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EARNINGS PER SHARE (Tables)
 6 Months Ended
Jun. 30, 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 and six months ended June 30, 2015 and 2014:

  
Three Months Ended
June 30,
  
Six Months Ended
June 30,
 
(000's omitted, except per share data)
 
2015
  
2014
  
2015
  
2014
 
Net income
 
$
23,840
  
$
23,676
  
$
46,137
  
$
45,850
 
Income attributable to unvested stock-based compensation awards
  
(99
)
  
(123
)
  
(177
)
  
(221
)
Income available to common shareholders
 
$
23,741
  
$
23,553
  
$
45,960
  
$
45,629
 
                 
Weighted-average common shares outstanding – basic
  
40,690
   
40,574
   
40,674
   
40,517
 
Basic earnings per share
 
$
0.58
  
$
0.58
  
$
1.13
  
$
1.13
 
                 
Net income
 
$
23,840
  
$
23,676
  
$
46,137
  
$
45,850
 
Income attributable to unvested stock-based compensation awards
  
(99
)
  
(123
)
  
(177
)
  
(221
)
Income available to common shareholders
 
$
23,741
  
$
23,553
  
$
45,960
  
$
45,629
 
                 
Weighted-average common shares outstanding – basic
  
40,690
   
40,574
   
40,674
   
40,517
 
Assumed exercise of stock options
  
404
   
484
   
405
   
497
 
Weighted-average common shares outstanding – diluted
  
41,094
   
41,058
   
41,079
   
41,014
 
Diluted earnings per share
 
$
0.58
  
$
0.57
  
$
1.12
  
$
1.11