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EARNINGS PER SHARE (Tables)
 12 Months Ended
Dec. 31, 2012
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, 2012, 2011 and 2010.

(000's omitted, except per share data)
 
2012
 
 
2011
 
 
2010
 
Net income
 
$
77,068
 
 
$
73,142
 
 
$
63,320
 
Income attributable to unvested stock-based compensation awards
 
 
(499
)
 
 
(553
)
 
 
(542
)
Income available to common shareholders
 
$
76,569
 
 
$
72,589
 
 
$
62,778
 
 
 
 
 
 
 
 
 
 
 
 
 
Weighted-average common shares outstanding - basic
 
 
39,192
 
 
 
35,767
 
 
 
32,951
 
 
 
 
 
 
 
 
 
 
 
 
 
Basic earnings per share
 
$
1.95
 
 
$
2.03
 
 
$
1.91
 
 
 
 
 
 
 
 
 
 
 
 
 
Net income
 
$
77,068
 
 
$
73,142
 
 
$
63,320
 
Income attributable to unvested stock-based compensation awards
 
 
(499
)
 
 
(553
)
 
 
(542
)
Income available to common shareholders
 
$
76,569
 
 
$
72,589
 
 
$
62,778
 
 
 
 
 
 
 
 
 
 
 
 
 
Weighted-average common shares outstanding
 
 
39,192
 
 
 
35,767
 
 
 
32,951
 
Assumed exercise of stock options
 
 
479
 
 
 
415
 
 
 
318
 
Weighted-average common shares outstanding – diluted
 
 
39,671
 
 
 
36,182
 
 
 
33,269
 
 
 
 
 
 
 
 
 
 
 
 
 
Diluted earnings per share
 
$
1.93
 
 
$
2.01
 
 
$
1.89