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BENEFIT PLANS (Tables)
 9 Months Ended
Sep. 30, 2016
BENEFIT PLANS [Abstract]  
Net Periodic Benefit Cost
The net periodic benefit cost for the three and nine months ended September 30, 2016 and 2015 is as follows:

  
Pension Benefits
  
Post-retirement Benefits
 
  
Three Months Ended
  
Nine Months Ended
  
Three Months Ended
  
Nine Months Ended
 
  
September 30,
  
September 30,
  
September 30,
  
September 30,
 
(000's omitted)
 
2016
  
2015
  
2016
  
2015
  
2016
  
2015
  
2016
  
2015
 
Service cost
 
$
1,027
  
$
831
  
$
3,079
  
$
2,493
  
$
0
  
$
0
  
$
0
  
$
0
 
Interest cost
  
1,406
   
1,375
   
4,218
   
4,124
   
20
   
22
   
61
   
65
 
Expected return on plan assets
  
(2,961
)
  
(3,042
)
  
(8,882
)
  
(9,127
)
  
0
   
0
   
0
   
0
 
Amortization of
unrecognized net loss/(gain)
  
377
   
366
   
1,131
   
1,099
   
(1
)
  
(3
)
  
(4
)
  
(10
)
Amortization of
prior service cost/(credit)
  
11
   
2
   
33
   
6
   
(45
)
  
(45
)
  
(134
)
  
(134
)
Net periodic benefit cost
 
$ 
(140
)
 
$ 
(468
)
 
$ 
(421
)
 
$ 
(1,405
)
 
$ 
(26
)
 
$ 
(26
)
 
$ 
(77
)
 
$ 
(79
)