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DISPOSITIONS AND HELD FOR SALE - Summary (Details) $ in Thousands	1 Months Ended														3 Months Ended					7 Months Ended	12 Months Ended
	Nov. 30, 2018 USD ($)	Oct. 31, 2018 USD ($)	Aug. 31, 2018 USD ($)	Jul. 31, 2018 USD ($)	Mar. 31, 2018 USD ($)	May 31, 2017 USD ($)	Apr. 30, 2017 USD ($) loan	Jan. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Jul. 31, 2016 USD ($)	May 31, 2016 USD ($)	Apr. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)	Sep. 30, 2016 USD ($) mall	Mar. 31, 2016 USD ($)	Sep. 30, 2017 USD ($)	Dec. 31, 2018 USD ($) mall outparcel	Dec. 31, 2017 USD ($) mall outparcel	Dec. 31, 2016 USD ($) mall outparcel	Sep. 30, 2018	Jun. 04, 2018 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gross sales price																					$ 65,000	$ 189,750	$ 194,710
Net sales price																					53,402	112,076	189,531
Gain (Loss)																					7,471	75,980	3,720
Loss on impairment																				$ 71,285	174,529	$ 71,401	$ 116,822
Real estate held-for-sale																					$ 30,971
Real estate held-for-sale portion of total assets (as a percent)																					0.60%
Number of malls with impairment (mall) | mall																					5	2	9
Non-Recourse Loans on Operating Properties
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Face value of debt instrument																					$ 43,716				$ 43,716
Mortgages
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Mortgage note payables assumed											$ 38,150
River Ridge Mall, Lynchburg, VA
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Ownership interest in joint venture (as a percent)									25.00%						25.00%		25.00%			25.00%			25.00%
Outparcel Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on sales of real estate assets																					$ 11,530	$ 17,812	$ 21,385
Number of stores sold (outparcel) | outparcel																					12	12	18
Parking Deck Project
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on sales of real estate assets																							$ 2,184
Malls | College Square Mall
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (Loss)															$ (1,448)	$ 1,994
Corporate Joint Venture | River Ridge Mall, Lynchburg, VA
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Ownership interest in joint venture (as a percent)														75.00%					75.00%
Parent Company | River Ridge Mall, Lynchburg, VA
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Ownership interest in joint venture (as a percent)														25.00%					25.00%
Gulf Coast Town Center - Phase III
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gross sales price					$ 9,000
Net sales price					8,769
Gain (Loss)					$ 2,236
Janesville Mall
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gross sales price				$ 18,000
Net sales price				17,783
Gain (Loss)				0
Loss on impairment				$ 18,061
Statesboro Crossing
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gross sales price			$ 21,500
Net sales price			10,532
Gain (Loss)			$ 3,215
Statesboro Crossing | Corporate Joint Venture
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Ownership interest in joint venture (as a percent)																								50.00%
Statesboro Crossing | Parent Company
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Ownership interest in joint venture (as a percent)																								50.00%
Parkway Plaza
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gross sales price		$ 16,500
Net sales price		16,318
Gain (Loss)		$ 1,419
College Square - Olive Garden
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gross sales price	$ 0
Net sales price	0
Gain (Loss)	$ 742
Prior Sales Adjustments
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (Loss)																					$ (141)
One and Two Oyster Point
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gross sales price								$ 6,250
Net sales price								6,142
Gain (Loss)								$ 0
The Outlet Shoppes at Oklahoma City, Oklahoma City, OK
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gross sales price							$ 130,000
Net sales price							55,368
Gain (Loss)							$ 75,434
Number of loans retired (loan) | loan							3
Priority received							$ 7,477
The Outlet Shoppes at Oklahoma City, Oklahoma City, OK | Corporate Joint Venture
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Ownership interest in joint venture (as a percent)							25.00%
The Outlet Shoppes at Oklahoma City, Oklahoma City, OK | Parent Company
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (Loss)							$ 48,800
Ownership interest in joint venture (as a percent)							75.00%
College Square & Foothills Mall
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gross sales price						$ 53,500
Net sales price						50,566
Gain (Loss)						$ 546
River Ridge Mall, Lynchburg, VA
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gross sales price														$ 33,500
Net sales price														32,905
Gain (Loss)														$ 0
Loss on impairment									$ 84										$ 9,510				9,594
Ownership interest in disposed asset (as a percent)														75.00%					75.00%
The Crossings at Marshalls Creek
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gross sales price													$ 23,650
Net sales price													21,791
Gain (Loss)													$ 3,239
Bonita Lakes Mall and Crossing
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gross sales price												$ 27,910
Net sales price												27,614
Gain (Loss)												$ 208
Loss on impairment																							5,323
The Lakes and Fashion Square
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gross sales price											66,500
Net sales price											65,514
Gain (Loss)											$ 273
Loss on impairment																							32,096
Oak Branch Business Center, Greensboro, NC
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gross sales price										$ 2,400
Net sales price										2,148
Gain (Loss)										$ 0
Loss on impairment																	$ 22	$ 122
Cobblestone Village at Palm Coast
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gross sales price									8,500
Net sales price									8,106
Gain (Loss)									0
Loss on impairment									150									6,298
Randolph Mall, Regency Mall, and Walnut Square
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gross sales price									32,250
Net sales price									31,453
Gain (Loss)									$ 0
Loss on impairment																	$ 150	$ 43,294
Number of malls with impairment (mall) | mall																		3
The Outlet Shoppes at Atlanta - Parcel Development | Parcel Project
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on sales of real estate assets																							1,621
Eastgate Crossing
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net proceeds from related to the lease of a tenant space																							$ 657

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