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BENEFIT PLANS (Tables)
 3 Months Ended
Mar. 31, 2016
BENEFIT PLANS [Abstract]  
Net Periodic Benefit Cost
The net periodic benefit cost for the three months ended March 31, 2016 and 2015 is as follows:

  
Pension Benefits
  Post-retirement Benefits 
  
Three Months Ended
March 31,
  
Three Months Ended
March 31,
 
(000's omitted)
 
2016
  
2015
  
2016
  
2015
 
Service cost
 
$
1,026
  
$
831
  
$
0
  
$
0
 
Interest cost
  
1,406
   
1,375
   
20
   
22
 
Expected return on plan assets
  
(2,960
)
  
(3,042
)
  
0
   
0
 
Amortization of unrecognized net loss
  
377
   
366
   
(1
)
  
(3
)
Amortization of prior service cost
  
11
   
2
   
(45
)
  
(45
)
Net periodic benefit cost
 
$ 
(140
)
 
$ 
(468
)
 
$ 
(26
)
 
$ 
(26
)