|
Basis Of Presentation And Summary Of Significant Accounting Policies (Carrying Value Of Indebtedness And Corresponding Estimate Of Fair Value) (Details) (USD $)
|
Sep. 30, 2014
|
Dec. 31, 2013
|
|||
|---|---|---|---|---|---|
| Summary Of Significant Accounting Policies [Line Items] | |||||
| Mortgage notes payable | $ 4,328,464,000 | $ 4,449,734,000 | |||
| Mezzanine notes payable | 310,114,000 | 311,040,000 | |||
| Unsecured senior notes | 5,837,172,000 | 5,835,854,000 | |||
| Unsecured exchangeable senior notes | 0 | 744,880,000 | |||
|
Estimated Fair Value [Member]
|
|||||
| Summary Of Significant Accounting Policies [Line Items] | |||||
| Mortgage notes payable | 4,460,353,000 | 4,545,283,000 | |||
| Mezzanine notes payable | 310,141,000 | 311,064,000 | |||
| Unsecured senior notes | 6,173,499,000 | 6,050,517,000 | |||
| Unsecured exchangeable senior notes | 0 | 750,266,000 | |||
| Total | 10,943,993,000 | 11,657,130,000 | |||
|
Carrying Amount [Member]
|
|||||
| Summary Of Significant Accounting Policies [Line Items] | |||||
| Mortgage notes payable | 4,328,464,000 | 4,449,734,000 | |||
| Mezzanine notes payable | 310,114,000 | 311,040,000 | |||
| Unsecured senior notes | 5,837,172,000 | 5,835,854,000 | |||
| Unsecured exchangeable senior notes | 0 | 744,880,000 | [1] | ||
| Total | 10,475,750,000 | 11,341,508,000 | |||
|
ASC 470-20 Adjustment [Member]
|
|||||
| Summary Of Significant Accounting Policies [Line Items] | |||||
| Impact of accounting pronouncement | $ 2,400,000 | ||||
|
|||||