RECENT TRANSACTIONS (Details) $ in Thousands					1 Months Ended	3 Months Ended		9 Months Ended
	Jul. 20, 2016 USD ($)	Jun. 01, 2016 a	Mar. 16, 2016 ft²	Sep. 04, 2015 USD ($)	Jun. 30, 2016 a	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)
Recent transactions
Revenues since the acquisition date						$ 240,806	$ 203,442	$ 752,623	$ 567,695
Pre-tax net loss since the acquisition date						18,158	174,449	260,819	125,633
Area of land sold | ft²			42,694
Proceeds from dispositions								378,257	25,139
Pre-tax gain recognized on sale of property								140,549	29,073
Equity in earnings from Real Estate and Other Affiliates						$ 13,493	$ 295	$ 35,700	$ 3,164
Air rights with total residential and commercial development rights (in square feet) | ft²			817,784
Millennium Six Pines Apartments
Recent transactions
Voting interest acquired (as a percent)	18.57%					100.00%		100.00%
Payment to acquire JV partner's interest	$ 4,000
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
Gain recognized from acquisition	27,100
Revenues since the acquisition date						$ 1,100		$ 1,100
Pre-tax net loss since the acquisition date						$ 200		200
Millennium Six Pines Apartments | Joint Venture
Recent transactions
Construction loan	$ 37,700
Circle T Ranch
Recent transactions
Area of land sold | a		74			74
Equity in earnings from Real Estate and Other Affiliates								$ 10,500
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | The Club at Carlton Woods
Recent transactions
Liabilities assumed by purchaser				$ 4,000
Assets of disposal group				20,900
Liabilities of disposal group				$ 24,900