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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 |
Mar. 31, 2012
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Dec. 31, 2011
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| Summary Of Significant Accounting Policies [Line Items] | ||||||
| Mortgage notes payable, net | $ 2,946,760 | $ 3,123,267 | ||||
| Unsecured senior notes | 3,865,369 | 3,865,186 | ||||
| Unsecured exchangeable senior notes | 1,148,497 | 1,715,685 | ||||
| Net of the adjustment for the equity component allocation | 46,283 | |||||
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Carrying Amount [Member]
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| Summary Of Significant Accounting Policies [Line Items] | ||||||
| Mortgage notes payable, net | 2,946,760 | 3,123,267 | ||||
| Unsecured senior notes | 3,865,369 | 3,865,186 | ||||
| Unsecured exchangeable senior notes | 1,148,497 | [1] | 1,715,685 | [1] | ||
| Total | 7,960,626 | 8,704,138 | ||||
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Estimated Fair Value [Member]
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| Summary Of Significant Accounting Policies [Line Items] | ||||||
| Mortgage notes payable, net | 3,060,477 | 3,297,903 | ||||
| Unsecured senior notes | 4,185,434 | 4,148,461 | ||||
| Unsecured exchangeable senior notes | 1,328,799 | 1,904,115 | ||||
| Total | 8,574,710 | 9,350,479 | ||||
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ASC 470-20 Adjustment [Member]
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| Summary Of Significant Accounting Policies [Line Items] | ||||||
| Net of the adjustment for the equity component allocation | $ 46,300 | $ 54,500 | ||||
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