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EARNINGS PER SHARE (Tables)
 3 Months Ended
Mar. 31, 2015
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, 2015 and 2014:

  
Three Months Ended
 
  
March 31,
 
(000's omitted, except per share data)
 
2015
  
2014
 
Net income
 
$
22,297
  
$
22,173
 
Income attributable to unvested stock-based compensation awards
  
(100
)
  
(99
)
Income available to common shareholders
  
22,197
  
$
22,074
 
         
Weighted-average common shares outstanding – basic
  
40,659
   
40,458
 
Basic earnings per share
 
$
0.55
  
$
0.55
 
         
Net income
 
$
22,297
  
$
22,173
 
Income attributable to unvested stock-based compensation awards
  
(100
)
  
(99
)
Income available to common shareholders
  
22,197
  
$
22,074
 
         
Weighted-average common shares outstanding – basic
  
40,659
   
40,458
 
Assumed exercise of stock options
  
405
   
512
 
Weighted-average common shares outstanding – diluted
  
41,064
   
40,970
 
Diluted earnings per share
 
$
0.54
  
$
0.54