Quarterly report pursuant to Section 13 or 15(d)

Investments - Industry Composition of Investments at Fair Value (Details)

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Investments - Industry Composition of Investments at Fair Value (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Schedule of Investments [Line Items]    
Fair Value $ 12,966,662 $ 9,289,410
% of Total Investments at Fair Value 100.00% 100.00%
Software and Computer Services    
Schedule of Investments [Line Items]    
Fair Value $ 2,245,201 $ 1,472,951
% of Total Investments at Fair Value 17.32% 15.86%
Industrial Support Services    
Schedule of Investments [Line Items]    
Fair Value $ 1,873,116 $ 1,063,701
% of Total Investments at Fair Value 14.45% 11.45%
Medical Equipment and Services    
Schedule of Investments [Line Items]    
Fair Value $ 1,239,507 $ 802,273
% of Total Investments at Fair Value 9.56% 8.64%
Health Care Providers    
Schedule of Investments [Line Items]    
Fair Value $ 1,150,262 $ 962,244
% of Total Investments at Fair Value 8.87% 10.36%
Consumer Services    
Schedule of Investments [Line Items]    
Fair Value $ 698,079 $ 627,950
% of Total Investments at Fair Value 5.38% 6.76%
Non-life Insurance    
Schedule of Investments [Line Items]    
Fair Value $ 660,323 $ 531,031
% of Total Investments at Fair Value 5.09% 5.72%
Investment Banking and Brokerage Services    
Schedule of Investments [Line Items]    
Fair Value $ 512,280 $ 160,345
% of Total Investments at Fair Value 3.95% 1.73%
General Industrials    
Schedule of Investments [Line Items]    
Fair Value $ 485,582 $ 405,330
% of Total Investments at Fair Value 3.74% 4.36%
Media    
Schedule of Investments [Line Items]    
Fair Value $ 436,575 $ 605,503
% of Total Investments at Fair Value 3.37% 6.52%
Aerospace and Defense    
Schedule of Investments [Line Items]    
Fair Value $ 409,342 $ 475,845
% of Total Investments at Fair Value 3.16% 5.12%
Pharmaceuticals and Biotechnology    
Schedule of Investments [Line Items]    
Fair Value $ 409,773 $ 268,572
% of Total Investments at Fair Value 3.16% 2.89%
Travel and Leisure    
Schedule of Investments [Line Items]    
Fair Value $ 367,623 $ 332,032
% of Total Investments at Fair Value 2.84% 3.57%
Industrial Engineering    
Schedule of Investments [Line Items]    
Fair Value $ 238,729 $ 254,138
% of Total Investments at Fair Value 1.84% 2.74%
Investments in Joint Ventures    
Schedule of Investments [Line Items]    
Fair Value $ 284,454 $ 124,003
% of Total Investments at Fair Value 2.19% 1.33%
Personal Care, Drug and Grocery Stores    
Schedule of Investments [Line Items]    
Fair Value $ 220,829 $ 120,098
% of Total Investments at Fair Value 1.70% 1.29%
Retailers    
Schedule of Investments [Line Items]    
Fair Value $ 182,184 $ 113,500
% of Total Investments at Fair Value 1.41% 1.22%
Food Producers    
Schedule of Investments [Line Items]    
Fair Value $ 171,465 $ 152,576
% of Total Investments at Fair Value 1.32% 1.64%
Industrial Transportation    
Schedule of Investments [Line Items]    
Fair Value $ 122,025 $ 33,196
% of Total Investments at Fair Value 0.94% 0.36%
Automobiles and Parts    
Schedule of Investments [Line Items]    
Fair Value $ 96,589 $ 112,957
% of Total Investments at Fair Value 0.74% 1.22%
Electricity    
Schedule of Investments [Line Items]    
Fair Value $ 101,728 $ 83,267
% of Total Investments at Fair Value 0.78% 0.90%
Asset Based Lending and Fund Finance    
Schedule of Investments [Line Items]    
Fair Value $ 71,925 $ 21,341
% of Total Investments at Fair Value 0.55% 0.23%
Telecommunications Equipment    
Schedule of Investments [Line Items]    
Fair Value $ 81,698 $ 14,880
% of Total Investments at Fair Value 0.63% 0.16%
Personal Goods    
Schedule of Investments [Line Items]    
Fair Value $ 87,141 $ 76,471
% of Total Investments at Fair Value 0.67% 0.82%
Technology Hardware and Equipment    
Schedule of Investments [Line Items]    
Fair Value $ 55,386 $ 70,623
% of Total Investments at Fair Value 0.43% 0.76%
Real Estate Investment and Services    
Schedule of Investments [Line Items]    
Fair Value $ 68,069 $ 39,500
% of Total Investments at Fair Value 0.52% 0.43%
Finance and Credit Services    
Schedule of Investments [Line Items]    
Fair Value $ 63,200 $ 59,003
% of Total Investments at Fair Value 0.49% 0.64%
Industrial Metals and Mining    
Schedule of Investments [Line Items]    
Fair Value $ 203,785 $ 11,895
% of Total Investments at Fair Value 1.57% 0.13%
Structured Finance    
Schedule of Investments [Line Items]    
Fair Value $ 60,960 $ 29,868
% of Total Investments at Fair Value 0.47% 0.32%
Construction and Materials    
Schedule of Investments [Line Items]    
Fair Value $ 185,999 $ 57,171
% of Total Investments at Fair Value 1.43% 0.62%
Oil, Gas and Coal    
Schedule of Investments [Line Items]    
Fair Value $ 49,270 $ 44,818
% of Total Investments at Fair Value 0.38% 0.48%
Gas, Water and Multi-utilities    
Schedule of Investments [Line Items]    
Fair Value $ 42,451 $ 43,604
% of Total Investments at Fair Value 0.33% 0.47%
Telecommunications Service Providers    
Schedule of Investments [Line Items]    
Fair Value $ 32,128 $ 70,997
% of Total Investments at Fair Value 0.25% 0.76%
Alternative Energy    
Schedule of Investments [Line Items]    
Fair Value $ 25,919 $ 16,743
% of Total Investments at Fair Value 0.20% 0.18%
Chemicals    
Schedule of Investments [Line Items]    
Fair Value $ 15,097 $ 15,157
% of Total Investments at Fair Value 0.12% 0.16%
Life Insurance    
Schedule of Investments [Line Items]    
Fair Value $ 8,789 $ 5,884
% of Total Investments at Fair Value 0.07% 0.06%
Household Goods and Home Construction    
Schedule of Investments [Line Items]    
Fair Value $ 7,186 $ 6,937
% of Total Investments at Fair Value 0.06% 0.07%
Leisure Goods    
Schedule of Investments [Line Items]    
Fair Value $ 1,993 $ 1,991
% of Total Investments at Fair Value 0.02% 0.02%
Electronic and Electrical Equipment    
Schedule of Investments [Line Items]    
Fair Value $ 0 $ 1,015
% of Total Investments at Fair Value 0.00% 0.01%