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Borrowings - Schedule of Interest Expense, Deferred Financing Costs, Average Outstanding Balance, and Average Stated Interest Rate (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Debt Instrument [Line Items] |  |  |
Interest expense | $ 20,782 | $ 25,306 | $ 17,701
Deferred financing costs | $ 1,231 | $ 1,219 | 1,223
Average stated interest rate | 6.20% | 7.00% |
4.875% Notes due 2026 |  |  |
Debt Instrument [Line Items] |  |  |
Interest expense | $ 5,265 | $ 5,265 | 5,265
Amortization of original issue discount | 506 | 479 | 454
Deferred financing costs | 263 | 256 | 247
Total interest and financing expenses | 6,034 | 6,000 | 5,966
Average outstanding balance | $ 108,000 | $ 108,000 | $ 108,000
Average stated interest rate | 4.88% | 4.88% | 4.88%
2018-2 Secured Notes |  |  |
Debt Instrument [Line Items] |  |  |
Interest expense | $ 4,952 | $ 11,357 | $ 6,736
Amortization of original issue discount | 57 | 151 | 177
Total interest and financing expenses | 5,009 | 11,508 | 6,913
Average outstanding balance | $ 96,356 | $ 153,330 | $ 187,661
Average stated interest rate | 7.99% | 7.35% | 3.51%
Great Lakes Portman Ridge Funding LLC Revolving Credit Facility |  |  |
Debt Instrument [Line Items] |  |  |
Interest expense | $ 9,334 | $ 7,465 | $ 4,477
Deferred financing costs | 405 | 333 | 345
Total interest and financing expenses | 9,739 | 7,798 | 4,822
Average outstanding balance | $ 116,548 | $ 80,136 | $ 88,821
Average stated interest rate | 7.67% | 7.84% | 4.53%

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