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EARNINGS PER SHARE (Tables)
 6 Months Ended
Jun. 30, 2020
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 six months ended June 30, 2020 and 2019:

  
Three Months Ended
    
Six Months Ended
  
   
June 30,
    
June 30,
  
(000’s omitted, except per share data)
  
2020
    
2019
    
2020
    
2019
  
Net income
  
$
35,248
    
$
45,015
    
$
75,382
    
$
86,961
  
Income attributable to unvested stock-based compensation awards
    
(127
)
    
(146
)
    
(264
)
    
(255
)
Income available to common shareholders
  
$
35,121
    
$
44,869
    
$
75,118
    
$
86,706
  
                                 
Weighted-average common shares outstanding – basic
    
52,487
      
51,659
      
52,262
      
51,590
  
Basic earnings per share
  
$
0.67
    
$
0.87
    
$
1.44
    
$
1.68
  
                                 
Net income
  
$
35,248
    
$
45,015
    
$
75,382
    
$
86,961
  
Income attributable to unvested stock-based compensation awards
    
(127
)
    
(146
)
    
(264
)
    
(255
)
Income available to common shareholders
  
$
35,121
    
$
44,869
    
$
75,118
    
$
86,706
  
                                 
Weighted-average common shares outstanding – basic
    
52,487
      
51,659
      
52,262
      
51,590
  
Assumed exercise of stock options
    
339
      
529
      
372
      
535
  
Weighted-average common shares outstanding – diluted
    
52,826
      
52,188
      
52,634
      
52,125
  
Diluted earnings per share
  
$
0.66
    
$
0.86
    
$
1.43
    
$
1.66