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MORTGAGE AND OTHER INDEBTEDNESS, NET (Covenants and Restrictions) (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017
Non Recourse Loans On Operating Properties |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, debt default threshold, minimum loan amount (greater than) | $ 50,000,000 |  |
Recourse loans on operating Properties |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, debt default threshold, minimum loan amount (greater than) | $ 150,000,000 |  |
Senior Unsecured Notes | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Secured debt to total assets (less than) | 40.00% |  |
Senior unsecured notes due 2026 | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Secured debt to total assets (less than) | 40.00% |  |
Other |  |  |
Debt Instrument [Line Items] |  |  |
Total unsecured debt rate |  | 60.00% | 62.50%
Unsecured Term Loan 2 |  |  |
Debt Instrument [Line Items] |  |  |
Remaining borrowing capacity | $ 429,678,000 |  |
Current borrowing capacity | $ 576,535,000 |  |
Required | Unsecured Credit Facility and Term Loan |  |  |
Debt Instrument [Line Items] |  |  |
Total debt to total assets | 60.00% |  |
Total unencumbered assets to unsecured debt | 60.00% |  |
Unencumbered NOI to unsecured interest expense | 175.00% |  |
EBITDA to fixed charges (debt service) | 150.00% |  |
Required | Senior Unsecured Notes |  |  |
Debt Instrument [Line Items] |  |  |
Total debt to total assets | 60.00% |  |
Total unencumbered assets to unsecured debt | 150.00% |  |
Secured debt to total assets (less than) | 45.00% |  |
Consolidated income available for debt service to annual debt service charge (percent) | 150.00% |  |
Actual | Unsecured Credit Facility and Term Loan |  |  |
Debt Instrument [Line Items] |  |  |
Total debt to total assets | 50.00% |  |
Total unencumbered assets to unsecured debt | 48.00% |  |
Unencumbered NOI to unsecured interest expense | 330.00% |  |
EBITDA to fixed charges (debt service) | 240.00% |  |
Actual | Senior Unsecured Notes |  |  |
Debt Instrument [Line Items] |  |  |
Total debt to total assets | 52.00% |  |
Total unencumbered assets to unsecured debt | 208.00% |  |
Secured debt to total assets (less than) | 23.00% |  |
Consolidated income available for debt service to annual debt service charge (percent) | 310.00% |  |

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