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 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Dec. 31, 2022
Schedule Of Investments [Line Items]            
Fair value of investments (in millions) $ 3,560,513   $ 3,560,513   $ 3,248,046  
Interest & Dividend Income 119,050 $ 110,339 352,358 $ 319,222    
Fee Income 6,198 6,405 19,449 18,843    
Net Change in Unrealized Appreciation (Depreciation) (13,894) (46,240) (44,982) (6,277)    
Control investments            
Schedule Of Investments [Line Items]            
Fair value of investments (in millions) 113,097 103,150 113,097 103,150 $ 115,004 $ 76,458
Interest & Dividend Income 3,487 1,099 9,901 3,270    
Fee Income 36 22 108 60    
Net Change in Unrealized Appreciation (Depreciation) 1,273 (1,099) (3,062) 12,320    
Realized Gain (Loss) 0 0 0 0    
Control investments | Coronado Aesthetics, LLC            
Schedule Of Investments [Line Items]            
Fair value of investments (in millions) 319 247 319 247    
Interest & Dividend Income 0 0 0 0    
Fee Income 0 0 0 0    
Net Change in Unrealized Appreciation (Depreciation) 133 (50) 57 (72)    
Realized Gain (Loss) 0 0 0 0    
Control investments | Gibraltar Business Capital, LLC            
Schedule Of Investments [Line Items]            
Fair value of investments (in millions) 57,302 55,992 57,302 55,992    
Interest & Dividend Income 1,359 772 3,926 2,299    
Fee Income 36 22 108 60    
Net Change in Unrealized Appreciation (Depreciation) (74) (1,726) (6,365) 4,676    
Realized Gain (Loss) 0 0 0 0    
Control investments | Hercules Adviser LLC            
Schedule Of Investments [Line Items]            
Fair value of investments (in millions) 43,433 40,668 43,433 40,668    
Interest & Dividend Income 1,954 153 5,457 455    
Fee Income 0 0 0 0    
Net Change in Unrealized Appreciation (Depreciation) 705 1,507 2,720 9,515    
Realized Gain (Loss) 0 0 0 0    
Control investments | Tectura Corporation            
Schedule Of Investments [Line Items]            
Fair value of investments (in millions) 12,043 6,243 12,043 6,243    
Interest & Dividend Income 174 174 518 516    
Fee Income 0 0 0 0    
Net Change in Unrealized Appreciation (Depreciation) 509 (830) 526 (1,799)    
Realized Gain (Loss) $ 0 $ 0 $ 0 $ 0