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Note 5. Earnings Per Common Share (Tables)
 3 Months Ended
Mar. 31, 2012
Schedule of Calculation of Numerator and Denominator in Earnings Per Share [Table Text Block]
   
Three Months Ended
March 31,
   
2012
 
2011
Numerator
       
Net income
 
$
12,572
   
$
43,357
 
Preferred stock dividends
 
(138
)
 
(138
)
Net income applicable to common shares for basic and diluted earnings per share
 
$
12,434
   
$
43,219
 
         
Denominator
       
Basic weighted average common shares
 
285,292
   
278,448
 
Dilutive stock options and restricted stock
 
11,636
   
17,796
 
Diluted weighted average common shares
 
296,928
   
296,244
 
Basic earnings per common share
       
Net income applicable to common shares
 
$
0.04
   
$
0.16
 
Diluted earnings per common share
       
Net income applicable to common shares
 
$
0.04
   
$
0.15