
 
(In thousands)
 
2018
  
2017
  
2018
  
2017
 
Components of net periodic (benefit) cost:
            
Service cost
 
$
840
  
$
801
  
$
6
  
$
6
 
Interest cost
  
1,840
   
2,084
   
164
   
172
 
Expected return on plan assets
  
(4,246
)
  
(3,970
)
  
-
   
-
 
Net amortization
  
502
   
830
   
88
   
40
 
Total net periodic (benefit) cost
 
$
(1,064
)
 
$
(255
)
 
$
258
  
$
218