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Borrowings - Schedule of Debt Obligations (Parenthetical) (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022 | Jun. 23, 2021
--- | --- | --- | ---
2018-2 Secured Notes |  |  |
Debt Instrument [Line Items] |  |  |
Debt instruments, net of discount | $ 1,181 | $ 1,226 |
4.875% Notes Due 2026 |  |  |
Debt Instrument [Line Items] |  |  |
Debt instruments, net of discount | 1,585 | 1,704 | $ 2,430
Deferred financing costs, net | 756 | 818 |
Great Lakes Portman Ridge Funding LLC Revolving Credit Facility |  |  |
Debt Instrument [Line Items] |  |  |
Deferred financing costs, net | $ 1,024 | $ 1,107 |

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- Definition Amount, after accumulated amortization, of debt discount. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI https://asc.fasb.org/extlink&oid=124435984&loc=d3e28541-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI https://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1D -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495340-112611 + Details
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