Quarterly report [Sections 13 or 15(d)]

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

v3.25.1
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