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EARNINGS PER SHARE (Tables)
 3 Months Ended
Mar. 31, 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 months ended March 31, 2019 and 2018:

  
Three Months Ended
March 31,
 
(000's omitted, except per share data)
 
2019
  
2018
 
Net income
 
$
41,946
  
$
40,106
 
Income attributable to unvested stock-based compensation awards
  
(109
)
  
(141
)
Income available to common shareholders
 
$
41,837
  
$
39,965
 
         
Weighted-average common shares outstanding – basic
  
51,520
   
50,934
 
Basic earnings per share
 
$
0.81
  
$
0.78
 
         
Net income
 
$
41,946
  
$
40,106
 
Income attributable to unvested stock-based compensation awards
  
(109
)
  
(141
)
Income available to common shareholders
 
$
41,837
  
$
39,965
 
         
Weighted-average common shares outstanding
  
51,520
   
50,934
 
Assumed exercise of stock options
  
541
   
563
 
Weighted-average common shares outstanding – diluted
  
52,061
   
51,497
 
Diluted earnings per share
 
$
0.80
  
$
0.78