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EARNINGS PER SHARE (Tables)
 6 Months Ended
Jun. 30, 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 and six months ended June 30, 2012 and 2011.

 
Three Months Ended
June 30,
 
 
Six Months Ended
June 30,
 
(000's omitted, except per share data)
 
2012
 
 
2011
 
 
2012
 
 
2011
 
Net income
 
$
21,071
 
 
$
17,986
 
 
$
39,897
 
 
$
34,146
 
Income attributable to unvested stock-based compensation awards
 
 
(144
)
 
 
(136
)
 
 
(247
)
 
 
(267
)
Income available to common shareholders
 
$
20,927
 
 
$
17,850
 
 
$
39,650
 
 
$
33,879
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Weighted-average common shares outstanding - basic
 
 
39,324
 
 
 
36,346
 
 
 
38,948
 
 
 
34,804
 
Basic earnings per share
 
$
0.53
 
 
$
0.49
 
 
$
1.02
 
 
$
0.97
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Net income
 
$
21,071
 
 
$
17,986
 
 
$
39,897
 
 
$
34,146
 
Income attributable to unvested stock-based compensation awards
 
 
(144
)
 
 
(136
)
 
 
(247
)
 
 
(267
)
Income available to common shareholders
 
$
20,927
 
 
$
17,850
 
 
$
39,650
 
 
$
33,879
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Weighted-average common shares outstanding
 
 
39,324
 
 
 
36,346
 
 
 
38,948
 
 
 
34,804
 
Assumed exercise of stock options
 
 
463
 
 
 
438
 
 
 
501
 
 
 
486
 
Weighted-average shares - diluted
 
 
39,787
 
 
 
36,784
 
 
 
39,449
 
 
 
35,290
 
Diluted earnings per share
 
$
0.53
 
 
$
0.49
 
 
$
1.01
 
 
$
0.96