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MORTGAGE AND OTHER INDEBTEDNESS, NET - Fixed Rate Debt (Details) - USD ($) $ in Thousands	1 Months Ended									2 Months Ended	3 Months Ended	12 Months Ended
	Sep. 30, 2018	Aug. 31, 2018	Sep. 30, 2017	Aug. 31, 2017	Jun. 30, 2017	Apr. 30, 2017	Mar. 31, 2017	Feb. 28, 2017	Jan. 31, 2017	Sep. 30, 2018	Jun. 30, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jun. 04, 2018
Debt Instrument [Line Items]
Amount Financed or Extended										$ 102,446		$ 0	$ 1,802	$ 0
Principal Balance Repaid												$ 17,278	427,247
Gain (loss) on extinguishment of debt													30,927
Fixed Rate Operating Loans
Debt Instrument [Line Items]
Weighted-average remaining term to maturity												3 years
Non-Recourse Loans on Operating Properties
Debt Instrument [Line Items]
Face value of debt instrument												$ 43,716			$ 43,716
Hickory Point Mall
Debt Instrument [Line Items]
Stated interest rate (as a percent)		5.85%
Amount Financed or Extended		$ 27,446
The Outlet Shoppes At El Paso
Debt Instrument [Line Items]
Stated interest rate (as a percent)	5.10%									5.10%
Amount Financed or Extended	$ 75,000
Interest rate (as a percent)			7.06%
Principal Balance Repaid			$ 61,561
Kirkwood Mall
Debt Instrument [Line Items]
Interest rate (as a percent)									5.75%
Principal Balance Repaid									$ 37,295
The Plaza at Fayette, Lexington, KY
Debt Instrument [Line Items]
Interest rate (as a percent)									5.67%
Principal Balance Repaid									$ 37,146
The Shoppes at St. Clair Square, Fairview Heights, IL
Debt Instrument [Line Items]
Interest rate (as a percent)									5.67%
Principal Balance Repaid									$ 18,827
Hamilton Corner, Chattanooga, TN
Debt Instrument [Line Items]
Interest rate (as a percent)								5.67%
Principal Balance Repaid								$ 14,227
Layton Hills Mall, Layton, UT
Debt Instrument [Line Items]
Interest rate (as a percent)							5.66%
Principal Balance Repaid							$ 89,526
The Outlet Shoppes at Oklahoma City, Oklahoma City, OK
Debt Instrument [Line Items]
Interest rate (as a percent)						5.73%
Principal Balance Repaid						$ 53,386
Gain (loss) on extinguishment of debt						$ (8,500)
Outlet Shoppes at Oklahoma City - Phase II
Debt Instrument [Line Items]
Interest rate (as a percent)						3.53%
Principal Balance Repaid						$ 5,545
Outlet Shoppes at Oklahoma City - Phase III
Debt Instrument [Line Items]
Interest rate (as a percent)						3.53%
Principal Balance Repaid						$ 2,704
Hanes Mall, Winston-Salem, NC
Debt Instrument [Line Items]
Interest rate (as a percent)			6.99%
Principal Balance Repaid			$ 144,325
Gain (loss) on extinguishment of debt			$ (371)
Midland Mall | Mortgages
Debt Instrument [Line Items]
Interest rate (as a percent)									6.10%
Gain (loss) on extinguishment of debt									$ 3,760
Balance of Non-recourse Debt									$ 31,953
Chesterfield Mall
Debt Instrument [Line Items]
Gain (loss) on extinguishment of debt											$ 20,420
Chesterfield Mall | Mortgages
Debt Instrument [Line Items]
Interest rate (as a percent)					5.74%						5.74%
Gain (loss) on extinguishment of debt					$ 29,187
Balance of Non-recourse Debt					$ 140,000						$ 140,000
Wausau Center | Mortgages
Debt Instrument [Line Items]
Interest rate (as a percent)				5.85%
Gain (loss) on extinguishment of debt				$ 6,851
Balance of Non-recourse Debt				$ 17,689
Chesterfield Mall, Midland Mall, and Wausau Center
Debt Instrument [Line Items]
Gain (loss) on extinguishment of debt													39,798
Balance of Non-recourse Debt													189,642
Outlet Shoppes at Atlanta - Ridgewalk | Mortgages
Debt Instrument [Line Items]
Balance of Non-recourse Debt													$ 2,466
Minimum | Fixed Rate Operating Loans
Debt Instrument [Line Items]
Interest rate of debt bearing fixed interest (as a percent)												4.00%
Maximum | Fixed Rate Operating Loans
Debt Instrument [Line Items]
Interest rate of debt bearing fixed interest (as a percent)												8.00%

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