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Mortgage and Other Indebtedness, Net - Compliance with Key Covenant Ratios of Notes (Details) | Jun. 30, 2018
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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%
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) | 45.00%
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) | 22.90%
Total unencumbered assets to unsecured debt (as a percent) | 214.00%
Consolidated income available for debt service to annual debt service charge (as a percent) | 290.00%

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