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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, 2023
Dec. 31, 2022
Dec. 31, 2021
Debt Instrument [Line Items]      
Interest expense $ 25,306 $ 17,701 $ 13,644
Deferred financing costs $ 1,219 $ 1,223 1,022
Average stated interest rate 7.00% 6.10%  
4.875% Notes Due 2026      
Debt Instrument [Line Items]      
Interest expense $ 5,265 $ 5,265 3,324
Amortization of original issue discount 479 454 273
Deferred financing costs 256 247 118
Total interest and financing expenses 6,000 5,966 3,715
Average outstanding balance $ 108,000 $ 108,000 $ 92,266
Average stated interest rate 4.88% 4.88% 4.88%
6.125% Notes Due 2022      
Debt Instrument [Line Items]      
Interest expense     $ 1,958
Deferred financing costs     75
Total interest and financing expenses     2,033
Average outstanding balance     $ 76,726
Average stated interest rate 0.00% 0.00% 6.13%
HCAP Notes      
Debt Instrument [Line Items]      
Interest expense     $ 220
Total interest expense     220
Average outstanding balance     $ 28,750
Average stated interest rate 0.00% 0.00% 6.13%
2018-2 Secured Notes      
Debt Instrument [Line Items]      
Interest expense $ 11,357 $ 6,736 $ 4,163
Amortization of original issue discount 151 177 190
Total interest and financing expenses 11,508 6,913 4,353
Average outstanding balance $ 153,330 $ 187,661 $ 163,863
Average stated interest rate 7.35% 3.51% 2.23%
Great Lakes Portman Ridge Funding LLC Revolving Credit Facility      
Debt Instrument [Line Items]      
Interest expense $ 7,465 $ 4,477 $ 2,957
Deferred financing costs 333 345 366
Total interest and financing expenses 7,798 4,822 3,323
Average outstanding balance $ 80,136 $ 88,821 $ 69,564
Average stated interest rate 7.84% 4.53% 3.03%