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EARNINGS PER SHARE (Tables)
 12 Months Ended
Dec. 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 years ended December 31, 2018, 2017 and 2016.

(000’s omitted, except per share data)
 
2018
  
2017
  
2016
 
Net income
 
$
168,641
  
$
150,717
  
$
103,812
 
Income attributable to unvested stock-based compensation awards
  
(744
)
  
(597
)
  
(550
)
Income available to common shareholders
 
$
167,897
  
$
150,120
  
$
103,262
 
             
Weighted-average common shares outstanding - basic
  
51,165
   
48,843
   
44,091
 
             
Basic earnings per share
 
$
3.28
  
$
3.07
  
$
2.34
 
             
Net income
 
$
168,641
  
$
150,717
  
$
103,812
 
Income attributable to unvested stock-based compensation awards
  
(744
)
  
(597
)
  
(550
)
Income available to common shareholders
 
$
167,897
  
$
150,120
  
$
103,262
 
             
Weighted-average common shares outstanding
  
51,165
   
48,843
   
44,091
 
Assumed exercise of stock options
  
583
   
627
   
394
 
Weighted-average common shares outstanding – diluted
  
51,748
   
49,470
   
44,485
 
             
Diluted earnings per share
 
$
3.24
  
$
3.03
  
$
2.32
 
Cash dividends declared per share
 
$
1.44
  
$
1.32
  
$
1.26