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Note 5. Earnings Per Common Share (Tables)
6 Months Ended
Jun. 30, 2011
Schedule of Calculation of Numerator and Denominator in Earnings Per Share [Table Text Block]
   
Three Months Ended
June 30,
   
Six Months Ended
June 30,
 
   
2011
   
2010
   
2011
   
2010
 
Numerator
                   
 
 
Net income
  $ 33,317     $ 17,084     $ 76,674     $ 38,928  
Preferred stock dividends
    (138 )     (3,409 )     (276 )     (6,817 )
Net income applicable to common shares for basic and diluted earnings per share
  $ 33,179     $ 13,675     $ 76,398     $ 32,111  
                                 
Denominator
                               
Basic weighted average common shares
    279,347       248,549       278,901       245,371  
Dilutive stock options and restricted stock
    16,409       17,825       17,119       18,497  
Diluted weighted average common shares
    295,756       266,374       296,020       263,868  
                                 
Basic earnings per common share
                               
Net income applicable to common shares
  $ 0.12     $ 0.06     $ 0.27     $ 0.13  
                                 
Diluted earnings per common share
                               
Net income applicable to common shares
  $ 0.11     $ 0.05     $ 0.26     $ 0.12