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CONSOLIDATED SCHEDULE OF INVESTMENTS IN AND ADVANCES TO AFFILIATES - Summary of Schedule of Investment Gain/(Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2025 | Mar. 31, 2024
Investments in and Advances to Affiliates [Line Items] |  |
Amount of Interest and Fees Credited to Income | $ 119,511 | $ 121,553
Investments, fair value, beginning balance | 3,659,978 |
Net Change in Unrealized Appreciation (Depreciation) | (25,565) | 3,634
Investments, fair value, ending balance | 3,924,450 |
Control investments |  |
Investments in and Advances to Affiliates [Line Items] |  |
Amount of Interest and Fees Credited to Income | 3,676 | 2,993
Realized Gain (Loss) | 0 | 0
Investments, fair value, beginning balance | 113,179 | 115,004
Gross Additions | 12,578 | 40
Gross Reductions | (12,000) | 0
Net Change in Unrealized Appreciation (Depreciation) | 1,977 | (2,829)
Investments, fair value, ending balance | 115,734 | 112,215
Control investments | Majority Owned Control Investments |  |
Investments in and Advances to Affiliates [Line Items] |  |
Amount of Interest and Fees Credited to Income | 3,506 | 2,821
Realized Gain (Loss) | 0 | 0
Investments, fair value, beginning balance | 101,522 | 103,487
Gross Additions | 12,578 | 40
Gross Reductions | (12,000) | 0
Net Change in Unrealized Appreciation (Depreciation) | 1,864 | (3,429)
Investments, fair value, ending balance | 103,964 | 100,098
Control investments | Other Control Investments |  |
Investments in and Advances to Affiliates [Line Items] |  |
Amount of Interest and Fees Credited to Income | 170 | 172
Realized Gain (Loss) | 0 | 0
Investments, fair value, beginning balance | 11,657 | 11,517
Gross Additions | 0 | 0
Gross Reductions | 0 | 0
Net Change in Unrealized Appreciation (Depreciation) | 113 | 600
Investments, fair value, ending balance | 11,770 | 12,117
Coronado Aesthetics, LLC | Control investments |  |
Investments in and Advances to Affiliates [Line Items] |  |
Realized Gain (Loss) | 0 | 0
Net Change in Unrealized Appreciation (Depreciation) | (22) | 21
Investments, fair value, ending balance | 47 | 283
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) | (941) | (4,621)
Investments, fair value, ending balance | 58,900 | 57,931
Hercules Adviser LLC | Control investments |  |
Investments in and Advances to Affiliates [Line Items] |  |
Realized Gain (Loss) | 0 | 0
Net Change in Unrealized Appreciation (Depreciation) | 2,827 | 1,171
Investments, fair value, ending balance | 45,017 | 41,884
Tectura Corporation | Control investments |  |
Investments in and Advances to Affiliates [Line Items] |  |
Realized Gain (Loss) | 0 | 0
Net Change in Unrealized Appreciation (Depreciation) | 113 | 600
Investments, fair value, ending balance | 11,770 | 12,117
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 | 69 | 260
Gross Additions | 0 | 0
Gross Reductions | 0 | 0
Net Change in Unrealized Appreciation (Depreciation) | (22) | 22
Investments, fair value, ending balance | 47 | 282
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 | 3,623 | 3,263
Gross Additions | 0 | 0
Gross Reductions | 0 | 0
Net Change in Unrealized Appreciation (Depreciation) | 113 | 593
Investments, fair value, ending balance | 3,736 | 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 | 0 | 2
Gross Additions | 0 | 0
Gross Reductions | 0 | 0
Net Change in Unrealized Appreciation (Depreciation) | 0 | (1)
Investments, fair value, ending balance | 0 | 1
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 | 7 | 4
Gross Additions | 0 | 0
Gross Reductions | 0 | 0
Net Change in Unrealized Appreciation (Depreciation) | (5) | 7
Investments, fair value, ending balance | 2 | 11
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 | 1,606 | 1,069
Realized Gain (Loss) | 0 | 0
Investments, fair value, beginning balance | 36,212 | 34,478
Gross Additions | 578 | 40
Gross Reductions | 0 | 0
Net Change in Unrealized Appreciation (Depreciation) | 0 | 0
Investments, fair value, ending balance | 36,790 | 34,518
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 | 1,900 | 1,752
Realized Gain (Loss) | 0 | 0
Investments, fair value, beginning balance | 12,000 | 12,000
Gross Additions | 0 | 0
Gross Reductions | (12,000) | 0
Net Change in Unrealized Appreciation (Depreciation) | 0 | 0
Investments, fair value, ending balance | 0 | 12,000
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 | 0
Realized Gain (Loss) | 0 | 0
Investments, fair value, beginning balance | 23,051 | 28,034
Gross Additions | 0 | 0
Gross Reductions | 0 | 0
Net Change in Unrealized Appreciation (Depreciation) | (941) | (4,621)
Investments, fair value, ending balance | 22,110 | 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 | 30,190 | 28,713
Gross Additions | 12,000 | 0
Gross Reductions | 0 | 0
Net Change in Unrealized Appreciation (Depreciation) | 2,827 | 1,171
Investments, fair value, ending balance | 45,017 | 29,884
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 | 170 | 172
Realized Gain (Loss) | 0 | 0
Investments, fair value, beginning balance | 8,027 | 8,250
Gross Additions | 0 | 0
Gross Reductions | 0 | 0
Net Change in Unrealized Appreciation (Depreciation) | 5 | 0
Investments, fair value, ending balance | $ 8,032 | $ 8,250

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