Quarterly report [Sections 13 or 15(d)]

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

v3.25.3
CONSOLIDATED SCHEDULE OF INVESTMENTS IN AND ADVANCES TO AFFILIATES - Summary of Schedule of Investment (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Sep. 30, 2024
Dec. 31, 2023
Investments in and Advances to Affiliates [Line Items]        
Investment owned, percent of net assets 196.64% [1] 0.03% [2]    
Investment cost $ 4,290,863 [3] $ 3,708,877    
Investments, at fair value: $ 4,306,154 $ 3,659,978    
Control investments        
Investments in and Advances to Affiliates [Line Items]        
Investment owned, percent of net assets 5.13% 5.69%    
Investment cost $ 105,460 $ 104,916    
Investments, at fair value: $ 112,323 $ 113,179 $ 113,097 $ 115,004
Control investments | Majority Owned Control Investments        
Investments in and Advances to Affiliates [Line Items]        
Investment owned, percent of net assets 4.75% 5.10%    
Investment cost $ 83,047 $ 82,503    
Investments, at fair value: $ 104,047 $ 101,522 101,054 103,487
Control investments | Other Control Investments        
Investments in and Advances to Affiliates [Line Items]        
Investment owned, percent of net assets 0.37% 0.59%    
Investment cost $ 22,413 $ 22,413    
Investments, at fair value: 8,276 11,657 12,043 11,517
Control investments | Coronado Aesthetics, LLC        
Investments in and Advances to Affiliates [Line Items]        
Investments, at fair value: 344   319  
Control investments | Coronado Aesthetics, LLC | Majority Owned Control Investments | Preferred Stock        
Investments in and Advances to Affiliates [Line Items]        
Investments, at fair value: 343 69 318 260
Control investments | Coronado Aesthetics, LLC | Majority Owned Control Investments | Common Stock        
Investments in and Advances to Affiliates [Line Items]        
Investments, at fair value: 1 0 1 2
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: $ 344 $ 69    
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 $ 0    
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: 343 69    
Control investments | Gibraltar Business Capital, LLC        
Investments in and Advances to Affiliates [Line Items]        
Investments, at fair value: 60,193   57,302  
Control investments | Gibraltar Business Capital, LLC | Majority Owned Control Investments | Unsecured Debt        
Investments in and Advances to Affiliates [Line Items]        
Investments, at fair value: 38,006 36,212 35,633 34,478
Control investments | Gibraltar Business Capital, LLC | Majority Owned Control Investments | Member Units        
Investments in and Advances to Affiliates [Line Items]        
Investments, at fair value: 22,187 23,051 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 70,762 70,218    
Investments, at fair value: $ 60,193 $ 59,263    
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% 3.45%    
Investment, interest rate, paid in kind 8.05% 8.05%    
Principal amount $ 28,224 $ 26,569    
Investment cost 28,081 26,337    
Investments, at fair value: $ 28,081 $ 26,337    
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 9,925 9,875    
Investments, at fair value: $ 9,925 $ 9,875    
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 $ 32,756 $ 34,006    
Investments, at fair value: 22,187 23,051    
Control investments | Hercules Adviser LLC        
Investments in and Advances to Affiliates [Line Items]        
Investments, at fair value: 43,510   43,433  
Control investments | Hercules Adviser LLC | Majority Owned Control Investments | Unsecured Debt        
Investments in and Advances to Affiliates [Line Items]        
Investments, at fair value: 0 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: 43,510 30,190 31,433 28,713
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: $ 43,510 $ 42,190    
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    
Interest rate and floor, fixed   5.00%    
Principal amount   $ 12,000    
Investment cost   12,000    
Investments, at fair value:   $ 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 $ 12,035 $ 35    
Investments, at fair value: 43,510 30,190    
Control investments | Tectura Corporation        
Investments in and Advances to Affiliates [Line Items]        
Investments, at fair value: 8,276   12,043  
Control investments | Tectura Corporation | Other Control Investments | Preferred Stock        
Investments in and Advances to Affiliates [Line Items]        
Investments, at fair value: 209 3,623 3,787 3,263
Control investments | Tectura Corporation | Other Control Investments | Common Stock        
Investments in and Advances to Affiliates [Line Items]        
Investments, at fair value: 0 7 6 4
Control investments | Tectura Corporation | Other Control Investments | Senior Secured Debt        
Investments in and Advances to Affiliates [Line Items]        
Investments, at fair value: 8,067 8,027 $ 8,250 $ 8,250
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: $ 8,276 $ 11,657    
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: $ 0 $ 7    
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 2027-01    
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: $ 8,067 $ 8,027    
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: $ 0 $ 17    
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: $ 209 $ 3,606    
[1] Value as a percent of net assets. All amounts are stated in U.S. Dollars unless otherwise noted. The Company uses the Standard Industrial Code for classifying the industry grouping of its portfolio companies.
[2] Value as a percent of net assets. All amounts are stated in U.S. Dollars unless otherwise noted. The Company uses the Standard Industrial Code for classifying the industry grouping of its portfolio companies.
[3] Gross unrealized appreciation, gross unrealized depreciation, and net unrealized appreciation for federal income tax purposes totaled $123.1 million, $108.1 million and $15.0 million, respectively. The tax cost of investments is $4.3 billion