Quarterly report [Sections 13 or 15(d)]

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

v3.26.1
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, 2026
Mar. 31, 2025
Dec. 31, 2025
Dec. 31, 2024
Schedule Of Investments [Line Items]        
Investments, at fair value: $ 4,721,987   $ 4,466,647  
Interest & Dividend Income 136,403 $ 115,572    
Fee Income 5,133 3,939    
Net Change in Unrealized Appreciation (Depreciation) (45,005) (25,565)    
Control investments        
Schedule Of Investments [Line Items]        
Investments, at fair value: 116,248 115,734 $ 115,051 $ 113,179
Interest & Dividend Income 3,399 3,637    
Fee Income 35 39    
Net Change in Unrealized Appreciation (Depreciation) (1,539) 1,977    
Realized Gain (Loss) 0 0    
Control investments | Coronado Aesthetics, LLC        
Schedule Of Investments [Line Items]        
Investments, at fair value: 158 47    
Interest & Dividend Income 0 0    
Fee Income 0 0    
Net Change in Unrealized Appreciation (Depreciation) (60) (22)    
Realized Gain (Loss) 0 0    
Control investments | Gibraltar Business Capital, LLC        
Schedule Of Investments [Line Items]        
Investments, at fair value: 62,167 58,900    
Interest & Dividend Income 1,128 1,567    
Fee Income 35 39    
Net Change in Unrealized Appreciation (Depreciation) 213 (941)    
Realized Gain (Loss) 0 0    
Control investments | Hercules Adviser LLC        
Schedule Of Investments [Line Items]        
Investments, at fair value: 44,137 45,017    
Interest & Dividend Income 2,101 1,900    
Fee Income 0 0    
Net Change in Unrealized Appreciation (Depreciation) (2,137) 2,827    
Realized Gain (Loss) 0 0    
Control investments | Tectura Corporation        
Schedule Of Investments [Line Items]        
Investments, at fair value: 9,786 11,770    
Interest & Dividend Income 170 170    
Fee Income 0 0    
Net Change in Unrealized Appreciation (Depreciation) 445 113    
Realized Gain (Loss) $ 0 $ 0