Segment Reporting (Reconciliation of Segment Activity) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Segment Reporting Information [Line Items]
Revenue from tenants	$ 83,650	$ 83,436
Property operating and maintenance	53,090	49,355
Net operating income	30,560	34,081
Impairment charges	(10,644)	(878)
Operating fees to related parties	(6,318)	(5,883)
Acquisition and transaction related	(579)	(132)
General and administrative	(4,899)	(6,052)
Depreciation and amortization	(20,420)	(20,102)
Interest expense	(11,764)	(12,322)
Interest and other income	12	52
Losses on sale of real estate investments	(303)	(172)
Gains on non-designated derivative instruments	994	14
Income tax expense	(39)	(48)
Net loss (income) attributable to non-controlling interests	49	(46)
Allocation for preferred stock	(3,450)	(742)
Net loss attributable to common stockholders	(26,801)	(12,230)
Medical office buildings
Segment Reporting Information [Line Items]
Revenue from tenants	32,348	30,339
Property operating and maintenance	8,689	8,843
Net operating income	23,659	21,496
Seniors housing - operating properties
Segment Reporting Information [Line Items]
Revenue from tenants	51,302	53,097
Property operating and maintenance	44,401	40,512
Net operating income	$ 6,901	$ 12,585