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BENEFIT PLANS (Tables)
 9 Months Ended
Sep. 30, 2015
BENEFIT PLANS [Abstract]  
Net Periodic Benefit Cost
The net periodic benefit cost for the three and nine months ended September 30, 2015 and 2014 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)
 
2015
  
2014
  
2015
  
2014
  
2015
  
2014
  
2015
  
2014
 
Service cost
 
$
831
  
$
882
  
$
2,493
  
$
2,647
  
$
0
  
$
0
  
$
0
  
$
0
 
Interest cost
  
1,375
   
1,318
   
4,124
   
3,953
   
22
   
26
   
65
   
76
 
Expected return on plan assets
  
(3,042
)
  
(2,980
)
  
(9,127
)
  
(8,941
)
  
0
   
0
   
0
   
0
 
Amortization of unrecognized net loss
  
366
   
(77
)
  
1,099
   
(230
)
  
(3
)
  
(2
)
  
(10
)
  
(5
)
Amortization of prior service cost
  
2
   
1
   
6
   
4
   
(45
)
  
(45
)
  
(134
)
  
(134
)
Net periodic benefit income
 
$ 
(468
)
 
$ 
(856
)
 
$ 
(1,405
)
 
$ 
(2,567
)
 
$ 
(26
)
 
$ 
(21
)
 
$ 
(79
)
 
$ 
(63
)