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Investments - Fair Value, Assets Measured on Recurring Basis (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2023
Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cost $ 1,865,013 [1] $ 1,803,609
Fair Value $ 1,788,462 [2] $ 1,760,030
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 $ 1,546,799 [1] $ 1,638,995
Fair Value $ 1,468,630 [2] $ 1,579,512
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 87.00% 90.30%
Senior secured second lien debt    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cost $ 41,153 [1] $ 41,036
Fair Value $ 39,544 [2] $ 38,769
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 2.30% 2.20%
Collateralized securities and structured products - equity    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cost $ 2,510 $ 2,687
Fair Value $ 1,046 $ 1,179
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 $ 34,635 [1] $ 30,427
Fair Value $ 17,301 [2] $ 22,643
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 1.00% 1.30%
Equity    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cost $ 139,145 [1] $ 79,595
Fair Value $ 161,170 [2] $ 107,058
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 9.60% 6.10%
Investments, Excluding Short-Term Investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cost $ 1,764,242 $ 1,792,740
Fair Value 1,687,691 1,749,161
Short term investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cost 100,771 [1] 10,869
Fair Value $ 100,771 [2] $ 10,869
[1] Represents amortized cost for debt securities and cost for equity investments.
[2] 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.