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Mortgage and Other Indebtedness, Net - Compliance with Key Covenant Ratios of Notes (Details)	Sep. 30, 2018
Minimum | Senior Notes Due 2023 and 2024
Debt Instrument [Line Items]
Secured debt to total assets (as a percent)	40.00%
Minimum | Senior Notes Due 2026
Debt Instrument [Line Items]
Secured debt to total assets (as a percent)	40.00%
Maximum | Senior Notes Due 2023 and 2024
Debt Instrument [Line Items]
Secured debt to total assets (as a percent)	45.00%
Required | Senior Unsecured Notes
Debt Instrument [Line Items]
Total debt to total assets (as a percent)	60.00%
Secured debt to total assets (as a percent)	40.00%
Total unencumbered assets to unsecured debt (as a percent)	150.00%
Consolidated income available for debt service to annual debt service charge (as a percent)	150.00%
Actual | Senior Unsecured Notes
Debt Instrument [Line Items]
Total debt to total assets (as a percent)	52.00%
Secured debt to total assets (as a percent)	24.00%
Total unencumbered assets to unsecured debt (as a percent)	215.00%
Consolidated income available for debt service to annual debt service charge (as a percent)	270.00%

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- Definition

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- Definition

Income Available for Debt Service to Debt Service Charge

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- Definition

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- Definition

Total Unencumbered Assets to Unsecured Debt

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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