SEGMENT DISCLOSURE - Reconciliation Of Segment Operating Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Segment disclosure
Total segment net operating income	$ 29,352	$ 32,469	$ 57,577	$ 74,584
Asset management and other fees to related parties	(6,143)	(7,863)	(12,354)	(16,563)
Interest expense	(6,811)	(9,513)	(13,444)	(19,286)
General and administrative	(1,915)	(1,647)	(5,291)	(3,326)
Transaction costs	(344)	(11,615)	(344)	(11,628)
Depreciation and amortization	(13,325)	(14,761)	(26,473)	(31,992)
Impairment of real estate	0	(13,100)	0	(13,100)
Gain on sale of real estate	0	116,283	0	304,017
Income before provision for income taxes	2,241	91,834	3,251	286,161
Provision for income taxes	(292)	(462)	(680)	(854)
NET INCOME	1,949	91,372	2,571	285,307
Net income attributable to noncontrolling interests	(12)	(9)	(16)	(14)
NET INCOME ATTRIBUTABLE TO THE COMPANY	1,937	91,363	2,555	285,293
Reportable segments
Segment disclosure
Total segment net operating income	29,352	32,469	57,577	74,584
Corporate and Reconciling Items
Segment disclosure
Asset management and other fees to related parties	(5,504)	(7,079)	(11,114)	(14,935)
Interest expense	(6,511)	(9,568)	(12,960)	(19,199)
General and administrative	(1,427)	(795)	(3,435)	(1,586)
Transaction costs	(344)	(11,615)	(344)	(11,628)
Depreciation and amortization	(13,325)	(14,761)	(26,473)	(31,992)
Impairment of real estate	0	(13,100)	0	(13,100)
Gain on sale of real estate	$ 0	$ 116,283	$ 0	$ 304,017