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Loans Receivable - 2020 Loans Receivable Transactions (Details) |  | 1 Months Ended | 3 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Nov. 03, 2020 USD ($) | Dec. 31, 2020 USD ($) property | Nov. 30, 2020 USD ($) property | Mar. 31, 2020 USD ($) property | Jan. 31, 2020 USD ($) property | Dec. 31, 2019 USD ($) | Oct. 31, 2019 property
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |
Property count | property |  |  |  |  | 15 |  |
Loans receivable including loans receivable held for sale |  | $ 195,375,000 |  |  |  | $ 190,579,000 |
Loss on sale of direct financing lease |  |  |  | $ (42,000,000) |  |  |
Mezzanine |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |
Number of loan receivables | property |  |  | 1 |  |  |  |
Total |  |  | $ 10,000,000 |  |  |  |
Proceeds from sale of receivables |  |  | $ 8,000,000 |  |  |  |
Loss on sale of direct financing lease | $ 2,000,000 |  |  |  |  |  |
Secured Mortgage Loans |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |
Number of loan receivables | property |  | 1 |  |  |  |  |
Total |  | $ 115,000,000 |  |  |  |  |
Proceeds from sale of receivables |  | 109,000,000 |  |  |  |  |
Loss on sale of direct financing lease |  | $ 6,000,000 |  |  |  |  |
Assets leased to others | Other Non-Reporting Segment |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |
Property count | property |  |  |  | 1 |  |  |
CCRC JV Investment | Assets leased to others | Other Non-Reporting Segment |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |
Property count | property |  |  |  | 15 |  |  | 15
Brookedale MTCA | Assets leased to others | Other Non-Reporting Segment |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |
Property count | property |  |  |  |  | 13 |  |
Brookedale MTCA | CCRC JV Investment |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |
Property count | property |  |  |  |  | 15 |  |
Brookedale MTCA | CCRC JV Investment | Assets leased to others | Other Non-Reporting Segment |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |
Property count | property |  | 13 |  | 13 | 13 |  |
Loans receivable including loans receivable held for sale |  | $ 23,000,000 |  |  | $ 30,000,000 |  |

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