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BENEFIT PLANS (Tables)
 3 Months Ended
Mar. 31, 2015
BENEFIT PLANS [Abstract]  
Net Periodic Benefit Cost
The net periodic benefit cost for the three months ended March 31, 2015 and 2014 is as follows:
 
  
Pension Benefits
  Post-retirement Benefits 
  
Three Months Ended
  
Three Months Ended
 
  
March 31,
  
March 31,
 
(000's omitted)
 
2015
  
2014
  
2015
  
2014
 
Service cost
 
$
831
  
$
882
  
$
0
  
$
0
 
Interest cost
  
1,375
   
1,318
   
22
   
27
 
Expected return on plan assets
  
(3,042
)
  
(2,980
)
  
0
   
0
 
Amortization of unrecognized net loss
  
366
   
(77
)
  
(3
)
  
0
 
Amortization of prior service cost
  
2
   
1
   
(45
)
  
(45
)
Net periodic benefit cost
 
$ 
(468
)
 
$ 
(856
)
 
$ 
(26
)
 
$ 
(18
)