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MORTGAGE AND OTHER INDEBTEDNESS, NET - Dispositions (Details) - USD ($) $ in Thousands	1 Months Ended		12 Months Ended
	Jan. 31, 2019	Dec. 31, 2018	Dec. 31, 2020	Dec. 31, 2019	Aug. 06, 2020
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage					5.00%
Balance of Non-recourse Debt			$ 833,444
Gain on extinguishment of debt			32,521	$ 71,722
Net Sales Price		$ 53,402
Cary Towne Center
Debt Instrument [Line Items]
Net Sales Price	$ 31,500		31,500
Mortgages
Debt Instrument [Line Items]
Balance of Non-recourse Debt			91,679	163,476
Gain on extinguishment of debt			$ 32,521	$ 71,722
Mortgages \| Hickory Point Mall
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage			5.85%
Balance of Non-recourse Debt			$ 27,446
Gain on extinguishment of debt			$ 15,446
Mortgages \| Cary Towne Center
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage			6.00%
Balance of Non-recourse Debt			$ 64,233
Gain on extinguishment of debt			$ 17,075
Mortgages \| Acadiana Mall
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage				5.67%
Balance of Non-recourse Debt				$ 119,760
Gain on extinguishment of debt				$ 61,795
Mortgages \| Cary Towne Center
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage				4.00%
Balance of Non-recourse Debt				$ 43,716
Gain on extinguishment of debt				$ 9,927