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QUARTERLY INFORMATION (UNAUDITED) - Summary (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended									7 Months Ended	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Mar. 31, 2016	Sep. 30, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Real Estate Properties [Line Items]
Total revenues		$ 216,881	$ 206,878	$ 214,598	$ 220,200	$ 235,356	$ 224,650	$ 229,233	$ 238,013			$ 858,557	$ 927,252	$ 1,028,257
Net income (loss)		(65,621)	(2,971)	(29,976)	(661)	40,538	9,299	70,627	38,518			(99,229)	158,982	195,531
Net income (loss) attributable to the Company		(54,307)	(1,367)	(23,797)	903	36,464	8,965	41,396	34,115			(78,568)	120,940
Net income (loss) attributable to common shareholders		$ (65,530)	$ (12,590)	$ (35,020)	$ (10,320)	$ 25,241	$ (2,258)	$ 30,173	$ 22,892			$ (123,460)	$ 76,048
Basic per share/unit data attributable to common shareholders/unitholders:
Net income (loss) attributable to common shareholders (USD per share)		$ (0.39)	$ (0.07)	$ (0.20)	$ (0.06)	$ 0.15	$ (0.01)	$ 0.18	$ 0.13			$ (0.72)	$ 0.44
Loss on impairment of real estate											$ 71,285	$ 174,529	$ 71,401	116,822
Gain (loss) on sales of real estate assets												$ 19,001	93,792	29,567
Gain (loss) on extinguishment of debt													$ 30,927
The Outlet Shoppes at Oklahoma City, Oklahoma City, OK
Basic per share/unit data attributable to common shareholders/unitholders:
Gain (loss) on sales of real estate assets								$ 75,434
River Ridge Mall, Lynchburg, VA
Basic per share/unit data attributable to common shareholders/unitholders:
Loss on impairment of real estate	$ 84									$ 9,510				$ 9,594
Parent Company | The Outlet Shoppes at Oklahoma City, Oklahoma City, OK
Basic per share/unit data attributable to common shareholders/unitholders:
Gain (loss) on sales of real estate assets								48,800
Parent Company | River Ridge Mall, Lynchburg, VA
Basic per share/unit data attributable to common shareholders/unitholders:
Gain (loss) on sales of real estate assets								(5,843)
Cary Towne Center
Basic per share/unit data attributable to common shareholders/unitholders:
Loss on impairment of real estate		$ 2,693		$ 51,983
Eastland Mall
Basic per share/unit data attributable to common shareholders/unitholders:
Loss on impairment of real estate		36,525
Honey Creek Mall
Basic per share/unit data attributable to common shareholders/unitholders:
Loss on impairment of real estate		$ 48,640
Chesterfield Mall
Basic per share/unit data attributable to common shareholders/unitholders:
Gain (loss) on extinguishment of debt								20,420
Acadiana Mall, Lafayette, LA
Basic per share/unit data attributable to common shareholders/unitholders:
Loss on impairment of real estate								$ 43,007
Wausau Center, Wausau, WI
Basic per share/unit data attributable to common shareholders/unitholders:
Gain (loss) on extinguishment of debt							$ 6,851
Hickory Point
Basic per share/unit data attributable to common shareholders/unitholders:
Loss on impairment of real estate							$ 24,525

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