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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%