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Defined Benefit Post-retirement Plans (Tables)
6 Months Ended
Jun. 30, 2017
Defined Benefit Post-retirement 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:

 
 
Pension Benefits
  
Other Benefits
 
(In thousands)
 
Three months ended June 30,
  
Three months ended June 30,
 
Components of net periodic (benefit) cost:
 
2017
  
2016
  
2017
  
2016
 
Service cost
 
$
402
  
$
560
  
$
3
  
$
4
 
Interest cost
  
1,042
   
1,051
   
86
   
94
 
Expected return on plan assets
  
(1,985
)
  
(1,835
)
  
-
   
-
 
Net amortization
  
415
   
483
   
20
   
29
 
Total (benefit) cost
 
$
(126
)
 
$
259
  
$
109
  
$
127
 

 
 
Pension Benefits
  
Other Benefits
 
 
Six months ended June 30,
  
Six months ended June 30,
 
Components of net periodic (benefit) cost:
 
2017
  
2016
  
2017
  
2016
 
Service cost
 
$
804
  
$
1,120
  
$
6
  
$
8
 
Interest cost
  
2,084
   
2,102
   
172
   
188
 
Expected return on plan assets
  
(3,970
)
  
(3,670
)
  
-
   
-
 
Net amortization
  
831
   
966
   
40
   
58
 
Total (benefit) cost
 
$
(251
)
 
$
518
  
$
218
  
$
254