CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Statement [Abstract]
Revenue from tenants	$ 82,711	$ 77,942	$ 243,062	$ 229,529
Expenses (income):
Property operating	7,525	8,205	22,737	22,613
Operating fees to related parties	8,939	8,220	26,607	24,425
Impairment charges	0	6,375	0	6,375
Acquisition, transaction and other costs (Note 9)	75	192	388	1,301
General and administrative	2,641	3,250	9,014	8,774
Equity-based compensation	2,479	2,501	7,480	7,039
Depreciation and amortization	35,049	31,620	102,566	94,007
Total expenses	56,708	60,363	168,792	164,534
Operating income before gain (loss) on dispositions of real estate investments	26,003	17,579	74,270	64,995
Gain (loss) on dispositions of real estate investments	0	6,977	(153)	14,792
Operating income	26,003	24,556	74,117	79,787
Other income (expense):
Interest expense	(18,677)	(16,154)	(52,646)	(47,005)
Loss on extinguishment of debt	0	(563)	(309)	(1,328)
(Loss) gain on derivative instruments	(2,464)	3,044	362	4,674
Unrealized income on undesignated foreign currency advances and other hedge ineffectiveness	0	0	0	76
Other income (loss)	142	(2)	261	21
Total other expense, net	(20,999)	(13,675)	(52,332)	(43,562)
Net income before income tax	5,004	10,881	21,785	36,225
Income tax expense	(862)	(940)	(2,512)	(2,680)
Net income	4,142	9,941	19,273	33,545
Preferred stock dividends	(4,644)	(3,081)	(13,771)	(8,273)
Net (loss) income attributable to common stockholders	$ (502)	$ 6,860	$ 5,502	$ 25,272
Weighted average shares outstanding - Basic (in shares)	89,482,577	85,254,638	89,470,525	83,539,304
Weighted average shares outstanding - Diluted (in shares)	89,482,577	86,202,582	89,470,525	84,487,248
Net income (loss) per share attributable to common stockholders - Basic and Diluted (in dollars per share)	$ (0.01)	$ 0.08	$ 0.06	$ 0.30