Quarterly report pursuant to Section 13 or 15(d)

Investments - Schedule of Fair Value Portfolio of Investments by Asset Class (Details)

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Investments - Schedule of Fair Value Portfolio of Investments by Asset Class (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Schedule Of Investments [Line Items]    
Investments at Fair Value $ 3,571,641 $ 3,248,046
Investment Type Concentration Risk | Total Investments Benchmark    
Schedule Of Investments [Line Items]    
Investments at Fair Value $ 3,571,641 $ 3,248,046
Percentage of Total Portfolio 100.00% 100.00%
Investment Type Concentration Risk | Total Investments Benchmark | Senior Secured Debt    
Schedule Of Investments [Line Items]    
Investments at Fair Value $ 3,312,225 $ 2,987,577
Percentage of Total Portfolio 92.70% 92.00%
Investment Type Concentration Risk | Total Investments Benchmark | Unsecured Debt    
Schedule Of Investments [Line Items]    
Investments at Fair Value $ 70,745 $ 69,722
Percentage of Total Portfolio 2.00% 2.20%
Investment Type Concentration Risk | Total Investments Benchmark | Preferred Stock    
Schedule Of Investments [Line Items]    
Investments at Fair Value $ 52,309 $ 53,038
Percentage of Total Portfolio 1.50% 1.60%
Investment Type Concentration Risk | Total Investments Benchmark | Common Stock    
Schedule Of Investments [Line Items]    
Investments at Fair Value $ 97,890 $ 99,132
Percentage of Total Portfolio 2.70% 3.10%
Investment Type Concentration Risk | Total Investments Benchmark | Warrants    
Schedule Of Investments [Line Items]    
Investments at Fair Value $ 32,693 $ 33,969
Percentage of Total Portfolio 0.90% 1.00%
Investment Type Concentration Risk | Total Investments Benchmark | Investment Funds & Vehicles    
Schedule Of Investments [Line Items]    
Investments at Fair Value $ 5,779 $ 4,608
Percentage of Total Portfolio 0.20% 0.10%