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 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Dec. 31, 2024
Schedule Of Investments [Line Items]            
Investments, at fair value: $ 4,583,870   $ 4,583,870   $ 4,466,647  
Interest & Dividend Income 138,042 $ 129,571 274,445 $ 245,143    
Fee Income 11,072 7,888 16,205 11,827    
Net Change in Unrealized Appreciation (Depreciation) 29,566 47,790 (15,439) 22,225    
Control investments            
Schedule Of Investments [Line Items]            
Investments, at fair value: 120,533 114,896 120,533 114,896 $ 115,051 $ 113,179
Interest & Dividend Income 3,464 3,368 6,863 7,005    
Fee Income 31 41 66 80    
Net Change in Unrealized Appreciation (Depreciation) (447) (836) (1,986) 1,141    
Realized Gain (Loss) 0 0 0 0    
Control investments | Coronado Aesthetics, LLC            
Schedule Of Investments [Line Items]            
Investments, at fair value: 222 313 222 313    
Interest & Dividend Income 0 0 0 0    
Fee Income 0 0 0 0    
Net Change in Unrealized Appreciation (Depreciation) 64 267 4 244    
Realized Gain (Loss) 0 0 0 0    
Control investments | Gibraltar Business Capital, LLC            
Schedule Of Investments [Line Items]            
Investments, at fair value: 62,744 60,343 62,744 60,343    
Interest & Dividend Income 1,141 1,096 2,269 2,663    
Fee Income 31 41 66 80    
Net Change in Unrealized Appreciation (Depreciation) 845 1,444 1,058 504    
Realized Gain (Loss) 0 0 0 0    
Control investments | Hercules Adviser LLC            
Schedule Of Investments [Line Items]            
Investments, at fair value: 48,535 44,222 48,535 44,222    
Interest & Dividend Income 2,152 2,100 4,253 4,000    
Fee Income 0 0 0 0    
Net Change in Unrealized Appreciation (Depreciation) (602) (795) (2,739) 2,032    
Realized Gain (Loss) 0 0 0 0    
Control investments | Tectura Corporation            
Schedule Of Investments [Line Items]            
Investments, at fair value: 9,032 10,018 9,032 10,018    
Interest & Dividend Income 171 172 341 342    
Fee Income 0 0 0 0    
Net Change in Unrealized Appreciation (Depreciation) (754) (1,752) (309) (1,639)    
Realized Gain (Loss) $ 0 $ 0 $ 0 $ 0