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BENEFIT PLANS (Tables)
 3 Months Ended
Mar. 31, 2019
BENEFIT PLANS [Abstract]  
Net Periodic Benefit Cost
The net periodic benefit cost for the three months ended March 31, 2019 and 2018 is as follows:


 
Pension Benefits
  
Post-retirement Benefits
 
  
Three Months Ended
March 31,
  
Three Months Ended
March 31,
 
(000's omitted)
 
2019
  
2018
  
2019
  
2018
 
Service cost
 
$
1,270
  
$
1,121
  
$
0
  
$
0
 
Interest cost
  
1,566
   
1,415
   
18
   
17
 
Expected return on plan assets
  
(3,577
)
  
(3,705
)
  
0
   
0
 
Amortization of unrecognized net loss
  
642
   
298
   
9
   
5
 
Amortization of prior service cost
  
16
   
(83
)
  
(45
)
  
(44
)
Net periodic benefit
 
$ 
(83
)
 
$ 
(954
)
 
$ 
(18
)
 
$ 
(22
)