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Basis Of Presentation And Summary Of Significant Accounting Policies (Carrying Value Of Indebtedness And Corresponding Estimate Of Fair Value) (Details) (USD $)
In Thousands, unless otherwise specified |
Jun. 30, 2013
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Dec. 31, 2012
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| Summary Of Significant Accounting Policies [Line Items] | ||||||
| Mortgage notes payable | $ 4,484,657 | $ 3,102,485 | ||||
| Mezzanine notes payable | 311,637 | 0 | ||||
| Unsecured senior notes | 5,834,973 | 4,639,528 | ||||
| Unsecured exchangeable senior notes | 734,278 | 1,170,356 | ||||
| Impact of accounting pronouncement | (12,298) | |||||
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Carrying Amount [Member]
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| Summary Of Significant Accounting Policies [Line Items] | ||||||
| Mortgage notes payable | 4,484,657 | 3,102,485 | ||||
| Mezzanine notes payable | 311,637 | 0 | ||||
| Unsecured senior notes | 5,834,973 | 4,639,528 | ||||
| Unsecured exchangeable senior notes | 734,278 | [1] | 1,170,356 | [1] | ||
| Total | 11,365,545 | 8,912,369 | ||||
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Estimated Fair Value [Member]
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| Summary Of Significant Accounting Policies [Line Items] | ||||||
| Mortgage notes payable | 4,598,927 | 3,256,940 | ||||
| Mezzanine notes payable | 311,665 | 0 | ||||
| Unsecured senior notes | 6,093,237 | 5,162,486 | ||||
| Unsecured exchangeable senior notes | 772,691 | 1,278,554 | ||||
| Total | 11,776,520 | 9,697,980 | ||||
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ASC 470-20 Adjustment [Member]
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| Summary Of Significant Accounting Policies [Line Items] | ||||||
| Impact of accounting pronouncement | $ 12,300 | $ 25,500 | ||||
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