Quarterly report pursuant to Section 13 or 15(d)

Investments - Geographic Composition of Investments (Details)

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Investments - Geographic Composition of Investments (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Investment Holdings [Line Items]    
Amortized Cost $ 6,719,271 $ 5,860,186
Fair Value $ 6,653,479 $ 5,716,521
% of Total Investments at Fair Value 100.00% 100.00%
Fair Value as a % of Net Assets 180.02% 165.44%
Australia    
Investment Holdings [Line Items]    
Amortized Cost $ 271,364 $ 271,143
Fair Value $ 269,929 $ 269,430
% of Total Investments at Fair Value 4.06% 4.71%
Fair Value as a % of Net Assets 7.30% 7.80%
Canada    
Investment Holdings [Line Items]    
Amortized Cost $ 47,610 $ 40,335
Fair Value $ 45,540 $ 37,399
% of Total Investments at Fair Value 0.68% 0.65%
Fair Value as a % of Net Assets 1.23% 1.08%
France    
Investment Holdings [Line Items]    
Amortized Cost $ 24,544 $ 24,513
Fair Value $ 25,903 $ 25,139
% of Total Investments at Fair Value 0.39% 0.44%
Fair Value as a % of Net Assets 0.70% 0.73%
Italy    
Investment Holdings [Line Items]    
Amortized Cost $ 122,967 $ 122,826
Fair Value $ 130,071 $ 127,443
% of Total Investments at Fair Value 1.95% 2.23%
Fair Value as a % of Net Assets 3.52% 3.69%
Spain    
Investment Holdings [Line Items]    
Amortized Cost $ 31,383 $ 31,337
Fair Value $ 30,934 $ 29,958
% of Total Investments at Fair Value 0.46% 0.52%
Fair Value as a % of Net Assets 0.84% 0.87%
Taiwan    
Investment Holdings [Line Items]    
Amortized Cost $ 43,600 $ 43,619
Fair Value $ 41,709 $ 42,321
% of Total Investments at Fair Value 0.63% 0.74%
Fair Value as a % of Net Assets 1.13% 1.22%
United Kingdom    
Investment Holdings [Line Items]    
Amortized Cost $ 314,391 $ 240,099
Fair Value $ 321,822 $ 241,933
% of Total Investments at Fair Value 4.84% 4.23%
Fair Value as a % of Net Assets 8.71% 7.00%
United States    
Investment Holdings [Line Items]    
Amortized Cost $ 5,863,412 $ 5,086,314
Fair Value $ 5,787,571 $ 4,942,898
% of Total Investments at Fair Value 86.99% 86.48%
Fair Value as a % of Net Assets 156.59% 143.05%