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Note 1 - Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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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 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
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Period Type: | duration