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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 9 Months Ended
Sep. 30, 2025
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Debt Instrument [Line Items]          
Interest expense   $ 5,514 $ 5,120 $ 14,042 $ 16,210
Deferred financing costs       1,058 909
4.875% Notes due 2026          
Debt Instrument [Line Items]          
Interest expense   1,316 1,316 3,949 3,949
Amortization of original issue discount   135 128 397 377
Deferred financing costs   56 68 166 201
Total interest and financing expenses   1,507 1,512 4,512 4,527
Average outstanding balance   $ 108,000 $ 108,000 $ 108,000 $ 108,000
Average stated interest rate   4.88% 4.88% 4.88% 4.88%
2026 Notes          
Debt Instrument [Line Items]          
Interest expense $ 625        
Amortization of original issue discount 39        
Deferred financing costs 37        
Total interest and financing expenses 701        
Average outstanding balance $ 50,000        
Average stated interest rate 6.00%        
2032 Convertible Notes          
Debt Instrument [Line Items]          
Interest expense $ 29        
Amortization of original issue discount 3        
Total interest and financing expenses 32        
Average outstanding balance $ 2,500        
Average stated interest rate 6.00%        
2018-2 Secured Notes          
Debt Instrument [Line Items]          
Interest expense     $ 952   $ 4,951
Amortization of original issue discount     11   57
Total interest and financing expenses     963   5,008
Average outstanding balance     $ 47,159   $ 81,937
Average stated interest rate     8.07%   7.99%
Great Lakes Portman Ridge Funding LLC Revolving Credit Facility          
Debt Instrument [Line Items]          
Interest expense   $ 2,423 $ 2,537 $ 7,697 $ 6,401
Deferred financing costs   124 108 373 274
Total interest and financing expenses   2,547 2,645 8,070 6,675
Average outstanding balance   $ 131,927 $ 121,856 $ 144,158 $ 102,134
Average stated interest rate   6.78% 7.99% 6.79% 8.01%
KeyBank Credit Facility          
Debt Instrument [Line Items]          
Interest expense $ 627        
Deferred financing costs 53        
Unused commitment fees 47        
Total interest and financing expenses 727        
Average outstanding balance $ 39,986        
Average stated interest rate 7.12%