Annual report pursuant to Section 13 and 15(d)

Schedule 12-14s - CONSOLIDATED SCHEDULE OF INVESTMENTS IN AND ADVANCES TO AFFILIATES - Summary of Schedule of Investment (Details)

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Schedule 12-14s - CONSOLIDATED SCHEDULE OF INVESTMENTS IN AND ADVANCES TO AFFILIATES - Summary of Schedule of Investment (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Investments in and Advances to Affiliates [Line Items]      
Investment cost $ 3,708,877 $ 3,247,033  
Investments, at fair value: $ 3,659,978 $ 3,248,046  
Control investments      
Investments in and Advances to Affiliates [Line Items]      
Investment owned, percent of net assets 5.69% 6.38%  
Investment cost $ 104,916 $ 103,182  
Investments, at fair value: $ 113,179 $ 115,004 $ 76,458
Control investments | Majority Owned Control Investments      
Investments in and Advances to Affiliates [Line Items]      
Investment owned, percent of net assets 5.10% 5.74%  
Investment cost $ 82,503 $ 80,769  
Investments, at fair value: $ 101,522 $ 103,487 68,416
Control investments | Other Control Investments      
Investments in and Advances to Affiliates [Line Items]      
Investment owned, percent of net assets 0.59% 0.64%  
Investment cost $ 22,413 $ 22,413  
Investments, at fair value: 11,657 11,517 8,042
Control investments | Coronado Aesthetics, LLC      
Investments in and Advances to Affiliates [Line Items]      
Investments, at fair value: 69 262 319
Control investments | Coronado Aesthetics, LLC | Majority Owned Control Investments | Preferred Stock      
Investments in and Advances to Affiliates [Line Items]      
Investments, at fair value: 69 260 313
Control investments | Coronado Aesthetics, LLC | Majority Owned Control Investments | Common Stock      
Investments in and Advances to Affiliates [Line Items]      
Investments, at fair value: 0 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: $ 69 $ 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: $ 0 $ 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: 69 260  
Control investments | Gibraltar Acquisition LLC      
Investments in and Advances to Affiliates [Line Items]      
Investments, at fair value: 59,263 62,512  
Control investments | Gibraltar Acquisition LLC | Majority Owned Control Investments | Unsecured Debt      
Investments in and Advances to Affiliates [Line Items]      
Investments, at fair value: 36,212 34,478 21,700
Control investments | Gibraltar Acquisition LLC | Majority Owned Control Investments | Member Units      
Investments in and Advances to Affiliates [Line Items]      
Investments, at fair value: 23,051 28,034 15,244
Control investments | Gibraltar Acquisition LLC | Diversified Financial Services | Majority Owned Control Investments      
Investments in and Advances to Affiliates [Line Items]      
Investment cost 70,218 68,484  
Investments, at fair value: $ 59,263 $ 62,512  
Control investments | Gibraltar Acquisition 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%  
Interest rate paid in kind 8.05%    
Principal amount $ 26,569 $ 25,000  
Investment cost 26,337 24,663  
Investments, at fair value: $ 26,337 $ 24,663  
Control investments | Gibraltar Acquisition 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 9,875 9,815  
Investments, at fair value: $ 9,875 $ 9,815  
Control investments | Gibraltar Acquisition 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: 23,051 28,034  
Control investments | Hercules Adviser LLC      
Investments in and Advances to Affiliates [Line Items]      
Investments, at fair value: 42,190 40,713 31,153
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
Control investments | Hercules Adviser LLC | Majority Owned Control Investments | Member Units      
Investments in and Advances to Affiliates [Line Items]      
Investments, at fair value: 30,190 28,713 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: $ 42,190 $ 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: 30,190 28,713  
Control investments | Tectura Corporation      
Investments in and Advances to Affiliates [Line Items]      
Investments, at fair value: 11,657 11,517 8,042
Control investments | Tectura Corporation | Other Control Investments | Senior Secured Debt      
Investments in and Advances to Affiliates [Line Items]      
Investments, at fair value: 8,027 8,250 8,042
Control investments | Tectura Corporation | Other Control Investments | Preferred Stock      
Investments in and Advances to Affiliates [Line Items]      
Investments, at fair value: 3,623 3,263 0
Control investments | Tectura Corporation | Other Control Investments | Common Stock      
Investments in and Advances to Affiliates [Line Items]      
Investments, at fair value: 7 4 $ 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: $ 11,657 $ 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%    
Interest rate paid in kind   8.25%  
Principal amount $ 8,250 $ 8,250  
Investment cost 8,250 8,250  
Investments, at fair value: $ 8,027 $ 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: $ 7 $ 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: $ 17 $ 12  
Control investments | Tectura Corporation | Consumer & Business Services | Preferred Series C | 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: $ 3,606 $ 3,251