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EARNINGS PER SHARE (Tables)
 3 Months Ended
Mar. 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 three months ended March 31, 2012 and 2011.

 
Three Months Ended
March 31,
 
(000's omitted, except per share data)
 
2012
 
 
2011
 
Net income
 
$
18,826
 
 
$
16,160
 
Income attributable to unvested stock-based compensation awards
 
 
(104
)
 
 
(131
)
Income available to common shareholders
 
 
18,722
 
 
 
16,029
 
 
 
 
 
 
 
 
 
Weighted-average common shares outstanding - basic
 
 
38,573
 
 
 
33,245
 
Basic earnings per share
 
$
0.49
 
 
$
0.48
 
 
 
 
 
 
 
 
 
Net income
 
$
18,826
 
 
$
16,160
 
Income attributable to unvested stock-based compensation awards
 
 
(104
)
 
 
(131
)
Income available to common shareholders
 
 
18,722
 
 
 
16,029
 
 
 
 
 
 
 
 
 
Weighted-average common shares outstanding
 
 
38,573
 
 
 
33,245
 
Assumed exercise of stock options
 
 
535
 
 
 
472
 
Weighted-average shares - diluted
 
 
39,108
 
 
 
33,717
 
Diluted earnings per share
 
$
0.48
 
 
$
0.48