CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Statement [Abstract]
Revenue from tenants		$ 329,355	$ 381,612	$ 374,914
Operating expenses:
Property operating and maintenance		205,813	243,548	234,185
Impairment charges		40,951	36,446	55,969
Operating fees to related parties		24,206	23,922	23,414
Acquisition and transaction related		2,714	173	362
General and administrative		16,828	21,572	20,530
Depreciation and amortization		79,926	81,053	81,032
Total expenses		370,438	406,714	415,492
Operating loss before gain on sale of real estate investments		(41,083)	(25,102)	(40,578)
Gain on sale of real estate investments		3,648	5,230	8,790
Operating loss		(37,435)	(19,872)	(31,788)
Other income (expense):
Interest expense		(47,900)	(51,519)	(56,059)
Interest and other income		61	44	7
Gain (loss) on non-designated derivatives		37	(102)	(68)
Total other expenses		(47,802)	(51,577)	(56,120)
Loss before income taxes		(85,237)	(71,449)	(87,908)
Income tax expense		(203)	(4,061)	(399)
Net loss		(85,440)	(75,510)	(88,307)
Net loss (income) attributable to non-controlling interests		260	(303)	393
Allocation for preferred stock		(7,762)	(2,968)	(173)
Net loss attributable to common stockholders		(92,942)	(78,781)	(88,087)
Other comprehensive income (loss):
Unrealized gain (loss) on designated derivatives		25,332	(32,630)	(11,625)
Comprehensive loss attributable to common stockholders		$ (67,610)	$ (111,411)	$ (99,712)
Weighted-average common shares outstanding - Basic (in shares)	[1]	100,534,438	100,312,245	100,093,694
Weighted-average common shares outstanding - Diluted (in shares)	[1]	100,534,438	100,312,245	100,093,694
Net loss per common share attributable to common stockholders - Basic (in usd per share)	[1]	$ (0.92)	$ (0.79)	$ (0.88)
Net loss per common share attributable to common stockholders - Diluted (in usd per share)	[1]	$ (0.92)	$ (0.79)	$ (0.88)

[1] Retroactively adjusted for the effects of the Stock Dividends (see Note 1).