Quarterly report pursuant to Section 13 or 15(d)

CONSOLIDATED SCHEDULE OF INVESTMENTS IN AND ADVANCES TO AFFILIATES - Summary of Schedule of Investment Gain/(Loss) (Details)

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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 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Investments in and Advances to Affiliates [Line Items]        
Amount of Interest and Fees Credited to Income $ 125,248 $ 116,744 $ 371,807 $ 338,065
Investments, fair value, beginning balance     3,248,046  
Net Change in Unrealized Appreciation (Depreciation) (13,894) (46,240) (44,982) (6,277)
Investments, fair value, ending balance 3,560,513   3,560,513  
Control investments        
Investments in and Advances to Affiliates [Line Items]        
Amount of Interest and Fees Credited to Income     10,009 3,330
Realized Gain (Loss) 0 0 0 0
Investments, fair value, beginning balance     115,004 76,458
Gross Additions     1,155 14,372
Gross Reductions     0 0
Net Change in Unrealized Appreciation (Depreciation) 1,273 (1,099) (3,062) 12,320
Investments, fair value, ending balance 113,097 103,150 113,097 103,150
Control investments | Majority Owned Control Investments        
Investments in and Advances to Affiliates [Line Items]        
Amount of Interest and Fees Credited to Income     9,491 2,814
Realized Gain (Loss)     0 0
Investments, fair value, beginning balance     103,487 68,416
Gross Additions     1,155 14,372
Gross Reductions     0 0
Net Change in Unrealized Appreciation (Depreciation)     (3,588) 14,119
Investments, fair value, ending balance 101,054 96,907 101,054 96,907
Control investments | Other Control Investments        
Investments in and Advances to Affiliates [Line Items]        
Amount of Interest and Fees Credited to Income     518 516
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)     526 (1,799)
Investments, fair value, ending balance 12,043 6,243 12,043 6,243
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) 133 (50) 57 (72)
Investments, fair value, ending balance 319 247 319 247
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) (74) (1,726) (6,365) 4,676
Investments, fair value, ending balance 57,302 55,992 57,302 55,992
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) 705 1,507 2,720 9,515
Investments, fair value, ending balance 43,433 40,668 43,433 40,668
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) 509 (830) 526 (1,799)
Investments, fair value, ending balance 12,043 6,243 12,043 6,243
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)     58 (68)
Investments, fair value, ending balance 318 245 318 245
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       4,500
Gross Reductions       0
Net Change in Unrealized Appreciation (Depreciation)       1,809
Investments, fair value, ending balance   21,553   21,553
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)     524 0
Investments, fair value, ending balance 3,787 0 3,787 0
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) (4)
Investments, fair value, ending balance 1 2 1 2
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)     2 0
Investments, fair value, ending balance 6 0 6 0
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)     (6,365)  
Investments, fair value, ending balance 21,669   21,669  
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)     2,720 9,515
Investments, fair value, ending balance 31,433 28,668 31,433 28,668
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     4,034 2,359
Realized Gain (Loss)     0 0
Investments, fair value, beginning balance     34,478 21,700
Gross Additions     1,155 9,872
Gross Reductions     0 0
Net Change in Unrealized Appreciation (Depreciation)     0 2,867
Investments, fair value, ending balance 35,633 34,439 35,633 34,439
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     5,457 455
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     518 516
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 (1,799)
Investments, fair value, ending balance $ 8,250 $ 6,243 $ 8,250 $ 6,243