Quarterly report pursuant to Section 13 or 15(d)

Investments - Investment Portfolio at Cost and Fair Value (Details)

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Investments - Investment Portfolio at Cost and Fair Value (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Schedule of Investments [Line Items]    
Amortized Cost $ 9,805,977 [1] $ 9,203,801 [2]
Fair Value $ 9,917,572 $ 9,289,410
% of Total Investments at Fair Value 100.00% 100.00%
First lien debt    
Schedule of Investments [Line Items]    
Amortized Cost $ 9,453,479 [1] $ 8,919,865 [2]
Fair Value $ 9,557,342 $ 9,002,695
% of Total Investments at Fair Value 96.37% 96.93%
Second lien debt    
Schedule of Investments [Line Items]    
Amortized Cost $ 36,422 [1] $ 64,782 [2]
Fair Value $ 36,495 $ 67,087
% of Total Investments at Fair Value 0.37% 0.72%
Other secured debt    
Schedule of Investments [Line Items]    
Amortized Cost $ 63,720 $ 0
Fair Value $ 63,719 $ 0
% of Total Investments at Fair Value 0.64% 0.00%
Unsecured debt    
Schedule of Investments [Line Items]    
Amortized Cost $ 29,523 $ 28,901
Fair Value $ 29,670 $ 29,101
% of Total Investments at Fair Value 0.30% 0.31%
Structured finance investments    
Schedule of Investments [Line Items]    
Amortized Cost $ 25,186 [1] $ 28,427 [2]
Fair Value $ 26,974 $ 29,868
% of Total Investments at Fair Value 0.27% 0.32%
Investments in joint ventures    
Schedule of Investments [Line Items]    
Amortized Cost $ 158,113 $ 125,513
Fair Value $ 163,291 $ 124,003
% of Total Investments at Fair Value 1.65% 1.33%
Equity investments    
Schedule of Investments [Line Items]    
Amortized Cost $ 39,534 [1] $ 36,313 [2]
Fair Value $ 40,081 $ 36,656
% of Total Investments at Fair Value 0.40% 0.39%
[1] The cost represents the original cost adjusted for the amortization of discounts and premiums, as applicable, on debt investments using the effective interest method in accordance with accounting principles generally accepted in the United States of America ("U.S. GAAP").
[2] The cost represents the original cost adjusted for the amortization of discounts and premiums, as applicable, on debt investments using the effective interest method in accordance with accounting principles generally accepted in the United States of America ("U.S. GAAP").