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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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