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Earnings Per Share (Tables) | 9 Months Ended
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Sep. 30, 2015
Schedule of Calculation of Numerator and Denominator in Earnings Per Share [Table Text Block] | The following tables set forth the computation of net income per share – basic and net income per share – diluted for the Company (amounts in thousands except per share amounts):
|  | Nine Months Ended September 30, |  | Quarter Ended September 30,
|  | 2015 |  | 2014 |  | 2015 |  | 2014
Numerator for net income per share – basic: |  |  |  |  |  |  |  |
Income from continuing operations |  | $ | 693,948 |  |  | $ | 430,142 |  |  | $ | 205,375 |  |  | $ | 231,252 |
Allocation to Noncontrolling Interests – Operating Partnership, net |  | (26,178 | ) |  | (16,216 | ) |  | (7,775 | ) |  | (8,740 | )
Net (income) attributable to Noncontrolling Interests – Partially Owned Properties |  | (2,473 | ) |  | (1,800 | ) |  | (986 | ) |  | (708 | )
Preferred distributions |  | (2,557 | ) |  | (3,109 | ) |  | (833 | ) |  | (1,037 | )
Premium on redemption of Preferred Shares |  | (2,789 | ) |  | — |  |  | — |  |  | — |
Income from continuing operations available to Common Shares, net of Noncontrolling Interests |  | 659,951 |  |  | 409,017 |  |  | 195,781 |  |  | 220,767 |
Discontinued operations, net of Noncontrolling Interests |  | 337 |  |  | 1,443 |  |  | 78 |  |  | (60 | )
Numerator for net income per share – basic |  | $ | 660,288 |  |  | $ | 410,460 |  |  | $ | 195,859 |  |  | $ | 220,707 |
Numerator for net income per share – diluted: |  |  |  |  |  |  |  |
Income from continuing operations |  | $ | 693,948 |  |  | $ | 430,142 |  |  | $ | 205,375 |  |  | $ | 231,252 |
Net (income) attributable to Noncontrolling Interests – Partially Owned Properties |  | (2,473 | ) |  | (1,800 | ) |  | (986 | ) |  | (708 | )
Preferred distributions |  | (2,557 | ) |  | (3,109 | ) |  | (833 | ) |  | (1,037 | )
Premium on redemption of Preferred Shares |  | (2,789 | ) |  | — |  |  | — |  |  | — |
Income from continuing operations available to Common Shares |  | 686,129 |  |  | 425,233 |  |  | 203,556 |  |  | 229,507 |
Discontinued operations, net |  | 350 |  |  | 1,500 |  |  | 81 |  |  | (62 | )
Numerator for net income per share – diluted |  | $ | 686,479 |  |  | $ | 426,733 |  |  | $ | 203,637 |  |  | $ | 229,445 |
Denominator for net income per share – basic and diluted: |  |  |  |  |  |  |  |
Denominator for net income per share – basic |  | 363,386 |  |  | 360,900 |  |  | 363,579 |  |  | 361,409 |
Effect of dilutive securities: |  |  |  |  |  |  |  |
OP Units |  | 13,584 |  |  | 13,726 |  |  | 13,568 |  |  | 13,707 |
Long-term compensation shares/units |  | 3,453 |  |  | 2,602 |  |  | 3,516 |  |  | 2,838 |
Denominator for net income per share – diluted |  | 380,423 |  |  | 377,228 |  |  | 380,663 |  |  | 377,954 |
Net income per share – basic |  | $ | 1.82 |  |  | $ | 1.14 |  |  | $ | 0.54 |  |  | $ | 0.61 |
Net income per share – diluted |  | $ | 1.80 |  |  | $ | 1.13 |  |  | $ | 0.53 |  |  | $ | 0.61 |
Net income per share – basic: |  |  |  |  |  |  |  |
Income from continuing operations available to Common Shares, net of Noncontrolling Interests |  | $ | 1.82 |  |  | $ | 1.13 |  |  | $ | 0.54 |  |  | $ | 0.61 |
Discontinued operations, net of Noncontrolling Interests |  | — |  |  | 0.01 |  |  | — |  |  | — |
Net income per share – basic |  | $ | 1.82 |  |  | $ | 1.14 |  |  | $ | 0.54 |  |  | $ | 0.61 |
Net income per share – diluted: |  |  |  |  |  |  |  |
Income from continuing operations available to Common Shares |  | $ | 1.80 |  |  | $ | 1.13 |  |  | $ | 0.53 |  |  | $ | 0.61 |
Discontinued operations, net |  | — |  |  | — |  |  | — |  |  | — |
Net income per share – diluted |  | $ | 1.80 |  |  | $ | 1.13 |  |  | $ | 0.53 |  |  | $ | 0.61 |
ERPOP [Member] |
Schedule of Calculation of Numerator and Denominator in Earnings Per Share [Table Text Block] | The following tables set forth the computation of net income per Unit – basic and net income per Unit – diluted for the Operating Partnership (amounts in thousands except per Unit amounts):
|  | Nine Months Ended September 30, |  | Quarter Ended September 30,
|  | 2015 |  | 2014 |  | 2015 |  | 2014
Numerator for net income per Unit – basic and diluted: |  |  |  |  |  |  |  |
Income from continuing operations |  | $ | 693,948 |  |  | $ | 430,142 |  |  | $ | 205,375 |  |  | $ | 231,252 |
Net (income) attributable to Noncontrolling Interests – Partially Owned Properties |  | (2,473 | ) |  | (1,800 | ) |  | (986 | ) |  | (708 | )
Allocation to Preference Units |  | (2,557 | ) |  | (3,109 | ) |  | (833 | ) |  | (1,037 | )
Allocation to premium on redemption of Preference Units |  | (2,789 | ) |  | — |  |  | — |  |  | — |
Income from continuing operations available to Units |  | 686,129 |  |  | 425,233 |  |  | 203,556 |  |  | 229,507 |
Discontinued operations, net |  | 350 |  |  | 1,500 |  |  | 81 |  |  | (62 | )
Numerator for net income per Unit – basic and diluted |  | $ | 686,479 |  |  | $ | 426,733 |  |  | $ | 203,637 |  |  | $ | 229,445 |
Denominator for net income per Unit – basic and diluted: |  |  |  |  |  |  |  |
Denominator for net income per Unit – basic |  | 376,970 |  |  | 374,626 |  |  | 377,147 |  |  | 375,116 |
Effect of dilutive securities: |  |  |  |  |  |  |  |
Dilution for Units issuable upon assumed exercise/vesting of the Company’s long-term compensation shares/units |  | 3,453 |  |  | 2,602 |  |  | 3,516 |  |  | 2,838 |
Denominator for net income per Unit – diluted |  | 380,423 |  |  | 377,228 |  |  | 380,663 |  |  | 377,954 |
Net income per Unit – basic |  | $ | 1.82 |  |  | $ | 1.14 |  |  | $ | 0.54 |  |  | $ | 0.61 |
Net income per Unit – diluted |  | $ | 1.80 |  |  | $ | 1.13 |  |  | $ | 0.53 |  |  | $ | 0.61 |
Net income per Unit – basic: |  |  |  |  |  |  |  |
Income from continuing operations available to Units |  | $ | 1.82 |  |  | $ | 1.13 |  |  | $ | 0.54 |  |  | $ | 0.61 |
Discontinued operations, net |  | — |  |  | 0.01 |  |  | — |  |  | — |
Net income per Unit – basic |  | $ | 1.82 |  |  | $ | 1.14 |  |  | $ | 0.54 |  |  | $ | 0.61 |
Net income per Unit – diluted: |  |  |  |  |  |  |  |
Income from continuing operations available to Units |  | $ | 1.80 |  |  | $ | 1.13 |  |  | $ | 0.53 |  |  | $ | 0.61 |
Discontinued operations, net |  | — |  |  | — |  |  | — |  |  | — |
Net income per Unit – diluted |  | $ | 1.80 |  |  | $ | 1.13 |  |  | $ | 0.53 |  |  | $ | 0.61 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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