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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Amount of Interest and Fees Credited to Income | $ 125,006 | $ 116,231 | $ 246,559 | $ 221,321
Investments, fair value, beginning balance |  |  | 3,248,046 |
Net Change in Unrealized Appreciation (Depreciation) | (34,722) | 18,858 | (31,088) | 39,963
Investments, fair value, ending balance | 3,568,539 |  | 3,568,539 |
Control investments |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Amount of Interest and Fees Credited to Income |  |  | 6,486 | 2,209
Realized Gain (Loss) | 0 | 0 | 0 | 0
Investments, fair value, beginning balance |  |  | 115,004 | 76,458
Gross Additions |  |  | 590 | 1,046
Gross Reductions |  |  | 0 | 0
Net Change in Unrealized Appreciation (Depreciation) | (1,506) | 4,573 | (4,335) | 13,419
Investments, fair value, ending balance | 111,259 | 90,923 | 111,259 | 90,923
Control investments | Majority Owned Control Investments |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Amount of Interest and Fees Credited to Income |  |  | 6,142 | 1,867
Realized Gain (Loss) |  |  | 0 | 0
Investments, fair value, beginning balance |  |  | 103,487 | 68,416
Gross Additions |  |  | 590 | 1,046
Gross Reductions |  |  | 0 | 0
Net Change in Unrealized Appreciation (Depreciation) |  |  | (4,352) | 14,388
Investments, fair value, ending balance | 99,725 | 83,850 | 99,725 | 83,850
Control investments | Other Control Investments |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Amount of Interest and Fees Credited to Income |  |  | 344 | 342
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) |  |  | 17 | (969)
Investments, fair value, ending balance | 11,534 | 7,073 | 11,534 | 7,073
Coronado Aesthetics, LLC | Control investments |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Realized Gain (Loss) | 0 | 0 | 0 | 0
Net Change in Unrealized Appreciation (Depreciation) | (97) | 41 | (76) | (22)
Investments, fair value, ending balance | 186 | 297 | 186 | 297
Gibraltar Business Capital, LLC | Control investments |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Realized Gain (Loss) | 0 | 0 | 0 | 0
Net Change in Unrealized Appreciation (Depreciation) | (1,670) | 2,667 | (6,291) | 6,402
Investments, fair value, ending balance | 56,811 | 44,392 | 56,811 | 44,392
Hercules Adviser LLC | Control investments |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Realized Gain (Loss) | 0 | 0 | 0 | 0
Net Change in Unrealized Appreciation (Depreciation) | 844 | 2,566 | 2,015 | 8,008
Investments, fair value, ending balance | 42,728 | 39,161 | 42,728 | 39,161
Tectura Corporation | Control investments |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Realized Gain (Loss) | 0 | 0 | 0 | 0
Net Change in Unrealized Appreciation (Depreciation) | (583) | (701) | 17 | (969)
Investments, fair value, ending balance | 11,534 | 7,073 | 11,534 | 7,073
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) |  |  | (75) | (21)
Investments, fair value, ending balance | 185 | 292 | 185 | 292
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 |  |  |  | 15,244
Gross Additions |  |  |  | 1,000
Gross Reductions |  |  |  | 0
Net Change in Unrealized Appreciation (Depreciation) |  |  |  | 3,535
Investments, fair value, ending balance |  | 19,779 |  | 19,779
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) |  |  | 16 | 0
Investments, fair value, ending balance | 3,279 |  | 3,279 |
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) | (1)
Investments, fair value, ending balance | 1 | 5 | 1 | 5
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) |  |  | 1 | 0
Investments, fair value, ending balance | 5 |  | 5 |
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) |  |  | (6,291) |
Investments, fair value, ending balance | 21,743 |  | 21,743 |
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) |  |  | 2,015 | 8,008
Investments, fair value, ending balance | 30,728 | 27,161 | 30,728 | 27,161
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 |  |  | 2,639 | 1,565
Realized Gain (Loss) |  |  | 0 | 0
Investments, fair value, beginning balance |  |  | 34,478 | 21,700
Gross Additions |  |  | 590 | 46
Gross Reductions |  |  | 0 | 0
Net Change in Unrealized Appreciation (Depreciation) |  |  | 0 | 2,867
Investments, fair value, ending balance | 35,068 | 24,613 | 35,068 | 24,613
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 |  |  | 3,503 | 302
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 | 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 |  |  | 344 | 342
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 | (969)
Investments, fair value, ending balance | $ 8,250 | $ 7,073 | $ 8,250 | $ 7,073

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