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Significant Accounting Policies (Schedule of Variable Interest Entities) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Variable Interest Entity [Line Items]
Assets	$ 3,139,273	$ 3,042,235
Straight-Line Rent Receivable [Member] | Bickford Senior Living [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	75,275
Variable Interest Entity, Reporting Entity Involvement, Carrying Amount	(61,834)
Straight-Line Rent Receivable [Member] | Senior Living Communities [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	81,375
Variable Interest Entity, Reporting Entity Involvement, Carrying Amount	(75,546)
Straight-Line Rent Receivable [Member] | Senior Living Management [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	26,953
Variable Interest Entity, Reporting Entity Involvement, Carrying Amount	(26,953)
Notes Receivable [Member] | Evolve Senior Living [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	9,963
Variable Interest Entity, Reporting Entity Involvement, Carrying Amount	(9,963)
Notes Receivable [Member] | LCS Sagewood [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	178,780
Variable Interest Entity, Reporting Entity Involvement, Carrying Amount	(151,236)
Notes Receivable [Member] | 41 Management [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	11,488
Variable Interest Entity, Reporting Entity Involvement, Carrying Amount	(9,220)
Notes Receivable [Member] | Timber Ridge OpCo
Variable Interest Entity [Line Items]
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	3,858
Variable Interest Entity, Reporting Entity Involvement, Carrying Amount	(1,142)
Notes Receivable [Member] | Watermark Retirement [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	8,888
Variable Interest Entity, Reporting Entity Involvement, Carrying Amount	$ (3,888)

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