SEGMENTS (Summary of Segment Operating Results) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($) ft² segment location	Mar. 31, 2019 USD ($)
Segments reporting
Number of reportable segments | segment	4
Total revenues	$ 175,175	$ 353,890
Depreciation and amortization	(61,637)	(36,131)
Other (loss) income, net	(3,684)	173
Equity in earnings from real estate and other affiliates	11,349	9,951
Gain on sale or disposal of real estate	38,124	(6)
Provision for impairment	(48,738)	0
Segment EBT	(159,182)	42,941
Net (loss) income	(125,082)	31,925
Net income attributable to noncontrolling interests	(52)	(104)
Net (loss) income attributable to common stockholders	(125,134)	31,821
Operating Assets
Segments reporting
Total revenues	114,257	91,953
Master Planned Communities
Segments reporting
Total revenues	$ 50,446	50,896
Seaport District
Segments reporting
Area of real estate property (in sqft) | ft²	453,000
Number of primary locations | location	3
Operating locations | location	2
Strategic Developments
Segments reporting
Total revenues	$ 760	204,011
Operating Segments
Segments reporting
Total revenues	175,157	353,890
Total operating expenses	(194,572)	(232,162)
Segment operating income	(19,415)	121,728
Depreciation and amortization	(59,816)	(34,517)
Interest (expense) income, net	(20,761)	(9,718)
Other (loss) income, net	(3,802)	637
Equity in earnings from real estate and other affiliates	11,349	9,951
Gain on sale or disposal of real estate	38,124	(6)
Segment EBT	(103,059)	88,075
Operating Segments | Operating Assets
Segments reporting
Total revenues	114,257	91,953
Total operating expenses	(52,240)	(42,912)
Segment operating income	62,017	49,041
Depreciation and amortization	(37,089)	(27,108)
Interest (expense) income, net	(26,193)	(18,991)
Other (loss) income, net	(59)	35
Equity in earnings from real estate and other affiliates	4,394	2,709
Gain on sale or disposal of real estate	38,124	0
Provision for impairment	(48,738)	0
Segment EBT	(7,544)	5,686
Operating Segments | Master Planned Communities
Segments reporting
Total revenues	50,446	50,896
Total operating expenses	(23,722)	(28,514)
Segment operating income	26,724	22,382
Depreciation and amortization	(91)	(160)
Interest (expense) income, net	8,554	7,543
Other (loss) income, net	0	(5)
Equity in earnings from real estate and other affiliates	8,934	7,837
Segment EBT	44,121	37,597
Operating Segments | Seaport District
Segments reporting
Total revenues	9,694	7,030
Total operating expenses	(14,311)	(14,433)
Segment operating income	(4,617)	(7,403)
Depreciation and amortization	(20,875)	(6,193)
Interest (expense) income, net	(5,053)	(1,532)
Other (loss) income, net	(3,368)	(86)
Equity in earnings from real estate and other affiliates	(2,043)	(632)
Gain on sale or disposal of real estate	0	(6)
Segment EBT	(35,956)	(15,852)
Operating Segments | Strategic Developments
Segments reporting
Total revenues	760	204,011
Total operating expenses	(104,299)	(146,303)
Segment operating income	(103,539)	57,708
Depreciation and amortization	(1,761)	(1,056)
Interest (expense) income, net	1,931	3,262
Other (loss) income, net	(375)	693
Equity in earnings from real estate and other affiliates	64	37
Segment EBT	(103,680)	60,644
Corporate expenses and other items
Segments reporting
Corporate income, expenses and other items	$ (22,023)	(56,150)
Tin Building | Seaport District
Segments reporting
Area of real estate property (in sqft) | ft²	53,000
Hospitality Revenue | Operating Segments | Operating Assets
Segments reporting
Total revenues	$ 17,200	22,900
Total operating expenses	$ (12,900)	$ (15,600)