ACQUISITIONS AND DISPOSITIONS (Acquisitions) (Details) $ in Thousands											3 Months Ended								12 Months Ended
	Mar. 01, 2017 USD ($)	Jan. 18, 2017 USD ($) a	Jan. 06, 2017 USD ($) a	Dec. 29, 2016 USD ($) ft²	Dec. 20, 2016 USD ($) ft²	Dec. 19, 2016 USD ($) a	Jul. 20, 2016 USD ($) item	Jun. 01, 2016 ft²	Mar. 16, 2016 ft²	Sep. 04, 2015 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Sep. 30, 2016 USD ($) ft²	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Jun. 12, 2017 USD ($)	Dec. 19, 2016 ft²
Acquisitions
Area of land sold | ft²									42,694
Corporate gains on sale of properties																			$ 125
Payment to acquire JV partner's interest																			23,299	$ 25,480
Fixed loan																						$ 200,000
Assets acquired and consolidated into financial statements											$ 43,561								43,561
Revenues since the acquisition date											300,983	$ 258,736	$ 308,639	$ 231,762	$ 278,546	$ 242,265	$ 273,514	$ 240,680	1,100,120	1,035,005	$ 797,088
Pre-tax net loss since the acquisition date																			120,822	320,776	150,720
Equity in earnings from Real Estate and Other Affiliates																			25,498	56,818	$ 3,721
Revenues																			58,600
Air rights with total residential and commercial development rights (in square feet) | ft²									817,784
Buildings acquired consolidated											38,213								38,213
Land acquired consolidated											$ 3,069								$ 3,069
Landmark Mall
Acquisitions
Area of real estate property | a			11.4
Purchase price of acquisition			$ 22,200
American City Building
Acquisitions
Area of real estate property | ft²					117,098
Purchase price of acquisition					$ 13,500
One Mall North
Acquisitions
Area of real estate property						5.37																	97,500
Purchase price of acquisition						$ 22,200
Millennium Six Pines Apartments
Acquisitions
Voting interest acquired (as a percent)							18.57%				100.00%								100.00%
Payment to acquire JV partner's interest							$ 4,000
Construction loan							37,700
Fixed loan							$ 42,500
Interest rate (as a percent)							3.39%
Assets acquired and consolidated into financial statements							$ 67,900
Liabilities assumed and consolidated into financial statements							42,700
Revenues since the acquisition date																				2,700
Pre-tax net loss since the acquisition date																				(400)
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain							$ 27,100
Number of units | item							314
Circle T Ranch and Power Center
Acquisitions
Area of land sold | ft²								72
Equity in earnings from Real Estate and Other Affiliates																				$ 10,500
Las Vegas 51s
Acquisitions
Payment to acquire JV partner's interest	$ 16,400
Assets acquired and consolidated into financial statements	36,000
Liabilities assumed and consolidated into financial statements	3,200
Revenues since the acquisition date																			$ 6,800
Pre-tax net loss since the acquisition date																			(600)
Equity in earnings from Real Estate and Other Affiliates																			200
Revenues																			$ 1,300
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain	$ 5,400
The Club at Carlton Woods | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Acquisitions
Proceeds from dispositions										$ 25,100
Liabilities assumed by purchaser										4,000
Gain on sale of The Club at Carlton Woods										29,100
Total assets										20,900
Total liabilities										$ 24,900
The Outlet Collection, Elk Grove
Acquisitions
Area of land | a		100
Number of acres under development | a		64
The Outlet Collection, Elk Grove | Disposal by Sale
Acquisitions
Area of land sold | a		36
Proceeds from Sale of Real Estate		$ 36,000
Corporate gains on sale of properties		$ 32,200
Park West | Disposal by Sale
Acquisitions
Proceeds from Sale of Real Estate				$ 32,500
Corporate gains on sale of properties				$ (1,100)
Area of real estate property | ft²				249,177												249,177