Significant Accounting Policies (Schedule of Variable Interest Entities) (Details) $ in Thousands	Jun. 30, 2021 USD ($)
Straight-Line Rent Receivable [Member] | Bickford Senior Living [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity, Reporting Entity Involvement, Carrying Amount	$ (65,000)
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	88,000
Straight-Line Rent Receivable [Member] | Senior Living Communities [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity, Reporting Entity Involvement, Carrying Amount	(84,000)
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	93,000
Straight-Line Rent Receivable [Member] | Senior Living Management [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity, Reporting Entity Involvement, Carrying Amount	(27,000)
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	27,000
Notes Receivable [Member] | LCS Sagewood [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity, Reporting Entity Involvement, Carrying Amount	(117,000)
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	180,000
Notes Receivable [Member] | 41 Management [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity, Reporting Entity Involvement, Carrying Amount	(20,000)
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	34,000
Notes Receivable [Member] | Timber Ridge OpCo
Variable Interest Entity [Line Items]
Variable Interest Entity, Reporting Entity Involvement, Carrying Amount	(4,000)
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	5,000
Notes Receivable [Member] | Watermark Retirement [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity, Reporting Entity Involvement, Carrying Amount	(5,000)
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	10,000
Notes Receivable [Member] | Montecito Medical Real Estate
Variable Interest Entity [Line Items]
Variable Interest Entity, Reporting Entity Involvement, Carrying Amount	(2,000)
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	50,000
Notes Receivable [Member] | Vizion Health
Variable Interest Entity [Line Items]
Variable Interest Entity, Reporting Entity Involvement, Carrying Amount	(20,000)
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	22,000
Notes Receivable [Member] | Navion Senior Solutions [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity, Reporting Entity Involvement, Carrying Amount	(7,000)
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	$ 14,000