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Loans Receivable - 2021 Loans Receivable Transactions (Details) | 1 Months Ended | 3 Months Ended | 12 Months Ended
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Nov. 30, 2022 USD ($) | May 31, 2022 USD ($) | Nov. 30, 2021 USD ($) | Sep. 30, 2021 USD ($) loan | Jul. 31, 2021 USD ($) | May 31, 2021 USD ($) loan | Apr. 30, 2021 USD ($) loan property | Dec. 31, 2020 USD ($) loan | Mar. 31, 2022 USD ($) | Jun. 30, 2021 USD ($) loan | Mar. 31, 2020 USD ($) | Dec. 31, 2022 USD ($) loan | Dec. 31, 2021 USD ($) loan
Loans Receivable: |  |  |  |  |  |  |  |  |  |  |  |  |
Loans receivable |  |  |  |  |  |  |  |  |  |  |  | $ 374,832,000 | $ 415,811,000
Reserve for loans receivable |  |  |  |  |  |  |  | $ 10,280,000 |  |  |  | $ 8,280,000 | $ 1,813,000
Loss on sale of financing receivable |  |  |  |  |  |  |  |  | $ (23,000,000) |  | $ (42,000,000) |  |
Number of loans sold | loan |  |  |  | 1 |  |  |  |  |  |  |  | 2 | 6
Proceeds from sale of receivables |  |  |  | $ 2,000,000 |  |  |  |  |  |  |  |  |
Senior Housing Operating Portfolio | Mezzanine and Other | Discovery SHOP Portfolio |  |  |  |  |  |  |  |  |  |  |  |  |
Loans Receivable: |  |  |  |  |  |  |  |  |  |  |  |  |
Number of loans | loan |  |  |  |  |  |  | 2 |  |  |  |  |  |
Loss on sale of financing receivable |  |  |  |  |  |  | $ 0 |  |  |  |  |  |
Number of loans sold | property |  |  |  |  |  |  | 2 |  |  |  |  |  |
Secured Mortgage Loans |  |  |  |  |  |  |  |  |  |  |  |  |
Loans Receivable: |  |  |  |  |  |  |  |  |  |  |  |  |
Number of loans | loan |  |  |  |  |  |  |  | 1 |  | 2 |  |  |
Financing receivable, gross |  |  |  |  |  |  |  | $ 115,000,000 |  | $ 64,000,000 |  |  |
Decrease in financing receivable |  |  |  |  |  |  |  |  |  | 11,000,000 |  |  |
Loans receivable |  |  |  |  |  |  |  |  |  | 53,000,000 |  |  |
Reserve for loans receivable |  |  |  |  |  |  |  |  |  | $ 8,000,000 |  |  |
Loss on sale of financing receivable |  |  |  |  |  |  |  | 6,000,000 |  |  |  |  | $ 3,000,000
Proceeds from sale of receivables |  |  | $ 51,000,000 |  |  |  |  | $ 109,000,000 |  |  |  |  |
Principal repayments received | $ 1,000,000 | $ 2,000,000 |  | $ 15,000,000 | $ 8,000,000 | $ 10,000,000 |  |  |  |  |  |  |
Number of loans receivable | loan |  |  |  |  |  | 1 |  |  |  |  |  |  |

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- Definition Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446 + Details
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- Definition Amortized cost excluding accrued interest, before allowance for credit loss, of financing receivable. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919230-210447 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 3B -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL120267963-210447 + Details
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