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EARNINGS PER SHARE (Tables)
 12 Months Ended
Dec. 31, 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 years ended December 31, 2016, 2015 and 2014.

(000's omitted, except per share data)
 
2016
  
2015
  
2014
 
Net income
 
$
103,812
  
$
91,230
  
$
91,353
 
Income attributable to unvested stock-based compensation awards
  
(550
)
  
(453
)
  
(456
)
Income available to common shareholders
 
$
103,262
  
$
90,777
  
$
90,897
 
             
Weighted-average common shares outstanding - basic
  
44,091
   
40,996
   
40,548
 
             
Basic earnings per share
 
$
2.34
  
$
2.21
  
$
2.24
 
             
Net income
 
$
103,812
  
$
91,230
  
$
91,353
 
Income attributable to unvested stock-based compensation awards
  
(550
)
  
(453
)
  
(456
)
Income available to common shareholders
 
$
103,262
  
$
90,777
  
$
90,897
 
             
Weighted-average common shares outstanding
  
44,091
   
40,996
   
40,548
 
Assumed exercise of stock options
  
394
   
405
   
481
 
Weighted-average common shares outstanding – diluted
  
44,485
   
41,401
   
41,029
 
             
Diluted earnings per share
 
$
2.32
  
$
2.19
  
$
2.22
 
Cash dividends declared per share
 
$
1.26
  
$
1.22
  
$
1.16