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Mortgage and Other Indebtedness, Net (Summary of Compliance With Key Covenant Ratios of Notes) (Details) | Sep. 30, 2017
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Minimum | Senior Notes Due 2023 and 2024 |
Debt Instrument [Line Items] |
Secured debt to total assets | 40.00%
Minimum | Senior Notes Due 2026 |
Debt Instrument [Line Items] |
Secured debt to total assets | 40.00%
Required | Senior Unsecured Notes |
Debt Instrument [Line Items] |
Debt to total asset value | 60.00%
Secured debt to total assets | 45.00%
Unsecured indebtedness to unencumbered asset value | 150.00%
Consolidated income available for debt service to annual debt service charge | 150.00%
Actual | Senior Unsecured Notes |
Debt Instrument [Line Items] |
Debt to total asset value | 52.00%
Secured debt to total assets | 24.00%
Unsecured indebtedness to unencumbered asset value | 209.00%
Consolidated income available for debt service to annual debt service charge | 310.00%

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