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BENEFIT PLANS (Tables)
 6 Months Ended
Jun. 30, 2015
BENEFIT PLANS [Abstract]  
Net Periodic Benefit Cost
The net periodic benefit cost for the three and six months ended June 30, 2015 and 2014 is as follows:
 
  
Pension Benefits
  
Post-retirement Benefits
 
  
Three Months Ended
June 30,
  
Six Months Ended
June 30,
  
Three Months Ended
June 30,
  
Six Months Ended
June 30,
 
(000's omitted)
 
2015
  
2014
  
2015
  
2014
  
2015
  
2014
  
2015
  
2014
 
Service cost
 
$
831
  
$
882
  
$
1,662
  
$
1,765
  
$
0
  
$
0
  
$
0
  
$
0
 
Interest cost
  
1,375
   
1,318
   
2,749
   
2,635
   
22
   
24
   
43
   
51
 
Expected return on plan assets
  
(3,042
)
  
(2,980
)
  
(6,085
)
  
(5,961
)
  
0
   
0
   
0
   
0
 
Amortization of unrecognized net loss
  
366
   
(77
)
  
733
   
(153
)
  
(3
)
  
(3
)
  
(6
)
  
(3
)
Amortization of prior service cost
  
2
   
1
   
4
   
2
   
(45
)
  
(45
)
  
(89
)
  
(90
)
Net periodic benefit cost
 
$ 
(468
)
 
$ 
(856
)
 
$ 
(937
)
 
$ 
(1,712
)
 
$ 
(26
)
 
$ 
(24
)
 
$ 
(52
)
 
$ 
(42
)