SEGMENT DISCLOSURE - Reconciliation Of Segment Operating Income (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Segment disclosure
Interest and other income	$ 3,892,000	$ 3,461,000
Asset management and other fees to related parties	(5,886,000)	(6,211,000)
Interest expense	(4,045,000)	(6,633,000)
General and administrative	(1,788,000)	(3,376,000)
Transaction costs	(44,000)	0
Depreciation and amortization	(9,630,000)	(13,148,000)
Loss on early extinguishment of debt	(25,071,000)	0
Impairment of real estate	(66,200,000)	0
Gain on sale of real estate	377,581,000	0
Income before provision for income taxes	291,941,000	1,010,000
Provision for income taxes	(318,000)	(388,000)
NET INCOME	291,623,000	622,000
Net loss (income) attributable to noncontrolling interests	174,000	(4,000)
NET INCOME ATTRIBUTABLE TO THE COMPANY	291,797,000	618,000
Reportable segments
Segment disclosure
Income before provision for income taxes	24,815,000	28,225,000
Corporate and Reconciling Items
Segment disclosure
Interest and other income	319,000	0
Asset management and other fees to related parties	(5,249,000)	(5,610,000)
Interest expense	(3,463,000)	(6,449,000)
General and administrative	(1,117,000)	(2,008,000)
Transaction costs	(44,000)	0
Depreciation and amortization	(9,630,000)	(13,148,000)
Impairment of real estate	(66,200,000)	0
Gain on sale of real estate	$ 377,581,000	$ 0