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BENEFIT PLANS (Tables)
 9 Months Ended
Sep. 30, 2012
BENEFIT PLANS [Abstract]  
Net Periodic Benefit Cost
The Company provides a qualified defined benefit pension to eligible employees and retirees, other post-retirement health and life insurance benefits to certain retirees, an unfunded supplemental pension plan for certain key executives, and an unfunded stock balance plan for certain of its nonemployee directors.  The Company accrues for the estimated cost of these benefits through charges to expense during the years that employees earn these benefits.  The net periodic benefit cost for the three and nine months ended September 30, 2012 and 2011 are 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)
 
2012
  
2011
  
2012
  
2011
  
2012
  
2011
  
2012
  
2011
 
Service cost
 
$
848
  
$
735
  
$
2,544
  
$
2,205
  
$
0
  
$
0
  
$
0
  
$
0
 
Interest cost
  
1,098
   
1,191
   
3,295
   
3,344
   
29
   
38
   
86
   
115
 
Expected return on plan assets
  
(2,299
)
  
(2,167
)
  
(6,897
)
  
(6,101
)
  
0
   
0
   
0
   
0
 
Amortization of unrecognized net loss
  
922
   
474
   
2,765
   
1,422
   
3
   
2
   
9
   
6
 
Amortization of prior service cost
  
(37
)
  
(37
)
  
(110
)
  
(112
)
  
(206
)
  
(264
)
  
(617
)
  
(793
)
Net periodic benefit cost
 
$
532
  
$
196
  
$
1,597
  
$
758
  
$
(174
)
 
$ 
(224
)
 
$ 
(522
)
 
$ 
(672
)