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EARNINGS PER SHARE (Tables)
 3 Months Ended
Mar. 31, 2018
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, 2018 and 2017:

  
Three Months Ended
March 31,
 
(000's omitted, except per share data)
 
2018
  
2017
 
Net income
 
$
40,106
  
$
26,257
 
Income attributable to unvested stock-based compensation awards
  
(141
)
  
(138
)
Income available to common shareholders
 
$
39,965
  
$
26,119
 
         
Weighted-average common shares outstanding – basic
  
50,934
   
45,284
 
Basic earnings per share
 
$
0.78
  
$
0.58
 
         
Net income
 
$
40,106
  
$
26,257
 
Income attributable to unvested stock-based compensation awards
  
(141
)
  
(138
)
Income available to common shareholders
 
$
39,965
  
$
26,119
 
         
Weighted-average common shares outstanding – basic
  
50,934
   
45,284
 
Assumed exercise of stock options
  
563
   
703
 
Weighted-average common shares outstanding – diluted
  
51,497
   
45,987
 
Diluted earnings per share
 
$
0.78
  
$
0.57