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EARNINGS PER SHARE (Tables)
 6 Months Ended
Jun. 30, 2018
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, 2018 and 2017:

  
Three Months Ended
June 30,
  
Six Months Ended
June 30,
 
(000’s omitted, except per share data)
 
2018
  
2017
  
2018
  
2017
 
Net income
 
$
44,606
  
$
17,191
  
$
84,712
  
$
43,448
 
Income attributable to unvested stock-based compensation awards
  
(188
)
  
(83
)
  
(353
)
  
(219
)
Income available to common shareholders
 
$
44,418
  
$
17,108
  
$
84,359
  
$
43,229
 
                 
Weighted-average common shares outstanding – basic
  
51,140
   
48,525
   
51,037
   
46,913
 
Basic earnings per share
 
$
0.87
  
$
0.35
  
$
1.65
  
$
0.92
 
                 
Net income
 
$
44,606
  
$
17,191
  
$
84,712
  
$
43,448
 
Income attributable to unvested stock-based compensation awards
  
(188
)
  
(83
)
  
(353
)
  
(219
)
Income available to common shareholders
 
$
44,418
  
$
17,108
  
$
84,359
  
$
43,229
 
                 
Weighted-average common shares outstanding – basic
  
51,140
   
48,525
   
51,037
   
46,913
 
Assumed exercise of stock options
  
583
   
626
   
576
   
665
 
Weighted-average common shares outstanding – diluted
  
51,723
   
49,151
   
51,613
   
47,578
 
Diluted earnings per share
 
$
0.86
  
$
0.35
  
$
1.63
  
$
0.91