Quarterly report pursuant to Section 13 or 15(d)

Investments - Schedule of Fair Value Portfolio of Investments by Geographic Location (Details)

v3.23.3
Investments - Schedule of Fair Value Portfolio of Investments by Geographic Location (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2023
Dec. 31, 2022
Schedule Of Investments [Line Items]    
Investments at Fair Value $ 3,261,391 $ 2,963,955
Geographic Concentration Risk | Total Investments Benchmark, Geographical    
Schedule Of Investments [Line Items]    
Investments at Fair Value $ 3,261,391 $ 2,963,955
Percentage of Total Portfolio 100.00% 100.00%
Geographic Concentration Risk | United States | Total Investments Benchmark, Geographical    
Schedule Of Investments [Line Items]    
Investments at Fair Value $ 2,901,718 $ 2,670,520
Percentage of Total Portfolio 89.00% 90.10%
Geographic Concentration Risk | United Kingdom | Total Investments Benchmark, Geographical    
Schedule Of Investments [Line Items]    
Investments at Fair Value $ 201,853 $ 171,629
Percentage of Total Portfolio 6.30% 5.80%
Geographic Concentration Risk | Netherlands | Total Investments Benchmark, Geographical    
Schedule Of Investments [Line Items]    
Investments at Fair Value $ 88,986 $ 88,915
Percentage of Total Portfolio 2.70% 3.00%
Geographic Concentration Risk | Israel | Total Investments Benchmark, Geographical    
Schedule Of Investments [Line Items]    
Investments at Fair Value $ 52,967 $ 9,052
Percentage of Total Portfolio 1.60% 0.30%
Geographic Concentration Risk | Canada | Total Investments Benchmark, Geographical    
Schedule Of Investments [Line Items]    
Investments at Fair Value $ 10,222 $ 19,472
Percentage of Total Portfolio 0.30% 0.70%
Geographic Concentration Risk | Denmark | Total Investments Benchmark, Geographical    
Schedule Of Investments [Line Items]    
Investments at Fair Value $ 4,135 $ 0
Percentage of Total Portfolio 0.10% 0.00%
Geographic Concentration Risk | Germany | Total Investments Benchmark, Geographical    
Schedule Of Investments [Line Items]    
Investments at Fair Value $ 1,069 $ 990
Percentage of Total Portfolio 0.00% 0.00%
Geographic Concentration Risk | Other | Total Investments Benchmark, Geographical    
Schedule Of Investments [Line Items]    
Investments at Fair Value $ 441 $ 573
Percentage of Total Portfolio 0.00% 0.00%
Geographic Concentration Risk | Ireland | Total Investments Benchmark, Geographical    
Schedule Of Investments [Line Items]    
Investments at Fair Value $ 0 $ 2,804
Percentage of Total Portfolio 0.00% 0.10%