SEGMENT DISCLOSURE - Reconciliation Of Segment Operating Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Segment disclosure
Total segment net operating income	$ 25,332	$ 27,899	$ 82,909	$ 102,483
Asset management and other fees to related parties	(6,121)	(6,896)	(18,475)	(23,459)
Interest expense	(6,965)	(9,359)	(20,409)	(28,645)
General and administrative	(1,205)	(1,342)	(6,496)	(4,668)
Transaction costs	(15)	(242)	(359)	(11,870)
Depreciation and amortization	(13,310)	(13,472)	(39,783)	(45,464)
Impairment of real estate	0	0	0	(13,100)
Gain on sale of real estate	0	74,715	0	378,732
(LOSS) INCOME BEFORE PROVISION FOR INCOME TAXES	(414)	72,730	2,837	358,891
Provision for income taxes	(115)	(339)	(795)	(1,193)
NET (LOSS) INCOME	(529)	72,391	2,042	357,698
Net loss (income) attributable to noncontrolling interests	1	4	(15)	(10)
NET (LOSS) INCOME ATTRIBUTABLE TO THE COMPANY	(528)	72,395	2,027	357,688
Reportable segments
Segment disclosure
Total segment net operating income	25,332	27,899	82,909	102,483
Corporate and Reconciling Items
Segment disclosure
Asset management and other fees to related parties	(5,381)	(6,051)	(16,495)	(20,986)
Interest expense	(6,332)	(9,243)	(19,292)	(28,442)
General and administrative	(708)	(876)	(4,143)	(2,462)
Transaction costs	(15)	(242)	(359)	(11,870)
Depreciation and amortization	(13,310)	(13,472)	(39,783)	(45,464)
Impairment of real estate	0	0	0	(13,100)
Gain on sale of real estate	$ 0	$ 74,715	$ 0	$ 378,732