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EARNINGS PER SHARE (Tables)
 9 Months Ended
Sep. 30, 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 and nine months ended September 30, 2018 and 2017:

  
Three Months Ended
September 30,
  
Nine Months Ended
September 30,
 
(000's omitted, except per share data)
 
2018
  
2017
  
2018
  
2017
 
Net income
 
$
43,106
  
$
35,243
  
$
127,818
  
$
78,691
 
Income attributable to unvested stock-based compensation awards
  
(191
)
  
(164
)
  
(563
)
  
(387
)
Income available to common shareholders
 
$
42,915
  
$
35,079
  
$
127,255
  
$
78,304
 
                 
Weighted-average common shares outstanding – basic
  
51,250
   
50,703
   
51,108
   
48,189
 
Basic earnings per share
 
$
0.84
  
$
0.69
  
$
2.49
  
$
1.62
 
                 
Net income
 
$
43,106
  
$
35,243
  
$
127,818
  
$
78,691
 
Income attributable to unvested stock-based compensation awards
  
(191
)
  
(164
)
  
(563
)
  
(387
)
Income available to common shareholders
 
$
42,915
  
$
35,079
  
$
127,255
  
$
78,304
 
                 
Weighted-average common shares outstanding – basic
  
51,250
   
50,703
   
51,108
   
48,189
 
Assumed exercise of stock options
  
608
   
585
   
590
   
640
 
Weighted-average common shares outstanding – diluted
  
51,858
   
51,288
   
51,698
   
48,829
 
Diluted earnings per share
 
$
0.83
  
$
0.68
  
$
2.46
  
$
1.60