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Borrowings - Schedule of Interest Expense, Deferred Financing Costs, Average Outstanding Balance, and Average Stated Interest Rate (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Debt Instrument [Line Items]        
Interest expense $ 4,230 $ 5,365 $ 8,528 $ 11,091
Deferred financing costs     621 595
4.875% Notes due 2026        
Debt Instrument [Line Items]        
Interest expense 1,317 1,317 2,633 2,633
Amortization of original issue discount 132 125 262 249
Deferred financing costs 55 67 110 133
Total interest and financing expenses 1,504 1,509 3,005 3,015
Average outstanding balance $ 108,000 $ 108,000 $ 108,000 $ 108,000
Average stated interest rate 4.88% 4.88% 4.88% 4.88%
2018-2 Secured Notes        
Debt Instrument [Line Items]        
Interest expense   $ 1,798   $ 3,999
Amortization of original issue discount   46   46
Total interest and financing expenses   1,844   4,045
Average outstanding balance   $ 88,686   $ 99,661
Average stated interest rate   8.03%   7.97%
Great Lakes Portman Ridge Funding LLC Revolving Credit Facility        
Debt Instrument [Line Items]        
Interest expense $ 2,601 $ 1,929 $ 5,274 $ 3,865
Deferred financing costs 125 83 249 166
Total interest and financing expenses 2,726 2,012 5,523 4,031
Average outstanding balance $ 147,379 $ 92,000 $ 150,425 $ 92,000
Average stated interest rate 6.79% 8.11% 6.80% 8.12%