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CONSOLIDATED SCHEDULE OF INVESTMENTS IN AND ADVANCES TO AFFILIATES - Summary of schedule of investment (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Investments in and Advances to Affiliates [Line Items] |  |
Amount of Interest and Fees Credited to Income | $ 121,553 | $ 105,090
Investments, fair value, beginning balance | 3,248,046 |
Net Change in Unrealized Appreciation (Depreciation) | 3,634 | 21,105
Investments, fair value, ending balance | 3,571,641 |
Control investments |  |
Investments in and Advances to Affiliates [Line Items] |  |
Amount of Interest and Fees Credited to Income | 2,993 | 1,135
Realized Gain (Loss) | 0 | 0
Investments, fair value, beginning balance | 115,004 | 76,458
Gross Additions | 40 | 22
Gross Reductions | 0 | 0
Net Change in Unrealized Appreciation (Depreciation) | (2,829) | 8,846
Investments, fair value, ending balance | 112,215 | 85,326
Control investments | Majority Owned Control Investments |  |
Investments in and Advances to Affiliates [Line Items] |  |
Amount of Interest and Fees Credited to Income | 2,821 | 965
Realized Gain (Loss) | 0 | 0
Investments, fair value, beginning balance | 103,487 | 68,416
Gross Additions | 40 | 22
Gross Reductions | 0 | 0
Net Change in Unrealized Appreciation (Depreciation) | (3,429) | 9,114
Investments, fair value, ending balance | 100,098 | 77,552
Control investments | Other Control Investments |  |
Investments in and Advances to Affiliates [Line Items] |  |
Amount of Interest and Fees Credited to Income | 172 | 170
Realized Gain (Loss) | 0 | 0
Investments, fair value, beginning balance | 11,517 | 8,042
Gross Additions | 0 | 0
Gross Reductions | 0 | 0
Net Change in Unrealized Appreciation (Depreciation) | 600 | (268)
Investments, fair value, ending balance | 12,117 | 7,774
Coronado Aesthetics, LLC | Control investments |  |
Investments in and Advances to Affiliates [Line Items] |  |
Realized Gain (Loss) | 0 | 0
Net Change in Unrealized Appreciation (Depreciation) | 21 | (63)
Investments, fair value, ending balance | 283 | 256
Gibraltar Business Capital, LLC | Control investments |  |
Investments in and Advances to Affiliates [Line Items] |  |
Realized Gain (Loss) | 0 | 0
Net Change in Unrealized Appreciation (Depreciation) | (4,621) | 3,735
Investments, fair value, ending balance | 57,931 | 40,701
Hercules Adviser LLC | Control investments |  |
Investments in and Advances to Affiliates [Line Items] |  |
Realized Gain (Loss) | 0 | 0
Net Change in Unrealized Appreciation (Depreciation) | 1,171 | 5,442
Investments, fair value, ending balance | 41,884 | 36,595
Tectura Corporation | Control investments |  |
Investments in and Advances to Affiliates [Line Items] |  |
Realized Gain (Loss) | 0 | 0
Net Change in Unrealized Appreciation (Depreciation) | 600 | (268)
Investments, fair value, ending balance | 12,117 | 7,774
Preferred Stock | Coronado Aesthetics, LLC | Control investments | Majority Owned Control Investments |  |
Investments in and Advances to Affiliates [Line Items] |  |
Amount of Interest and Fees Credited to Income | 0 | 0
Realized Gain (Loss) | 0 | 0
Investments, fair value, beginning balance | 260 | 313
Gross Additions | 0 | 0
Gross Reductions | 0 | 0
Net Change in Unrealized Appreciation (Depreciation) | 22 | (60)
Investments, fair value, ending balance | 282 | 253
Preferred Stock | Gibraltar Business Capital, LLC | Control investments | Majority Owned Control Investments |  |
Investments in and Advances to Affiliates [Line Items] |  |
Amount of Interest and Fees Credited to Income |  | 0
Realized Gain (Loss) |  | 0
Investments, fair value, beginning balance |  | 14,137
Gross Additions |  | 0
Gross Reductions |  | 0
Net Change in Unrealized Appreciation (Depreciation) |  | 805
Investments, fair value, ending balance |  | 14,942
Preferred Stock | Tectura Corporation | Control investments | Other Control Investments |  |
Investments in and Advances to Affiliates [Line Items] |  |
Amount of Interest and Fees Credited to Income | 0 | 0
Realized Gain (Loss) | 0 | 0
Investments, fair value, beginning balance | 3,263 | 0
Gross Additions | 0 | 0
Gross Reductions | 0 | 0
Net Change in Unrealized Appreciation (Depreciation) | 593 | 0
Investments, fair value, ending balance | 3,856 |
Common Stock | Coronado Aesthetics, LLC | Control investments | Majority Owned Control Investments |  |
Investments in and Advances to Affiliates [Line Items] |  |
Amount of Interest and Fees Credited to Income | 0 | 0
Realized Gain (Loss) | 0 | 0
Investments, fair value, beginning balance | 2 | 6
Gross Additions | 0 | 0
Gross Reductions | 0 | 0
Net Change in Unrealized Appreciation (Depreciation) | (1) | (3)
Investments, fair value, ending balance | 1 | 3
Common Stock | Gibraltar Business Capital, LLC | Control investments | Majority Owned Control Investments |  |
Investments in and Advances to Affiliates [Line Items] |  |
Amount of Interest and Fees Credited to Income |  | 0
Realized Gain (Loss) |  | 0
Investments, fair value, beginning balance |  | 1,107
Gross Additions |  | 0
Gross Reductions |  | 0
Net Change in Unrealized Appreciation (Depreciation) |  | 63
Investments, fair value, ending balance |  | 1,170
Common Stock | Tectura Corporation | Control investments | Other Control Investments |  |
Investments in and Advances to Affiliates [Line Items] |  |
Amount of Interest and Fees Credited to Income | 0 | 0
Realized Gain (Loss) | 0 | 0
Investments, fair value, beginning balance | 4 | 0
Gross Additions | 0 | 0
Gross Reductions | 0 | 0
Net Change in Unrealized Appreciation (Depreciation) | 7 | 0
Investments, fair value, ending balance | 11 |
Member Units | Gibraltar Business Capital, LLC | Control investments | Majority Owned Control Investments |  |
Investments in and Advances to Affiliates [Line Items] |  |
Amount of Interest and Fees Credited to Income | 0 |
Realized Gain (Loss) | 0 |
Investments, fair value, beginning balance | 28,034 |
Gross Additions | 0 |
Gross Reductions | 0 |
Net Change in Unrealized Appreciation (Depreciation) | (4,621) |
Investments, fair value, ending balance | 23,413 |
Member Units | Hercules Adviser LLC | Control investments | Majority Owned Control Investments |  |
Investments in and Advances to Affiliates [Line Items] |  |
Amount of Interest and Fees Credited to Income | 0 | 0
Realized Gain (Loss) | 0 | 0
Investments, fair value, beginning balance | 28,713 | 19,153
Gross Additions | 0 | 0
Gross Reductions | 0 | 0
Net Change in Unrealized Appreciation (Depreciation) | 1,171 | 5,442
Investments, fair value, ending balance | 29,884 | 24,595
Unsecured Debt | Gibraltar Business Capital, LLC | Control investments | Majority Owned Control Investments |  |
Investments in and Advances to Affiliates [Line Items] |  |
Amount of Interest and Fees Credited to Income | 1,069 | 815
Realized Gain (Loss) | 0 | 0
Investments, fair value, beginning balance | 34,478 | 21,700
Gross Additions | 40 | 22
Gross Reductions | 0 | 0
Net Change in Unrealized Appreciation (Depreciation) | 0 | 2,867
Investments, fair value, ending balance | 34,518 | 24,589
Unsecured Debt | Hercules Adviser LLC | Control investments | Majority Owned Control Investments |  |
Investments in and Advances to Affiliates [Line Items] |  |
Amount of Interest and Fees Credited to Income | 1,752 | 150
Realized Gain (Loss) | 0 | 0
Investments, fair value, beginning balance | 12,000 | 12,000
Gross Additions | 0 | 0
Gross Reductions | 0 | 0
Net Change in Unrealized Appreciation (Depreciation) | 0 | 0
Investments, fair value, ending balance | 12,000 | 12,000
Senior Secured Debt | Tectura Corporation | Control investments | Other Control Investments |  |
Investments in and Advances to Affiliates [Line Items] |  |
Amount of Interest and Fees Credited to Income | 172 | 170
Realized Gain (Loss) | 0 | 0
Investments, fair value, beginning balance | 8,250 | 8,042
Gross Additions | 0 | 0
Gross Reductions | 0 | 0
Net Change in Unrealized Appreciation (Depreciation) | 0 | (268)
Investments, fair value, ending balance | $ 8,250 | $ 7,774

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