CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenues:
Rental income	$ 81,363,000	$ 82,746,000	$ 129,265,000
Other operating income	5,327,000	5,021,000	7,136,000
Interest income from real estate debt securities	369,000	2,018,000	1,782,000
Dividend income from real estate equity securities	6,099,000	6,002,000	2,531,000
Total revenues	93,158,000	95,787,000	140,714,000
Expenses:
Operating, maintenance, and management	29,294,000	29,110,000	42,611,000
Real estate taxes and insurance	12,631,000	11,762,000	17,404,000
Asset management fees to affiliate	8,158,000	8,525,000	10,686,000
General and administrative expenses	7,456,000	7,784,000	5,983,000
Foreign currency transaction loss (gain), net	12,498,000	(10,141,000)	15,298,000
Depreciation and amortization	34,004,000	35,006,000	53,446,000
Interest expense	28,849,000	31,054,000	37,149,000
Other-than-temporary impairment of debt securities	0	2,500,000	0
Total expenses	132,890,000	115,600,000	182,577,000
Other income (loss):
Income from NIP	0	428,000	2,073,000
Equity in income (loss) of unconsolidated entities	6,621,000	(9,830,000)	(6,037,000)
Casualty-related loss	(506,000)	0	0
Other interest income	2,120,000	1,884,000	1,105,000
Gain (loss) on real estate equity securities	20,379,000	(19,010,000)	0
Gain on sale of real estate	34,077,000	80,594,000	255,935,000
Loss on extinguishment of debt	(1,106,000)	(493,000)	(478,000)
Transaction and related costs	(4,462,000)	0	0
Subordinated performance fee due upon termination to affiliate	(32,640,000)	0	0
Total other income, net	24,483,000	53,573,000	252,598,000
Net (loss) income before income taxes	(15,249,000)	33,760,000	210,735,000
Income tax benefit (provision)	68,000	(436,000)	(155,000)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest, Total	(15,181,000)	33,324,000	210,580,000
Net (income) loss attributable to noncontrolling interests	(2,101,000)	222,000	64,000
Net (loss) income attributable to common stockholders	$ (17,282,000)	$ 33,546,000	$ 210,644,000
Net (loss) income per common share, basic and diluted (in dollars per share)	$ (0.26)	$ 0.57	$ 3.77
Weighted-average number of common shares outstanding, basic and diluted (in shares)	66,443,585	58,738,732	55,829,708