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MORTGAGE AND OTHER INDEBTEDNESS, NET (Debt of Operating Partnership) (Details) |  | 1 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 01, 2017 USD ($) | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($) loan | Jul. 31, 2017 loan | Dec. 31, 2016 USD ($)
Debt Instrument [Line Items] |  |  |  |  |
Loan, outstanding amount |  |  | $ 3,158,973,000 |  | $ 3,594,379,000
Mortgage and other indebtedness, variable-rate debt |  |  | 1,090,810,000 |  | 888,770,000
Total fixed-rate and variable-rate debt |  |  | 4,249,783,000 |  | 4,483,149,000
Deferred financing costs |  |  | (18,938,000) |  | (17,855,000)
Mortgage and other indebtedness |  |  | $ 4,230,845,000 |  | $ 4,465,294,000
Weighted average interest rate |  |  | 4.74% |  | 4.82%
Fixed Rate Interest |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Weighted average interest rate |  |  | 5.37% |  | 5.48%
Variable Rate Interest |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Weighted average interest rate |  |  | 2.90% |  | 2.15%
Non Recourse Loans On Operating Properties |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Loan, outstanding amount |  |  | $ 1,796,203,000 |  | $ 2,453,628,000
Mortgage and other indebtedness, variable-rate debt |  |  | $ 10,836,000 |  | $ 19,055,000
Non Recourse Loans On Operating Properties | Fixed Rate Interest |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Weighted average interest rate |  |  | 5.33% |  | 5.55%
Non Recourse Loans On Operating Properties | Variable Rate Interest |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Weighted average interest rate |  |  | 3.37% |  | 3.13%
Senior unsecured notes due 2023 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Loan, outstanding amount |  |  | $ 446,976,000 |  | $ 446,552,000
Debt instrument, face value |  |  | $ 450,000,000 |  |
Senior unsecured notes due 2023 | Fixed Rate Interest |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Weighted average interest rate |  |  | 5.25% |  | 5.25%
Senior unsecured notes due 2024 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Loan, outstanding amount |  |  | $ 299,946,000 |  | $ 299,939,000
Debt instrument, unamortized discount |  |  | 54,000 |  | $ 61,000
Debt instrument, face value |  |  | $ 300,000,000 |  |
Senior unsecured notes due 2024 | Fixed Rate Interest |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Weighted average interest rate |  |  | 4.60% |  | 4.60%
Senior unsecured notes due 2026 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Loan, outstanding amount |  |  | $ 615,848,000 |  | $ 394,260,000
Deferred financing costs |  | $ (1,879,000) |  |  |
Debt instrument, unamortized discount |  | 3,938,000 | 9,152,000 |  | $ 5,740,000
Debt instrument, face value |  |  | $ 625,000,000 |  |
Proceeds from mortgage and other indebtedness | $ 225,000,000 | $ 225,000,000 |  |  |
Senior unsecured notes due 2026 | Fixed Rate Interest |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Weighted average interest rate |  |  | 5.95% |  | 5.95%
Recourse loans on operating Properties |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Mortgage and other indebtedness, variable-rate debt |  |  | $ 101,187,000 |  | $ 24,428,000
Recourse loans on operating Properties | Variable Rate Interest |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Weighted average interest rate |  |  | 4.00% |  | 3.29%
Construction loan |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Mortgage and other indebtedness, variable-rate debt |  |  | $ 0 |  | $ 39,263,000
Construction loan | Variable Rate Interest |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Weighted average interest rate |  |  | 0.00% |  | 3.12%
Unsecured lines of credit |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Mortgage and other indebtedness, variable-rate debt |  |  | $ 93,787,000 |  | $ 6,024,000
Unsecured lines of credit | Variable Rate Interest |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Weighted average interest rate |  |  | 2.56% |  | 1.82%
Unsecured term loans |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Number of debt instruments (loan) | loan |  |  | 3 | 3 |
Mortgage and other indebtedness, variable-rate debt |  |  | $ 885,000,000 |  | $ 800,000,000
Unsecured term loans | Variable Rate Interest |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Weighted average interest rate |  |  | 2.81% |  | 2.04%
Senior Unsecured Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, unamortized discount |  |  | $ 3,024,000 |  | $ 3,448,000
Recourse and Nonrecourse Term Loans |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Secured non-recourse and recourse term loans |  |  | $ 2,073,448,000 |  |

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