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Schedule IV - Mortgage Loans on Real Estate - Reconciliation of Mortgage Loans on Real Estate (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward] |  |  |
Balance at January 1 | $ 211,488 | $ 496,553 | $ 561,761
Additions: |  |  |
New mortgage loans |  | 32,942 | 19,975
Additions under existing mortgage loans | 6,482 | 20,958 | 72,574
Other | 4,233 | 7,455 | 25,867
Deductions: |  |  |
Collections of principal | (111,112) | (304,053) | (178,662)
Provision for loan losses | (24,237) | 166 | (4,930)
Transfers to real estate and equity investments | 0 | (42,501) | 0
Amortization of premium | (20) | (32) | (32)
Balance at December 31 | $ 86,834 | $ 211,488 | $ 496,553

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- Definition Amount of decrease in investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate, from collection of principal. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Footnote 6 -Subsection 29 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29(Footnote 6)) -URI https://asc.fasb.org/extlink&oid=120402547&loc=d3e617274-123014 + Details
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