Segment Reporting (Reconciliation of Segment Activity) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Segment Reporting Information [Line Items]
Revenue from tenants	$ 100,235,000	$ 88,718,000
Property operating and maintenance	61,723,000	52,799,000
Net operating income	38,512,000	35,919,000
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)
Interest expense	(13,257,000)	(13,943,000)
Interest and other income	5,000	4,000
Gain on sale of real estate investments	2,306,000	6,078,000
Gain (loss) on non-designated derivatives	16,000	(43,000)
Income tax expense	(332,000)	(338,000)
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)
Medical Office Buildings
Segment Reporting Information [Line Items]
Revenue from tenants	26,370,000	25,257,000
Property operating and maintenance	7,610,000	6,947,000
Net operating income	18,760,000	18,310,000
Triple-Net Leased Healthcare Facilities
Segment Reporting Information [Line Items]
Revenue from tenants	4,707,000	3,536,000
Property operating and maintenance	1,474,000	411,000
Net operating income	3,233,000	3,125,000
Seniors Housing Communities
Segment Reporting Information [Line Items]
Revenue from tenants	69,158,000	59,925,000
Property operating and maintenance	52,639,000	45,441,000
Net operating income	$ 16,519,000	$ 14,484,000