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CONSOLIDATED SCHEDULE OF INVESTMENTS IN AND ADVANCES TO AFFILIATES - Summary of schedule of investment - Parenthetical (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | --- | --- | ---
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Investment cost | $ 3,574,576 | $ 3,247,033 |  |
Investments, at fair value: | $ 3,571,641 | $ 3,248,046 |  |
Control investments |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Investment owned, percent of net assets | 5.95% | 6.38% |  |
Investment cost | $ 103,223 | $ 103,182 |  |
Investments, at fair value: | $ 112,215 | $ 115,004 | $ 85,326 | $ 76,458
Control investments | Majority Owned Control Investments |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Investment owned, percent of net assets | 5.31% | 5.74% |  |
Investment cost | $ 80,810 | $ 80,769 |  |
Investments, at fair value: | $ 100,098 | $ 103,487 | 77,552 | 68,416
Control investments | Other Control Investments |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Investment owned, percent of net assets | 0.64% | 0.64% |  |
Investment cost | $ 22,413 | $ 22,413 |  |
Investments, at fair value: | 12,117 | 11,517 | 7,774 | 8,042
Control investments | Coronado Aesthetics, LLC |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Investments, at fair value: | 283 |  | 256 |
Control investments | Coronado Aesthetics, LLC | Majority Owned Control Investments | Preferred Stock |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Investments, at fair value: | 282 | 260 | 253 | 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 | 3 | 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: | $ 283 | $ 262 |  |
Control investments | Coronado Aesthetics, LLC | Medical Devices & Equipment | Majority Owned Control Investments | Common Stock |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |
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 | 5,000,000 | 5,000,000 |  |
Investment cost | $ 250 | $ 250 |  |
Investments, at fair value: | 282 | 260 |  |
Control investments | Gibraltar Business Capital, LLC |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Investments, at fair value: | 57,931 |  | 40,701 |
Control investments | Gibraltar Business Capital, LLC | Majority Owned Control Investments | Unsecured Debt |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Investments, at fair value: | 34,518 | 34,478 | 24,589 | 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: |  |  | 14,942 | 14,137
Control investments | Gibraltar Business Capital, LLC | Majority Owned Control Investments | Common Stock |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Investments, at fair value: |  |  | 1,170 | 1,107
Control investments | Gibraltar Business Capital, LLC | Majority Owned Control Investments | Member Units |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Investments, at fair value: | 23,413 | 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 | 68,525 | 68,484 |  |
Investments, at fair value: | $ 57,931 | $ 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 | 11.50% | 11.50% |  |
Principal amount | $ 25,000 | $ 25,000 |  |
Investment cost | 24,689 | 24,663 |  |
Investments, at fair value: | $ 24,689 | $ 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 | 9,830 | 9,815 |  |
Investments, at fair value: | $ 9,829 | $ 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 | 1 | 1 |  |
Investment cost | $ 34,006 | $ 34,006 |  |
Investments, at fair value: | 23,413 | 28,034 |  |
Control investments | Hercules Adviser LLC |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Investments, at fair value: | 41,884 |  | 36,595 |
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: | 29,884 | 28,713 | 24,595 | 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: | $ 41,884 | $ 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 | 1 | 1 |  |
Investment cost | $ 35 | $ 35 |  |
Investments, at fair value: | 29,884 | 28,713 |  |
Control investments | Tectura Corporation |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Investments, at fair value: | 12,117 |  | 7,774 |
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 | $ 7,774 | 8,042
Control investments | Tectura Corporation | Other Control Investments | Preferred Stock |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Investments, at fair value: | 3,856 | 3,263 |  | 0
Control investments | Tectura Corporation | Other Control Investments | Common Stock |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Investments, at fair value: | 11 | 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: | $ 12,117 | $ 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 | 414,994,863 | 414,994,863 |  |
Investment cost | $ 900 | $ 900 |  |
Investments, at fair value: | $ 11 | $ 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 | 1,000,000 | 1,000,000 |  |
Investment cost | $ 0 | $ 0 |  |
Investments, at fair value: | $ 24 | $ 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 | 3,235,298 | 3,235,298 |  |
Investment cost | $ 13,263 | $ 13,263 |  |
Investments, at fair value: | $ 3,832 | $ 3,251 |  |

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