Annual report pursuant to Section 13 and 15(d)

Investments - Schedule of Realized Gains and Losses and Changes in Unrealized Appreciation and Depreciation on Control and Affiliate investments (Details)

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Investments - Schedule of Realized Gains and Losses and Changes in Unrealized Appreciation and Depreciation on Control and Affiliate investments (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Schedule Of Investments [Line Items]      
Investments, at fair value: $ 3,659,978 $ 3,248,046  
Interest & Dividend Income 467,195 434,425 $ 307,258
Fee Income 26,396 26,243 14,430
Total net change in unrealized appreciation (depreciation) (31,209) 25,010 (85,063)
Control investments      
Schedule Of Investments [Line Items]      
Investments, at fair value: 113,179 115,004 76,458
Interest & Dividend Income 13,403    
Interest Income   4,642 4,621
Fee Income 146 95 68
Total net change in unrealized appreciation (depreciation) (3,559) 22,634 (278)
Net realized gain (loss) 0 0 0
Control investments | Coronado Aesthetics, LLC      
Schedule Of Investments [Line Items]      
Investments, at fair value: 69 262 319
Interest & Dividend Income 0    
Interest Income   0 0
Fee Income 0 0 0
Total net change in unrealized appreciation (depreciation) (193) (57) (246)
Net realized gain (loss) 0 0 0
Control investments | Gibraltar Acquisition LLC      
Schedule Of Investments [Line Items]      
Investments, at fair value: 59,263 62,512  
Interest & Dividend Income 5,301    
Interest Income   3,344  
Fee Income 146 95  
Total net change in unrealized appreciation (depreciation) (4,983) 9,656  
Net realized gain (loss) 0 0  
Control investments | Gibraltar Business Capital, LLC      
Schedule Of Investments [Line Items]      
Investments, at fair value:     36,944
Interest Income     3,385
Fee Income     68
Total net change in unrealized appreciation (depreciation)     (6,968)
Net realized gain (loss)     0
Control investments | Hercules Adviser LLC      
Schedule Of Investments [Line Items]      
Investments, at fair value: 42,190 40,713 31,153
Interest & Dividend Income 7,410    
Interest Income   608 546
Fee Income 0 0 0
Total net change in unrealized appreciation (depreciation) 1,477 9,560 7,163
Net realized gain (loss) 0 0 0
Control investments | Tectura Corporation      
Schedule Of Investments [Line Items]      
Investments, at fair value: 11,657 11,517 8,042
Interest & Dividend Income 692    
Interest Income   690 690
Fee Income 0 0 0
Total net change in unrealized appreciation (depreciation) 140 3,475 (227)
Net realized gain (loss) $ 0 $ 0 0
Investment, Affiliated Issuer      
Schedule Of Investments [Line Items]      
Investments, at fair value:     0
Interest Income     1,204
Fee Income     0
Total net change in unrealized appreciation (depreciation)     4,089
Net realized gain (loss)     1,758
Investment, Affiliated Issuer | Black Crow AI, Inc.      
Schedule Of Investments [Line Items]      
Investments, at fair value:     0
Interest Income     0
Fee Income     0
Total net change in unrealized appreciation (depreciation)     (120)
Net realized gain (loss)     3,772
Investment, Affiliated Issuer | Pineapple Energy LLC      
Schedule Of Investments [Line Items]      
Investments, at fair value:     0
Interest Income     1,204
Fee Income     0
Total net change in unrealized appreciation (depreciation)     4,209
Net realized gain (loss)     (2,014)
Control And Affiliate Issuer Investments Member      
Schedule Of Investments [Line Items]      
Investments, at fair value:     76,458
Interest Income     5,825
Fee Income     68
Total net change in unrealized appreciation (depreciation)     3,811
Net realized gain (loss)     $ 1,758