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Mortgage and Other Indebtedness, Net (Summary of Compliance With Key Covenant Ratios of Notes) (Details)	Sep. 30, 2017
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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- Definition

Secured Debt to Total Assets

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- Definition

Income Available for Debt Service to Debt Service Charge

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- Definition

Ratio of Total Debt to Total Assets

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- Definition

Total Unencumbered Assets to Unsecured Debt

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- Definition

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