Reportable Segments (Reconciliation to Consolidated) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Net income (loss)	$ (10,326)	$ (1,773)	$ (3,450)	$ (3,999)	$ (8,065)	$ (2,782)	$ (1,408)	$ 11,376	$ (19,548)	$ (879)	$ (17,186)
Depreciation and amortization									46,193	32,478	29,687
Acquisition related expenses									161	144	3,212
Asset management and acquisition fees									7,985	5,004	11,681
Performance participation allocation									7,713	5,954	251
General and administrative expenses									3,652	3,131	2,803
Gain (loss) on investments in real estate-related securities									2,317	(401)	0
Gain on sale of real estate									0	(14,491)	0
Foreign currency (gains) losses									617	438	(494)
Interest expense									18,608	12,649	9,453
Interest and other income									(1,480)	(261)	(83)
(Benefit) provision for income taxes									(980)	9	(83)
Total property revenues in excess of expenses									62,896	44,849	39,613
Segment Reconciling Items
Segment Reporting Information [Line Items]
Net income (loss)									(19,548)	(879)	(17,186)
Depreciation and amortization									46,193	32,478	29,687
Acquisition related expenses									161	144	3,212
Asset management and acquisition fees									7,985	5,004	11,681
Performance participation allocation									7,713	5,954	251
General and administrative expenses									3,652	3,131	2,803
(Gain) loss on derivative instruments									2,292	272	372
Gain (loss) on investments in real estate-related securities									2,317	(401)	0
Gain on sale of real estate									0	(14,491)	0
Foreign currency (gains) losses									617	438	(494)
Interest expense									18,608	12,649	9,453
Interest and other income									(1,480)	(261)	(83)
(Benefit) provision for income taxes									$ (980)	$ 9	$ 83