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Investments - Schedule of Fair Value, Assets Measured on Recurring Basis (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cost $ 1,908,609 [1] $ 1,975,630 [2]
Fair Value $ 1,870,837 [3] $ 1,954,270 [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 $ 1,518,099 [1] $ 1,604,111 [2]
Fair Value $ 1,465,051 [3] $ 1,565,171 [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 84.20% 85.00%
Senior secured second lien debt    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cost $ 28,103 [1] $ 41,280 [2]
Fair Value $ 28,460 [3] $ 29,111 [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 1.60% 1.60%
Collateralized securities and structured products - equity    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cost $ 1,088 $ 2,362
Fair Value $ 1,004 $ 1,096
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 0.10% 0.10%
Unsecured debt    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cost $ 24,281 [1] $ 31,693 [2]
Fair Value $ 5,506 [3] $ 12,874 [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 0.30% 0.70%
Equity    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cost $ 206,901 [1] $ 182,738 [2]
Fair Value $ 240,679 [3] $ 232,572 [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 13.80% 12.60%
Investments, Excluding Short-Term Investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cost $ 1,778,472 $ 1,862,184
Fair Value 1,740,700 1,840,824
Short term investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cost 130,137 [1] 113,446 [2]
Fair Value $ 130,137 [3] $ 113,446 [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 the Company’s board of directors (see Note 9), including via delegation to CIM as the Company’s valuation designee (see Note 2), using significant unobservable inputs unless otherwise noted.
[4] Fair value determined in good faith by the Company’s board of directors (see Note 9), including via delegation to CIM as the Company’s valuation designee (see Note 2), using significant unobservable inputs unless otherwise noted.