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EARNINGS PER SHARE (Tables)
 6 Months Ended
Jun. 30, 2017
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, 2017 and 2016:

  
Three Months Ended
 June 30,
  
Six Months Ended
 June 30,
 
(000's omitted, except per share data)
 
2017
  
2016
  
2017
  
2016
 
Net income
 
$
17,191
  
$
25,857
  
$
43,448
  
$
50,260
 
Income attributable to unvested stock-based compensation awards
  
(83
)
  
(151
)
  
(219
)
  
(242
)
Income available to common shareholders
 
$
17,108
  
$
25,706
  
$
43,229
  
$
50,018
 
                 
Weighted-average common shares outstanding – basic
  
48,525
   
44,021
   
46,913
   
43,942
 
Basic earnings per share
 
$
0.35
  
$
0.58
  
$
0.92
  
$
1.14
 
                 
Net income
 
$
17,191
  
$
25,857
  
$
43,448
  
$
50,260
 
Income attributable to unvested stock-based compensation awards
  
(83
)
  
(151
)
  
(219
)
  
(242
)
Income available to common shareholders
 
$
17,108
  
$
25,706
  
$
43,229
  
$
50,018
 
                 
Weighted-average common shares outstanding – basic
  
48,525
   
44,021
   
46,913
   
43,942
 
Assumed exercise of stock options
  
626
   
357
   
665
   
347
 
Weighted-average common shares outstanding – diluted
  
49,151
   
44,378
   
47,578
   
44,289
 
Diluted earnings per share
 
$
0.35
  
$
0.58
  
$
0.91
  
$
1.13