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CONSOLIDATED SCHEDULE OF INVESTMENTS IN AND ADVANCES TO AFFILIATES - Summary of schedule of investment Parenthetical (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023 | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | --- | --- | ---
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Investment cost | $ 3,609,118 | $ 3,247,033 |  |
Investments, at fair value: | $ 3,568,539 | $ 3,248,046 |  |
Control investments |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Investment owned, percent of net assets | 5.99% | 6.38% |  |
Investment cost | $ 103,772 | $ 103,182 |  |
Investments, at fair value: | $ 111,259 | $ 115,004 | $ 90,923 | $ 76,458
Control investments | Majority Owned Control Investments |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Investment owned, percent of net assets | 5.37% | 5.74% |  |
Investment cost | $ 81,359 | $ 80,769 |  |
Investments, at fair value: | $ 99,725 | $ 103,487 | 83,850 | 68,416
Control investments | Other Control Investments |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Investment owned, percent of net assets | 0.62% | 0.64% |  |
Investment cost | $ 22,413 | $ 22,413 |  |
Investments, at fair value: | 11,534 | 11,517 | 7,073 | 8,042
Control investments | Coronado Aesthetics, LLC |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Investments, at fair value: | 186 |  | 297 |
Control investments | Coronado Aesthetics, LLC | Majority Owned Control Investments | Preferred Stock |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Investments, at fair value: | 185 | 260 | 292 | 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 | 5 | 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: | $ 186 | $ 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: | 185 | 260 |  |
Control investments | Gibraltar Business Capital, LLC |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Investments, at fair value: | 56,811 |  | 44,392 |
Control investments | Gibraltar Business Capital, LLC | Majority Owned Control Investments | Unsecured Debt |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Investments, at fair value: | 35,068 | 34,478 | 24,613 | 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: |  |  | 19,779 | 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: | 21,743 | 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 | 69,074 | 68,484 |  |
Investments, at fair value: | $ 56,811 | $ 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 | $ 25,509 | $ 25,000 |  |
Investment cost | 25,224 | 24,663 |  |
Investments, at fair value: | $ 25,224 | $ 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 | 9,844 | 9,815 |  |
Investments, at fair value: | $ 9,844 | $ 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: | 21,743 | 28,034 |  |
Control investments | Hercules Adviser LLC |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Investments, at fair value: | 42,728 |  | 39,161 |
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: | 30,728 | 28,713 | 27,161 | 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: | $ 42,728 | $ 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: | 30,728 | 28,713 |  |
Control investments | Tectura Corporation |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Investments, at fair value: | 11,534 |  | 7,073 |
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 | $ 7,073 | 8,042
Control investments | Tectura Corporation | Other Control Investments | Preferred Stock |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Investments, at fair value: | 3,279 | 3,263 |  | 0
Control investments | Tectura Corporation | Other Control Investments | Common Stock |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Investments, at fair value: | 5 | 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: | $ 11,534 | $ 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 | 2024-07 | 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: | $ 5 | $ 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: | $ 12 | $ 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: | $ 3,267 | $ 3,251 |  |

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