MORTGAGE AND OTHER INDEBTEDNESS, NET - Debt of Operating Partnership (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Mortgage notes payable	$ 2,695,888,000	$ 3,147,108,000
Mortgage and other indebtedness, variable-rate debt	847,275,000	955,751,000
Total fixed-rate and variable-rate debt	3,543,163,000	4,102,859,000
Unamortized deferred financing costs	(16,148,000)	(15,963,000)
Liabilities related to assets held for sale		(43,716,000)
Mortgage and other indebtedness, net	$ 3,527,015,000	$ 4,043,180,000
Weighted average interest rate (as a percent)	5.02%	5.10%
Fixed Rate Interest
Debt Instrument [Line Items]
Weighted average interest rate (as a percent)	5.35%	5.37%
Variable Rate Interest
Debt Instrument [Line Items]
Weighted average interest rate (as a percent)	3.98%	4.21%
Non-recourse loans on operating properties
Debt Instrument [Line Items]
Mortgage notes payable	$ 1,330,561,000	$ 1,783,097,000
Non-recourse loans on operating properties \| Fixed Rate Interest
Debt Instrument [Line Items]
Weighted average interest rate (as a percent)	5.27%	5.33%
Senior unsecured notes due 2023
Debt Instrument [Line Items]
Mortgage notes payable	$ 447,894,000	$ 447,423,000
Debt instrument, unamortized discount	$ 2,106,000	$ 2,577,000
Senior unsecured notes due 2023 \| Fixed Rate Interest
Debt Instrument [Line Items]
Weighted average interest rate (as a percent)	5.25%	5.25%
Senior unsecured notes due 2024
Debt Instrument [Line Items]
Mortgage notes payable	$ 299,960,000	$ 299,953,000
Debt instrument, unamortized discount	$ 40,000	$ 47,000
Senior unsecured notes due 2024 \| Fixed Rate Interest
Debt Instrument [Line Items]
Weighted average interest rate (as a percent)	4.60%	4.60%
Senior unsecured notes due 2026
Debt Instrument [Line Items]
Mortgage notes payable	$ 617,473,000	$ 616,635,000
Debt instrument, unamortized discount	$ 7,527,000	$ 8,365,000
Senior unsecured notes due 2026 \| Fixed Rate Interest
Debt Instrument [Line Items]
Weighted average interest rate (as a percent)	5.95%	5.95%
Recourse loans on operating Properties
Debt Instrument [Line Items]
Mortgage and other indebtedness, variable-rate debt	$ 41,950,000	$ 68,607,000
Recourse loans on operating Properties \| Variable Rate Interest
Debt Instrument [Line Items]
Weighted average interest rate (as a percent)	4.34%	4.97%
Construction loan
Debt Instrument [Line Items]
Mortgage and other indebtedness, variable-rate debt	$ 29,400,000	$ 8,172,000
Construction loan \| Variable Rate Interest
Debt Instrument [Line Items]
Weighted average interest rate (as a percent)	4.60%	5.25%
Secured Line of Credit
Debt Instrument [Line Items]
Mortgage and other indebtedness, variable-rate debt	$ 310,925,000
Weighted average interest rate (as a percent)	3.94%
Unsecured lines of credit
Debt Instrument [Line Items]
Mortgage and other indebtedness, variable-rate debt		$ 183,972,000
Unsecured lines of credit \| Variable Rate Interest
Debt Instrument [Line Items]
Weighted average interest rate (as a percent)		3.90%
Secured Term Loan
Debt Instrument [Line Items]
Mortgage and other indebtedness, variable-rate debt	$ 465,000,000
Weighted average interest rate (as a percent)	3.94%
Unsecured term loans
Debt Instrument [Line Items]
Mortgage and other indebtedness, variable-rate debt		$ 695,000,000
Unsecured term loans \| Variable Rate Interest
Debt Instrument [Line Items]
Weighted average interest rate (as a percent)		4.21%
Recourse and Nonrecourse Term Loans
Debt Instrument [Line Items]
Secured Loan	$ 2,639,827,000

Long Term Debt, Net Excluding Deferred Financing Costs

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