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BENEFIT PLANS (Tables)
 3 Months Ended
Mar. 31, 2017
BENEFIT PLANS [Abstract]  
Net Periodic (Benefit) Cost
The net periodic (benefit) cost for the three months ended March 31, 2017 and 2016 is as follows:

  
Pension Benefits
  
Post-retirement Benefits
 
  
Three Months Ended
March 31,
  
Three Months Ended
March 31,
 
(000's omitted)
 
2017
  
2016
  
2017
  
2016
 
Service cost
 
$
1,039
  
$
1,026
  
$
0
  
$
0
 
Interest cost
  
1,361
   
1,406
   
19
   
20
 
Expected return on plan assets
  
(3,121
)
  
(2,960
)
  
0
   
0
 
Amortization of unrecognized net loss
  
263
   
377
   
2
   
(1
)
Amortization of prior service cost
  
14
   
11
   
(45
)
  
(45
)
Net periodic (benefit) cost
 
$ 
(444
)
 
$ 
(140
)
 
$ 
(24
)
 
$ 
(26
)