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EARNINGS PER SHARE (Tables)
 3 Months Ended
Mar. 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 three months ended March 31, 2016 and 2015:

  
Three Months Ended
March 31,
 
(000's omitted, except per share data)
 
2016
  
2015
 
Net income
 
$
24,403
  
$
22,297
 
Income attributable to unvested stock-based compensation awards
  
(89
)
  
(100
)
Income available to common shareholders
 
$
24,314
  
$
22,197
 
         
Weighted-average common shares outstanding – basic
  
43,863
   
40,659
 
Basic earnings per share
 
$
0.55
  
$
0.55
 
         
Net income
 
$
24,403
  
$
22,297
 
Income attributable to unvested stock-based compensation awards
  
(89
)
  
(100
)
Income available to common shareholders
 
$
24,314
  
$
22,197
 
         
Weighted-average common shares outstanding – basic
  
43,863
   
40,659
 
Assumed exercise of stock options
  
333
   
405
 
Weighted-average common shares outstanding – diluted
  
44,196
   
41,064
 
Diluted earnings per share
 
$
0.55
  
$
0.54