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EARNINGS PER SHARE (Tables)
 9 Months Ended
Sep. 30, 2019
EARNINGS PER SHARE [Abstract]  
Reconciliation of Basic to Diluted Earnings per Share The following is a reconciliation of basic to diluted earnings per share for the three and nine months ended September 30, 2019 and 2018:


 
Three Months Ended
    
Nine Months Ended
  
   
September 30,
    
September 30,
  
(000's omitted, except per share data)
  
2019
    
2018
    
2019
    
2018
  
Net income
  
$
39,218
    
$
43,106
    
$
126,179
    
$
127,818
  
Income attributable to unvested stock-based compensation awards
    
(102
)
    
(191
)
    
(331
)
    
(563
)
Income available to common shareholders
  
$
39,116
    
$
42,915
    
$
125,848
    
$
127,255
  
                                 
Weighted-average common shares outstanding – basic
    
51,750
      
51,250
      
51,644
      
51,108
  
Basic earnings per share
  
$
0.76
    
$
0.84
    
$
2.44
    
$
2.49
  
                                 
Net income
  
$
39,218
    
$
43,106
    
$
126,179
    
$
127,818
  
Income attributable to unvested stock-based compensation awards
    
(102
)
    
(191
)
    
(331
)
    
(563
)
Income available to common shareholders
  
$
39,116
    
$
42,915
    
$
125,848
    
$
127,255
  
                                 
Weighted-average common shares outstanding – basic
    
51,750
      
51,250
      
51,644
      
51,108
  
Assumed exercise of stock options
    
496
      
608
      
522
      
590
  
Weighted-average common shares outstanding – diluted
    
52,246
      
51,858
      
52,166
      
51,698
  
Diluted earnings per share
  
$
0.75
    
$
0.83
    
$
2.41
    
$
2.46