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EARNINGS PER SHARE (Tables)
 12 Months Ended
Dec. 31, 2014
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, 2014, 2013 and 2012.

(000's omitted, except per share data)
 
2014
  
2013
  
2012
 
Net income
 
$
91,353
  
$
78,829
  
$
77,068
 
Income attributable to unvested stock-based compensation awards
  
(456
)
  
(433
)
  
(499
)
Income available to common shareholders
 
$
90,897
  
$
78,396
  
$
76,569
 
             
Weighted-average common shares outstanding - basic
  
40,548
   
40,000
   
39,192
 
             
Basic earnings per share
 
$
2.24
  
$
1.96
  
$
1.95
 
             
Net income
 
$
91,353
  
$
78,829
  
$
77,068
 
Income attributable to unvested stock-based compensation awards
  
(456
)
  
(433
)
  
(499
)
Income available to common shareholders
 
$
90,897
  
$
78,396
  
$
76,569
 
             
Weighted-average common shares outstanding
  
40,548
   
40,000
   
39,192
 
Assumed exercise of stock options
  
481
   
504
   
479
 
Weighted-average common shares outstanding – diluted
  
41,029
   
40,504
   
39,671
 
             
Diluted earnings per share
 
$
2.22
  
$
1.94
  
$
1.93
 
Cash dividends declared per share
 
$
1.16
  
$
1.10
  
$
1.06