Quarterly report pursuant to Section 13 or 15(d)

CONSOLIDATED SCHEDULE OF INVESTMENTS IN AND ADVANCES TO AFFILIATES - Summary of schedule of investment (Details)

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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