v3.26.3
Investments - Schedule of Fair Value, Assets Measured on Recurring Basis (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2026
Dec. 31, 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cost $ 1,638,824 [1] $ 1,942,096 [2]
Fair Value $ 1,501,652 [3] $ 1,812,990 [4]
Investments at Cost and Fair Value | Investment Portfolio Concentration    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Percentage of Investment Portfolio 100.00% 100.00%
Senior secured first lien debt    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cost $ 1,199,073 [1] $ 1,494,155 [2]
Fair Value $ 1,053,970 [3] $ 1,370,525 [4]
Senior secured first lien debt | Investments at Cost and Fair Value | Investment Portfolio Concentration    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Percentage of Investment Portfolio 71.60% 80.80%
Senior secured second lien debt    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cost $ 2,218 [1] $ 2,218 [2]
Fair Value $ 0 [3] $ 0 [4]
Senior secured second lien debt | Investments at Cost and Fair Value | Investment Portfolio Concentration    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Percentage of Investment Portfolio 0.00% 0.00%
Collateralized securities and structured products - equity    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cost $ 0 $ 4,969
Fair Value $ 0 $ 5,028
Collateralized securities and structured products - equity | Investments at Cost and Fair Value | Investment Portfolio Concentration    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Percentage of Investment Portfolio 0.00% 0.30%
Unsecured Debt    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cost $ 25,710 [1] $ 25,563 [2]
Fair Value $ 7,668 [3] $ 6,639 [4]
Unsecured Debt | Investments at Cost and Fair Value | Investment Portfolio Concentration    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Percentage of Investment Portfolio 0.50% 0.40%
Equity    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cost $ 381,426 [1] $ 299,181 [2]
Fair Value $ 409,617 [3] $ 314,788 [4]
Equity | Investments at Cost and Fair Value | Investment Portfolio Concentration    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Percentage of Investment Portfolio 27.90% 18.50%
Subtotal/total percentage    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cost $ 1,608,427 $ 1,826,086
Fair Value 1,471,255 1,696,980
Short Term Investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cost 30,397 [1] 116,010 [2]
Fair Value $ 30,397 [3] $ 116,010 [4]
[1] Represents amortized cost for debt securities and cost for equity investments.
[2] Represents amortized cost for debt securities and cost for equity investments.
[3] Fair value determined in good faith by CION Investment Management, LLC, or CIM, as the Company’s valuation designee, subject to oversight of the Company's board of directors (see Note 9 and Note 2), using significant unobservable inputs unless otherwise noted.
[4] Fair value determined in good faith by CIM, as the Company's valuation designee, subject to the oversight of the Company's board of directors (see Note 9 and Note 2), using significant unobservable inputs unless otherwise noted.