| Schedule of Calculation of Numerator and Denominator in Earnings Per Share [Table Text Block] |
| | | | | | | | | | | | | | Year Ended December 31, | | 2012 | | 2011 | | 2010 | Numerator for net income per share – basic: | |
| | |
| | |
| Income (loss) from continuing operations | $ | 311,555 |
| | $ | 57,794 |
| | $ | (103,108 | ) | Allocation to Noncontrolling Interests – Operating Partnership, net | (13,178 | ) | | (1,912 | ) | | 5,419 |
| Net (income) loss attributable to Noncontrolling Interests – Partially Owned Properties | (844 | ) | | (832 | ) | | 726 |
| Preferred distributions | (10,355 | ) | | (13,865 | ) | | (14,368 | ) | Premium on redemption of Preferred Shares | (5,152 | ) | | — |
| | — |
| Income (loss) from continuing operations available to Common Shares, net of Noncontrolling Interests | 282,026 |
| | 41,185 |
| | (111,331 | ) | Discontinued operations, net of Noncontrolling Interests | 544,186 |
| | 838,535 |
| | 380,573 |
| Numerator for net income per share – basic | $ | 826,212 |
| | $ | 879,720 |
| | $ | 269,242 |
| Numerator for net income per share – diluted (1): | | | | | | Income from continuing operations | $ | 311,555 |
| | $ | 57,794 |
| | | Net (income) attributable to Noncontrolling Interests – Partially Owned Properties | (844 | ) | | (832 | ) | | | Preferred distributions | (10,355 | ) | | (13,865 | ) | | | Premium on redemption of Preferred Shares | (5,152 | ) | | — |
| | | Income from continuing operations available to Common Shares | 295,204 |
| | 43,097 |
| | | Discontinued operations, net | 569,649 |
| | 877,403 |
| | | Numerator for net income per share – diluted (1) | $ | 864,853 |
| | $ | 920,500 |
| | $ | 269,242 |
| Denominator for net income per share – basic and diluted (1): | | | | | | Denominator for net income per share – basic | 302,701 |
| | 294,856 |
| | 282,888 |
| Effect of dilutive securities: | | | | | | OP Units | 13,853 |
| | 13,206 |
| | | Long-term compensation shares/units | 3,212 |
| | 4,003 |
| | | Denominator for net income per share – diluted (1) | 319,766 |
| | 312,065 |
| | 282,888 |
| Net income per share – basic | $ | 2.73 |
| | $ | 2.98 |
| | $ | 0.95 |
| Net income per share – diluted | $ | 2.70 |
| | $ | 2.95 |
| | $ | 0.95 |
| Net income per share – basic: | |
| | |
| | |
| Income (loss) from continuing operations available to Common Shares, net of Noncontrolling Interests | $ | 0.932 |
| | $ | 0.140 |
| | $ | (0.393 | ) | Discontinued operations, net of Noncontrolling Interests | 1.797 |
| | 2.844 |
| | 1.345 |
| Net income per share – basic | $ | 2.729 |
| | $ | 2.984 |
| | $ | 0.952 |
| Net income per share – diluted (1): | |
| | |
| | |
| Income (loss) from continuing operations available to Common Shares | $ | 0.923 |
| | $ | 0.138 |
| | $ | (0.393 | ) | Discontinued operations, net | 1.782 |
| | 2.812 |
| | 1.345 |
| Net income per share – diluted | $ | 2.705 |
| | $ | 2.950 |
| | $ | 0.952 |
| Distributions declared per Common Share outstanding | $ | 1.78 |
| | $ | 1.58 |
| | $ | 1.47 |
|
| | (1) | Potential common shares issuable from the assumed conversion of OP Units and the exercise/vesting of long-term compensation shares/units are automatically anti-dilutive and therefore excluded from the diluted earnings per share calculation as the Company had a loss from continuing operations for the year ended December 31, 2010. |
|
| Schedule of Calculation of Numerator and Denominator in Earnings Per Share [Table Text Block] |
| | | | | | | | | | | | | | Year Ended December 31, | | 2012 | | 2011 | | 2010 | Numerator for net income per Unit – basic and diluted (1): | |
| | |
| | |
| Income (loss) from continuing operations | $ | 311,555 |
| | $ | 57,794 |
| | $ | (103,108 | ) | Net (income) loss attributable to Noncontrolling Interests – Partially Owned Properties | (844 | ) | | (832 | ) | | 726 |
| Allocation to Preference Units | (10,355 | ) | | (13,865 | ) | | (14,368 | ) | Allocation to premium on redemption of Preference Units | (5,152 | ) | | — |
| | — |
| Income (loss) from continuing operations available to Units | 295,204 |
| | 43,097 |
| | (116,750 | ) | Discontinued operations, net | 569,649 |
| | 877,403 |
| | 399,091 |
| Numerator for net income per Unit – basic and diluted (1) | $ | 864,853 |
| | $ | 920,500 |
| | $ | 282,341 |
| Denominator for net income per Unit – basic and diluted (1): | | | | | | Denominator for net income per Unit – basic | 316,554 |
| | 308,062 |
| | 296,527 |
| Effect of dilutive securities: | | | | | | Dilution for Units issuable upon assumed exercise/vesting of the Company's long-term compensation shares/units | 3,212 |
| | 4,003 |
| | | Denominator for net income per Unit – diluted (1) | 319,766 |
| | 312,065 |
| | 296,527 |
| Net income per Unit – basic | $ | 2.73 |
| | $ | 2.98 |
| | $ | 0.95 |
| Net income per Unit – diluted | $ | 2.70 |
| | $ | 2.95 |
| | $ | 0.95 |
| Net income per Unit – basic: | |
| | |
| | |
| Income (loss) from continuing operations available to Units | $ | 0.932 |
| | $ | 0.140 |
| | $ | (0.393 | ) | Discontinued operations, net | 1.797 |
| | 2.844 |
| | 1.345 |
| Net income per Unit – basic | $ | 2.729 |
| | $ | 2.984 |
| | $ | 0.952 |
| Net income per Unit – diluted (1): | |
| | |
| | |
| Income (loss) from continuing operations available to Units | $ | 0.923 |
| | $ | 0.138 |
| | $ | (0.393 | ) | Discontinued operations, net | 1.782 |
| | 2.812 |
| | 1.345 |
| Net income per Unit – diluted | $ | 2.705 |
| | $ | 2.950 |
| | $ | 0.952 |
| Distributions declared per Unit outstanding | $ | 1.78 |
| | $ | 1.58 |
| | $ | 1.47 |
|
| | (1) | Potential Units issuable from the assumed exercise/vesting of the Company's long-term compensation shares/units are automatically anti-dilutive and therefore excluded from the diluted earnings per Unit calculation as the Operating Partnership had a loss from continuing operations for the year ended December 31, 2010. |
|