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BENEFIT PLANS (Tables)
 9 Months Ended
Sep. 30, 2017
BENEFIT PLANS [Abstract]  
Net Periodic Benefit Cost
The net periodic benefit cost for the three and nine months ended September 30, 2017 and 2016 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)
 
2017
  
2016
  
2017
  
2016
  
2017
  
2016
  
2017
  
2016
 
Service cost
 
$
1,037
  
$
1,027
  
$
3,143
  
$
3,079
  
$
0
  
$
0
  
$
0
  
$
0
 
Interest cost
  
1,453
   
1,406
   
4,265
   
4,218
   
19
   
20
   
57
   
61
 
Expected return on plan assets
  
(3,448
)
  
(2,961
)
  
(9,977
)
  
(8,882
)
  
0
   
0
   
0
   
0
 
Amortization of unrecognized net loss
  
148
   
377
   
619
   
1,131
   
2
   
(1
)
  
6
   
(4
)
Amortization of prior service cost
  
13
   
11
   
43
   
33
   
(45
)
  
(45
)
  
(134
)
  
(134
)
Net periodic benefit cost (income)
 
$ 
(797
)
 
$ 
(140
)
 
$ 
(1,907
)
 
$ 
(421
)
 
$ 
(24
)
 
$ 
(26
)
 
$ 
(71
)
 
$ 
(77
)