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EARNINGS PER SHARE (Tables)
 6 Months Ended
Jun. 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 six months ended June 30, 2019 and 2018:


 
Three Months Ended
June 30,
    
Six Months Ended
June 30,
  
(000's omitted, except per share data)
  
2019
    
2018
    
2019
    
2018
  
Net income
  
$
45,015
    
$
44,606
    
$
86,961
    
$
84,712
  
Income attributable to unvested stock-based compensation awards
    
(146
)
    
(188
)
    
(255
)
    
(353
)
Income available to common shareholders
  
$
44,869
    
$
44,418
    
$
86,706
    
$
84,359
  
                                 
Weighted-average common shares outstanding – basic
    
51,659
      
51,140
      
51,590
      
51,037
  
Basic earnings per share
  
$
0.87
    
$
0.87
    
$
1.68
    
$
1.65
  
                                 
Net income
  
$
45,015
    
$
44,606
    
$
86,961
    
$
84,712
  
Income attributable to unvested stock-based compensation awards
    
(146
)
    
(188
)
    
(255
)
    
(353
)
Income available to common shareholders
  
$
44,869
    
$
44,418
    
$
86,706
    
$
84,359
  
                                 
Weighted-average common shares outstanding – basic
    
51,659
      
51,140
      
51,590
      
51,037
  
Assumed exercise of stock options
    
529
      
583
      
535
      
576
  
Weighted-average common shares outstanding – diluted
    
52,188
      
51,723
      
52,125
      
51,613
  
Diluted earnings per share
  
$
0.86
    
$
0.86
    
$
1.66
    
$
1.63