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EARNINGS PER SHARE (Tables)
 9 Months Ended
Sep. 30, 2016
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, 2016 and 2015:

  
Three Months Ended
  
Nine Months Ended
 
  
September 30,
  
September 30,
 
(000's omitted, except per share data)
 
2016
  
2015
  
2016
  
2015
 
Net income
 
$
27,160
  
$
25,022
  
$
77,420
  
$
71,159
 
Income attributable to unvested stock-based compensation awards
  
(157
)
  
(129
)
  
(398
)
  
(352
)
Income available to common shareholders
 
$
27,003
  
$
24,893
  
$
77,022
  
$
70,807
 
                 
Weighted-average common shares outstanding – basic
  
44,184
   
40,873
   
44,023
   
40,741
 
Basic earnings per share
 
$
0.61
  
$
0.61
  
$
1.75
  
$
1.74
 
                 
Net income
 
$
27,160
  
$
25,022
  
$
77,420
  
$
71,159
 
Income attributable to unvested stock-based compensation awards
  
(157
)
  
(129
)
  
(398
)
  
(352
)
Income available to common shareholders
 
$
27,003
  
$
24,893
  
$
77,022
  
$
70,807
 
                 
Weighted-average common shares outstanding – basic
  
44,184
   
40,873
   
44,023
   
40,741
 
Assumed exercise of stock options
  
394
   
386
   
359
   
400
 
Weighted-average common shares outstanding – diluted
  
44,578
   
41,259
   
44,382
   
41,141
 
Diluted earnings per share
 
$
0.61
  
$
0.60
  
$
1.74
  
$
1.72