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Related Party Transactions (Details) $ in Thousands, £ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 31, 2020 USD ($) | Jan. 31, 2020 GBP (£) | Dec. 31, 2019 USD ($) | May 31, 2019 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2018 GBP (£) | Dec. 31, 2020 USD ($) | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related party expenses |  |  |  |  |  |  | $ 9,598 | $ 9,927 | $ 9,957 | $ 10,268 | $ 10,428 | $ 10,434 | $ 10,259 | $ 9,613 | $ 39,750 | $ 40,734 | $ 36,424
Base management fees incurred but not yet paid |  |  | $ 10,430 |  |  |  | 9,598 |  |  |  | 10,430 |  |  |  | $ 9,598 | 10,430 |
Sale of Mezzanine Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of loan | $ 81,300 | £ 62.2 | 30,300 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale Of Mezzanine Loan Two |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of loan |  |  | 122,300 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of Unfunded Commitment of Senior Mortgage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of loan | $ 65,300 | £ 50.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Arrangement fees |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related party expenses |  |  |  | $ 600 |  |  |  |  |  |  |  |  |  |  |  |  |
Affiliated Entity | Commercial Mortgage Portfolio Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Mortgage Notes Receivable |  |  |  |  | $ 6,400 | £ 4.8 |  |  |  |  |  |  |  |  |  |  |
Limited Liability Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rate of management fees |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.50% |  |
Extension period |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 year |  |
Period of termination |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 180 days |  |
Termination fee calculation period |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 24 months |  |
Limited Liability Company | Management fees |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Base management fees incurred but not yet paid |  |  | $ 10,400 |  |  |  | $ 9,600 |  |  |  | $ 10,400 |  |  |  | $ 9,600 | 10,400 |
Affiliated Entity | Management fees |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related party expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 39,800 | 40,700 | 36,400
Affiliated Entity | Reimbursements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related party expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,500 | $ 3,600 | $ 3,100

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- Definition Cash Flows between a transferor and a transferee attributable to newly transferred assets related to either a securitization, asset-backed financing arrangement, or similar transfer in which the transferor has continuing involvement with the transferred financial assets underlying the transaction (including, but not limited to, servicing, recourse, and restrictions on transferor's interests in the transferred financial assets). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=121570589&loc=d3e107207-111719 + Details
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