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BENEFIT PLANS (Tables)
 9 Months Ended
Sep. 30, 2018
BENEFIT PLANS [Abstract]  
Net Periodic Benefit Cost
The net periodic benefit cost for the three and nine months ended September 30, 2018 and 2017 is as follows:

  
Pension Benefits
  
Post-retirement Benefits
 
  
Three Months Ended
September 30,
  
Nine Months Ended
September 30,
  
Three Months Ended
September 30,
  
Nine Months Ended
September 30,
 
(000's omitted)
 
2018
  
2017
  
2018
  
2017
  
2018
  
2017
  
2018
  
2017
 
Service cost
 
$
1,154
  
$
1,037
  
$
3,396
  
$
3,143
  
$
0
  
$
0
  
$
0
  
$
0
 
Interest cost
  
1,422
   
1,453
   
4,251
   
4,265
   
18
   
19
   
52
   
57
 
Expected return on plan assets
  
(3,705
)
  
(3,448
)
  
(11,115
)
  
(9,977
)
  
0
   
0
   
0
   
0
 
Amortization of unrecognized net loss
  
299
   
148
   
895
   
619
   
5
   
2
   
15
   
6
 
Amortization of prior service cost
  
(60
)
  
13
   
(225
)
  
43
   
(45
)
  
(45
)
  
(134
)
  
(134
)
Net periodic benefit cost (income)
 
$ 
(890
)
 
$ 
(797
)
 
$ 
(2,798
)
 
$ 
(1,907
)
 
$ 
(22
)
 
$ 
(24
)
 
$ 
(67
)
 
$ 
(71
)