Quarterly report pursuant to Section 13 or 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
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Dec. 31, 2022
Schedule Of Investments [Line Items]            
Fair value $ 3,568,539   $ 3,568,539   $ 3,248,046  
Interest & Dividend Income 117,529 $ 108,986 233,308 $ 208,883    
Fee Income 7,477 7,245 13,251 12,438    
Net Change in Unrealized Appreciation (Depreciation) (34,722) 18,858 (31,088) 39,963    
Control investments            
Schedule Of Investments [Line Items]            
Fair value 111,259 90,923 111,259 90,923 $ 115,004 $ 76,458
Interest & Dividend Income 3,457 1,055 6,414 2,171    
Fee Income 36 19 72 38    
Net Change in Unrealized Appreciation (Depreciation) (1,506) 4,573 (4,335) 13,419    
Realized Gain (Loss) 0 0 0 0    
Control investments | Coronado Aesthetics, LLC            
Schedule Of Investments [Line Items]            
Fair value 186 297 186 297    
Interest & Dividend Income 0 0 0 0    
Fee Income 0 0 0 0    
Net Change in Unrealized Appreciation (Depreciation) (97) 41 (76) (22)    
Realized Gain (Loss) 0 0 0 0    
Control investments | Gibraltar Business Capital, LLC            
Schedule Of Investments [Line Items]            
Fair value 56,811 44,392 56,811 44,392    
Interest & Dividend Income 1,534 731 2,567 1,527    
Fee Income 36 19 72 38    
Net Change in Unrealized Appreciation (Depreciation) (1,670) 2,667 (6,291) 6,402    
Realized Gain (Loss) 0 0 0 0    
Control investments | Hercules Adviser LLC            
Schedule Of Investments [Line Items]            
Fair value 42,728 39,161 42,728 39,161    
Interest & Dividend Income 1,751 152 3,503 302    
Fee Income 0 0 0 0    
Net Change in Unrealized Appreciation (Depreciation) 844 2,566 2,015 8,008    
Realized Gain (Loss) 0 0 0 0    
Control investments | Tectura Corporation            
Schedule Of Investments [Line Items]            
Fair value 11,534 7,073 11,534 7,073    
Interest & Dividend Income 172 172 344 342    
Fee Income 0 0 0 0    
Net Change in Unrealized Appreciation (Depreciation) (583) (701) 17 (969)    
Realized Gain (Loss) $ 0 $ 0 $ 0 $ 0