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QUARTERLY INFORMATION - Narrative (Details) - USD ($)	3 Months Ended				12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Real Estate Properties [Line Items]
Gain on extinguishment of debt					$ 71,722,000		$ 30,927,000
Loss on impairment of real estate					239,521,000	$ 174,529,000	71,401,000
Accrued maximum expense related to settlement				$ 88,150,000
Loss on investment					67,242,000		(6,197,000)
Gain on Sale of Investments					$ 67,242,000		$ 6,197,000
Outlet Shoppes at El Paso
Real Estate Properties [Line Items]
Loss on investment		$ 11,174,000
Acadiana Mall and Cary Towne Center
Real Estate Properties [Line Items]
Gain on extinguishment of debt				71,722,000
Greenbrier Mall and Honey Creek Mall
Real Estate Properties [Line Items]
Loss on impairment of real estate				$ 24,825,000
EastGate Mall and The Forum at Grandview
Real Estate Properties [Line Items]
Loss on impairment of real estate			$ 41,608,000
Laurel Park Place and Mid Rivers Mall
Real Estate Properties [Line Items]
Loss on impairment of real estate		$ 135,688,000
Park Plaza Mall
Real Estate Properties [Line Items]
Loss on impairment of real estate	$ 37,400,000
The Outlet Shoppes at Atlanta
Real Estate Properties [Line Items]
Gain on Sale of Investments	$ 56,067,000

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