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EARNINGS PER SHARE (Tables)
 12 Months Ended
Dec. 31, 2013
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, 2013, 2012 and 2011.

(000's omitted, except per share data)
 
2013
  
2012
  
2011
 
Net income
 
$
78,829
  
$
77,068
  
$
73,142
 
Income attributable to unvested stock-based compensation awards
  
(433
)
  
(499
)
  
(553
)
Income available to common shareholders
 
$
78,396
  
$
76,569
  
$
72,589
 
             
Weighted-average common shares outstanding - basic
  
40,000
   
39,192
   
35,767
 
             
Basic earnings per share
 
$
1.96
  
$
1.95
  
$
2.03
 
             
Net income
 
$
78,829
  
$
77,068
  
$
73,142
 
Income attributable to unvested stock-based compensation awards
  
(433
)
  
(499
)
  
(553
)
Income available to common shareholders
 
$
78,396
  
$
76,569
  
$
72,589
 
             
Weighted-average common shares outstanding
  
40,000
   
39,192
   
35,767
 
Assumed exercise of stock options
  
504
   
479
   
415
 
Weighted-average common shares outstanding – diluted
  
40,504
   
39,671
   
36,182
 
             
Diluted earnings per share
 
$
1.94
  
$
1.93
  
$
2.01
 
Cash dividends declared per share
 
$
1.10
  
$
1.06
  
$
1.00