Quarterly report pursuant to Section 13 or 15(d)

CONSOLIDATED SCHEDULE OF INVESTMENTS IN AND ADVANCES TO AFFILIATES - Summary of Schedule of Investment (Details)

v3.24.3
CONSOLIDATED SCHEDULE OF INVESTMENTS IN AND ADVANCES TO AFFILIATES - Summary of Schedule of Investment (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Sep. 30, 2023
Dec. 31, 2022
Investments in and Advances to Affiliates [Line Items]        
Investment cost $ 3,609,986 $ 3,247,033    
Investments, at fair value: $ 3,560,513 $ 3,248,046    
Control investments        
Investments in and Advances to Affiliates [Line Items]        
Investment owned, percent of net assets 6.11% 6.38%    
Investment cost $ 104,337 $ 103,182    
Investments, at fair value: $ 113,097 $ 115,004 $ 103,150 $ 76,458
Control investments | Majority Owned Control Investments        
Investments in and Advances to Affiliates [Line Items]        
Investment owned, percent of net assets 5.46% 5.74%    
Investment cost $ 81,924 $ 80,769    
Investments, at fair value: $ 101,054 $ 103,487 96,907 68,416
Control investments | Other Control Investments        
Investments in and Advances to Affiliates [Line Items]        
Investment owned, percent of net assets 0.65% 0.64%    
Investment cost $ 22,413 $ 22,413    
Investments, at fair value: 12,043 11,517 6,243 8,042
Control investments | Coronado Aesthetics, LLC        
Investments in and Advances to Affiliates [Line Items]        
Investments, at fair value: 319   247  
Control investments | Coronado Aesthetics, LLC | Majority Owned Control Investments | Preferred Stock        
Investments in and Advances to Affiliates [Line Items]        
Investments, at fair value: 318 260 245 313
Control investments | Coronado Aesthetics, LLC | Majority Owned Control Investments | Common Stock        
Investments in and Advances to Affiliates [Line Items]        
Investments, at fair value: 1 2 2 6
Control investments | Coronado Aesthetics, LLC | Medical Devices & Equipment | Majority Owned Control Investments        
Investments in and Advances to Affiliates [Line Items]        
Investment cost 250 250    
Investments, at fair value: $ 319 $ 262    
Control investments | Coronado Aesthetics, LLC | Medical Devices & Equipment | Majority Owned Control Investments | Common Stock        
Investments in and Advances to Affiliates [Line Items]        
Shares (in shares) 180,000 180,000    
Investment cost $ 0 $ 0    
Investments, at fair value: $ 1 $ 2    
Control investments | Coronado Aesthetics, LLC | Medical Devices & Equipment | Preferred Series A | Majority Owned Control Investments | Preferred Stock        
Investments in and Advances to Affiliates [Line Items]        
Shares (in shares) 5,000,000 5,000,000    
Investment cost $ 250 $ 250    
Investments, at fair value: 318 260    
Control investments | Gibraltar Business Capital, LLC        
Investments in and Advances to Affiliates [Line Items]        
Investments, at fair value: 57,302   55,992  
Control investments | Gibraltar Business Capital, LLC | Majority Owned Control Investments | Unsecured Debt        
Investments in and Advances to Affiliates [Line Items]        
Investments, at fair value: 35,633 34,478 34,439 21,700
Control investments | Gibraltar Business Capital, LLC | Majority Owned Control Investments | Preferred Stock        
Investments in and Advances to Affiliates [Line Items]        
Investments, at fair value:     21,553 15,244
Control investments | Gibraltar Business Capital, LLC | Majority Owned Control Investments | Member Units        
Investments in and Advances to Affiliates [Line Items]        
Investments, at fair value: 21,669 28,034    
Control investments | Gibraltar Business Capital, LLC | Diversified Financial Services | Majority Owned Control Investments        
Investments in and Advances to Affiliates [Line Items]        
Investment cost 69,639 68,484    
Investments, at fair value: $ 57,302 $ 62,512    
Control investments | Gibraltar Business Capital, LLC | Diversified Financial Services | Majority Owned Control Investments | Unsecured Debt One        
Investments in and Advances to Affiliates [Line Items]        
Maturity Date 2026-09 2026-09    
Interest rate and floor, fixed 3.45% 11.50%    
Investment, interest rate, paid in kind 8.05%      
Principal amount $ 26,033 $ 25,000    
Investment cost 25,774 24,663    
Investments, at fair value: $ 25,774 $ 24,663    
Control investments | Gibraltar Business Capital, LLC | Diversified Financial Services | Majority Owned Control Investments | Unsecured Debt Two        
Investments in and Advances to Affiliates [Line Items]        
Maturity Date 2026-09 2026-09    
Interest rate and floor, fixed 11.95% 11.95%    
Principal amount $ 10,000 $ 10,000    
Investment cost 9,859 9,815    
Investments, at fair value: $ 9,859 $ 9,815    
Control investments | Gibraltar Business Capital, LLC | Diversified Financial Services | Majority Owned Control Investments | Member Units        
Investments in and Advances to Affiliates [Line Items]        
Shares (in shares) 1 1    
Investment cost $ 34,006 $ 34,006    
Investments, at fair value: 21,669 28,034    
Control investments | Hercules Adviser LLC        
Investments in and Advances to Affiliates [Line Items]        
Investments, at fair value: 43,433   40,668  
Control investments | Hercules Adviser LLC | Majority Owned Control Investments | Unsecured Debt        
Investments in and Advances to Affiliates [Line Items]        
Investments, at fair value: 12,000 12,000 12,000 12,000
Control investments | Hercules Adviser LLC | Majority Owned Control Investments | Member Units        
Investments in and Advances to Affiliates [Line Items]        
Investments, at fair value: 31,433 28,713 28,668 19,153
Control investments | Hercules Adviser LLC | Diversified Financial Services | Majority Owned Control Investments        
Investments in and Advances to Affiliates [Line Items]        
Investment cost 12,035 12,035    
Investments, at fair value: $ 43,433 $ 40,713    
Control investments | Hercules Adviser LLC | Diversified Financial Services | Majority Owned Control Investments | Unsecured Debt        
Investments in and Advances to Affiliates [Line Items]        
Maturity Date 2025-06 2025-06    
Interest rate and floor, fixed 5.00% 5.00%    
Principal amount $ 12,000 $ 12,000    
Investment cost 12,000 12,000    
Investments, at fair value: $ 12,000 $ 12,000    
Control investments | Hercules Adviser LLC | Diversified Financial Services | Majority Owned Control Investments | Member Units        
Investments in and Advances to Affiliates [Line Items]        
Shares (in shares) 1 1    
Investment cost $ 35 $ 35    
Investments, at fair value: 31,433 28,713    
Control investments | Tectura Corporation        
Investments in and Advances to Affiliates [Line Items]        
Investments, at fair value: 12,043   6,243  
Control investments | Tectura Corporation | Other Control Investments | Senior Secured Debt        
Investments in and Advances to Affiliates [Line Items]        
Investments, at fair value: 8,250 8,250 6,243 8,042
Control investments | Tectura Corporation | Other Control Investments | Preferred Stock        
Investments in and Advances to Affiliates [Line Items]        
Investments, at fair value: 3,787 3,263 0 0
Control investments | Tectura Corporation | Other Control Investments | Common Stock        
Investments in and Advances to Affiliates [Line Items]        
Investments, at fair value: 6 4 $ 0 $ 0
Control investments | Tectura Corporation | Consumer & Business Services | Other Control Investments        
Investments in and Advances to Affiliates [Line Items]        
Investment cost 22,413 22,413    
Investments, at fair value: $ 12,043 $ 11,517    
Control investments | Tectura Corporation | Consumer & Business Services | Other Control Investments | Senior Secured Debt        
Investments in and Advances to Affiliates [Line Items]        
Maturity Date 2027-01 2024-07    
Interest rate and floor, fixed 8.25% 8.25%    
Principal amount $ 8,250 $ 8,250    
Investment cost 8,250 8,250    
Investments, at fair value: $ 8,250 $ 8,250    
Control investments | Tectura Corporation | Consumer & Business Services | Other Control Investments | Common Stock        
Investments in and Advances to Affiliates [Line Items]        
Shares (in shares) 414,994,863 414,994,863    
Investment cost $ 900 $ 900    
Investments, at fair value: $ 6 $ 4    
Control investments | Tectura Corporation | Consumer & Business Services | Preferred Series BB | Other Control Investments | Preferred Stock        
Investments in and Advances to Affiliates [Line Items]        
Shares (in shares) 1,000,000 1,000,000    
Investment cost $ 0 $ 0    
Investments, at fair value: $ 15 $ 12    
Control investments | Tectura Corporation | Consumer & Business Services | Series C Preferred Stock | Other Control Investments | Preferred Stock        
Investments in and Advances to Affiliates [Line Items]        
Shares (in shares) 3,235,298 3,235,298    
Investment cost $ 13,263 $ 13,263    
Investments, at fair value: $ 3,772 $ 3,251