CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Income Statement [Abstract]
Revenue from tenants	$ 100,235,000	$ 88,718,000
Operating expenses:
Property operating and maintenance	61,723,000	52,799,000
Impairment charges	18,038,000	0
Operating fees to related parties	6,049,000	5,768,000
Acquisition and transaction related	327,000	18,000
General and administrative	6,730,000	6,298,000
Depreciation and amortization	20,195,000	20,685,000
Total expenses	113,062,000	85,568,000
Operating (loss) income before gain on sale of real estate investments	(12,827,000)	3,150,000
Gain on sale of real estate investments	2,306,000	6,078,000
Operating (loss) income	(10,521,000)	9,228,000
Other income (expense):
Interest expense	(13,257,000)	(13,943,000)
Interest and other income	5,000	4,000
Gain (loss) on non-designated derivatives	16,000	(43,000)
Total other expenses	(13,236,000)	(13,982,000)
Loss before income taxes	(23,757,000)	(4,754,000)
Income tax expense	(332,000)	(338,000)
Net loss	(24,089,000)	(5,092,000)
Net loss (income) attributable to non-controlling interests	87,000	(19,000)
Preferred stock dividends	(742,000)	0
Net loss attributable to stockholders	(24,744,000)	(5,111,000)
Other comprehensive (loss) income:
Unrealized loss on designated derivatives	(37,265,000)	(2,419,000)
Comprehensive loss attributable to stockholders	$ (62,009,000)	$ (7,530,000)
Basic and diluted weighted-average shares outstanding (in shares)	91,960,960	92,894,608
Basic and diluted net loss per share (in usd per share)	$ (0.27)	$ (0.06)