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Defined Benefit Postretirement Plans (Tables)
 3 Months Ended
Mar. 31, 2016
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 March 31,
 
Three months ended March 31,
 
Components of net periodic cost (benefit):
2016
 
2015
 
2016
 
2015
 
Service cost
 
$
560
  
$
655
  
$
4
  
$
4
 
Interest cost
  
1,051
   
998
   
94
   
91
 
Expected return on plan assets
  
(1,835
)
  
(2,150
)
  
-
   
-
 
Net amortization
  
483
   
546
   
29
   
15
 
Total cost (benefit)
 
$
259
  
$
49
  
$
127
  
$
110