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
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Dec. 31, 2022
Schedule Of Investments [Line Items]        
Investments, at fair value: $ 3,571,641   $ 3,248,046  
Total fee income 5,774 $ 5,193    
Total net change in unrealized appreciation (depreciation) 3,634 21,105    
Control investments        
Schedule Of Investments [Line Items]        
Investments, at fair value: 112,215 85,326 $ 115,004 $ 76,458
Total interest and dividend income 2,957 1,116    
Total fee income 36 19    
Total net change in unrealized appreciation (depreciation) (2,829) 8,846    
Total net realized gain (loss) 0 0    
Control investments | Coronado Aesthetics, LLC        
Schedule Of Investments [Line Items]        
Investments, at fair value: 283 256    
Total interest and dividend income 0 0    
Total fee income 0 0    
Total net change in unrealized appreciation (depreciation) 21 (63)    
Total net realized gain (loss) 0 0    
Control investments | Gibraltar Business Capital, LLC        
Schedule Of Investments [Line Items]        
Investments, at fair value: 57,931 40,701    
Total interest and dividend income 1,033 796    
Total fee income 36 19    
Total net change in unrealized appreciation (depreciation) (4,621) 3,735    
Total net realized gain (loss) 0 0    
Control investments | Hercules Adviser LLC        
Schedule Of Investments [Line Items]        
Investments, at fair value: 41,884 36,595    
Total interest and dividend income 1,752 150    
Total fee income 0 0    
Total net change in unrealized appreciation (depreciation) 1,171 5,442    
Total net realized gain (loss) 0 0    
Control investments | Tectura Corporation        
Schedule Of Investments [Line Items]        
Investments, at fair value: 12,117 7,774    
Total interest and dividend income 172 170    
Total fee income 0 0    
Total net change in unrealized appreciation (depreciation) 600 (268)    
Total net realized gain (loss) $ 0 $ 0