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Mortgage and Other Indebtedness, Net - Compliance with Key Covenant Ratios (Details)
Jan. 01, 2020
Jun. 30, 2019
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)   34.00%
Total unencumbered assets to unsecured debt (as a percent)   191.00%
Consolidated income available for debt service to annual debt service charge (as a percent)   230.00%
Maximum | Senior Unsecured Notes    
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%
Forecast | Maximum | Senior Notes Due 2023 and 2024    
Debt Instrument [Line Items]    
Secured debt to total assets (as a percent) 40.00%