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Note 1 - Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2012
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
For the year ended December 31,
 
   
2012
   
2011
   
2010
 
Computation of Basic Earnings Per Share:
                 
Income from continuing operations
  $ 211,978     $ 158,977     $ 120,122  
Total net gain on transfer or sale of operating properties, net
    4,299       108       2,377  
Net income attributable to noncontrolling interests
    (14,202 )     (13,039 )     (18,783 )
Discontinued operations attributable to noncontrolling interests
    1,731       1,384       5,288  
Preferred stock redemption costs
    (21,703 )     -       -  
Preferred stock dividends
    (71,697 )     (59,363 )     (51,346 )
Income from continuing operations available to the common shareholders
    110,406       88,067       57,658  
Earnings attributable to unvested restricted shares
    (1,221 )     (608 )     (375 )
Income from continuing operations attributable to common shareholders
    109,185       87,459       57,283  
Income from discontinued operations attributable to the Company
    62,267       21,621       33,864  
Net income attributable to the Company’s common shareholders for basic earnings per share
  $ 171,452     $ 109,080     $ 91,147  
                         
Weighted average common shares outstanding
    405,997       406,530       405,827  
                         
Basic Earnings Per Share Attributable to the Company’s Common Shareholders:
                       
Income from continuing operations
  $ 0.27     $ 0.22     $ 0.14  
Income from discontinued operations
    0.15       0.05       0.08  
Net income
  $ 0.42     $ 0.27     $ 0.22  
Computation of Diluted Earnings Per Share:
                 
Income from continuing operations attributable to common shareholders
  $ 109,185     $ 87,459     $ 57,283  
Income from discontinued operations attributable to the Company
    62,267       21,621       33,864  
Net income attributable to common shareholders for diluted earnings per share
  $ 171,452     $ 109,080     $ 91,147  
                         
Weighted average common shares outstanding – basic
    405,997       406,530       405,827  
Effect of dilutive securities(a):                        
Equity awards
    692       1,139       374  
Shares for diluted earnings per common share
    406,689       407,669       406,201  
                         
Diluted Earnings Per Share Attributable to the Company’s Common Shareholders:
                       
Income from continuing operations
  $ 0.27     $ 0.21     $ 0.14  
Income from discontinued operations
    0.15       0.06       0.08  
Net income
  $ 0.42     $ 0.27     $ 0.22