CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenues:
Revenue from tenants	$ 299,744	$ 291,207	$ 270,910
Operating expenses:
Asset management fees to related party	25,695	23,143	20,908
Property operating	52,715	54,068	42,594
Impairment of real estate investments	827	21,080	25,049
Acquisition and transaction related	6,257	7,557	10,151
Listing fees	0	4,988	0
Vesting and conversion of Class B Units	0	15,786	0
Equity-based compensation	12,717	5,266	128
General and administrative	20,375	22,733	19,691
Depreciation and amortization	124,713	139,907	154,027
Goodwill impairment	1,605	0	0
Total operating expenses	244,904	294,528	272,548
Operating income (loss) before gain on sale of real estate investments	54,840	(3,321)	(1,638)
Gain on sale of real estate investments	23,690	31,776	15,128
Operating income (loss)	78,530	28,455	13,490
Other (expense) income:
Interest expense	(77,994)	(66,789)	(60,305)
Other income	3,627	863	238
Total other expense, net	(74,367)	(65,926)	(60,067)
Net income (loss)	4,163	(37,471)	(46,577)
Net (income) loss attributable to non-controlling interests	(16)	62	83
Preferred stock dividends	(7,248)	0	0
Net loss attributable to common stockholders	(3,101)
Net loss attributable to common stockholders		(37,409)	(46,494)
Other comprehensive (loss) income:
Change in unrealized (loss) gain on derivative	531
Change in unrealized (loss) gain on derivative		(626)	95
Comprehensive loss attributable to common stockholders	$ (2,570)	$ (38,035)	$ (46,399)
Basic and diluted weighted-average shares outstanding (in shares)	106,397,296	105,560,053	99,649,471
Basic and diluted net loss per share attributable to stockholders (in dollars per share)	$ (0.03)	$ (0.35)	$ (0.47)