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EARNINGS PER SHARE (Tables)
 9 Months Ended
Sep. 30, 2017
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, 2017 and 2016:

  
Three Months Ended
September 30,
  
Nine Months Ended
September 30,
 
(000's omitted, except per share data)
 
2017
  
2016
  
2017
  
2016
 
Net income
 
$
35,243
  
$
27,160
  
$
78,691
  
$
77,420
 
Income attributable to unvested stock-based compensation awards
  
(164
)
  
(157
)
  
(387
)
  
(398
)
Income available to common shareholders
 
$
35,079
  
$
27,003
  
$
78,304
  
$
77,022
 
                 
Weighted-average common shares outstanding – basic
  
50,703
   
44,184
   
48,189
   
44,023
 
Basic earnings per share
 
$
0.69
  
$
0.61
  
$
1.62
  
$
1.75
 
                 
Net income
 
$
35,243
  
$
27,160
  
$
78,691
  
$
77,420
 
Income attributable to unvested stock-based compensation awards
  
(164
)
  
(157
)
  
(387
)
  
(398
)
Income available to common shareholders
 
$
35,079
  
$
27,003
  
$
78,304
  
$
77,022
 
                 
Weighted-average common shares outstanding – basic
  
50,703
   
44,184
   
48,189
   
44,023
 
Assumed exercise of stock options
  
585
   
394
   
640
   
359
 
Weighted-average common shares outstanding – diluted
  
51,288
   
44,578
   
48,829
   
44,382
 
Diluted earnings per share
 
$
0.68
  
$
0.61
  
$
1.60
  
$
1.74