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
Jun. 30, 2024
Dec. 31, 2023
Schedule of Investments [Line Items]    
Fair Value $ 11,122,205 $ 9,289,410
% of Total Investments at Fair Value 100.00% 100.00%
Software and Computer Services    
Schedule of Investments [Line Items]    
Fair Value $ 1,940,097 $ 1,472,951
% of Total Investments at Fair Value 17.43% 15.86%
Industrial Support Services    
Schedule of Investments [Line Items]    
Fair Value $ 1,341,955 $ 1,063,701
% of Total Investments at Fair Value 12.07% 11.45%
Medical Equipment and Services    
Schedule of Investments [Line Items]    
Fair Value $ 1,084,657 $ 802,273
% of Total Investments at Fair Value 9.75% 8.64%
Health Care Providers    
Schedule of Investments [Line Items]    
Fair Value $ 970,939 $ 962,244
% of Total Investments at Fair Value 8.73% 10.36%
Consumer Services    
Schedule of Investments [Line Items]    
Fair Value $ 668,993 $ 627,950
% of Total Investments at Fair Value 6.01% 6.76%
Non-life Insurance    
Schedule of Investments [Line Items]    
Fair Value $ 573,821 $ 531,031
% of Total Investments at Fair Value 5.16% 5.72%
Media    
Schedule of Investments [Line Items]    
Fair Value $ 498,845 $ 605,503
% of Total Investments at Fair Value 4.49% 6.52%
General Industrials    
Schedule of Investments [Line Items]    
Fair Value $ 497,131 $ 405,330
% of Total Investments at Fair Value 4.47% 4.36%
Investment Banking and Brokerage Services    
Schedule of Investments [Line Items]    
Fair Value $ 462,442 $ 160,345
% of Total Investments at Fair Value 4.16% 1.73%
Aerospace and Defense    
Schedule of Investments [Line Items]    
Fair Value $ 404,452 $ 475,845
% of Total Investments at Fair Value 3.64% 5.12%
Pharmaceuticals and Biotechnology    
Schedule of Investments [Line Items]    
Fair Value $ 275,428 $ 268,572
% of Total Investments at Fair Value 2.48% 2.89%
Travel and Leisure    
Schedule of Investments [Line Items]    
Fair Value $ 252,738 $ 332,032
% of Total Investments at Fair Value 2.27% 3.57%
Industrial Engineering    
Schedule of Investments [Line Items]    
Fair Value $ 242,301 $ 254,138
% of Total Investments at Fair Value 2.18% 2.74%
Investments in Joint Ventures    
Schedule of Investments [Line Items]    
Fair Value $ 238,639 $ 124,003
% of Total Investments at Fair Value 2.15% 1.33%
Personal Care, Drug and Grocery Stores    
Schedule of Investments [Line Items]    
Fair Value $ 218,901 $ 120,098
% of Total Investments at Fair Value 1.97% 1.29%
Retailers    
Schedule of Investments [Line Items]    
Fair Value $ 183,699 $ 113,500
% of Total Investments at Fair Value 1.65% 1.22%
Food Producers    
Schedule of Investments [Line Items]    
Fair Value $ 172,769 $ 152,576
% of Total Investments at Fair Value 1.55% 1.64%
Industrial Transportation    
Schedule of Investments [Line Items]    
Fair Value $ 119,173 $ 33,196
% of Total Investments at Fair Value 1.07% 0.36%
Automobiles and Parts    
Schedule of Investments [Line Items]    
Fair Value $ 96,781 $ 112,957
% of Total Investments at Fair Value 0.87% 1.22%
Electricity    
Schedule of Investments [Line Items]    
Fair Value $ 85,104 $ 83,267
% of Total Investments at Fair Value 0.77% 0.90%
Asset Based Lending and Fund Finance    
Schedule of Investments [Line Items]    
Fair Value $ 82,422 $ 21,341
% of Total Investments at Fair Value 0.74% 0.23%
Telecommunications Equipment    
Schedule of Investments [Line Items]    
Fair Value $ 81,241 $ 14,880
% of Total Investments at Fair Value 0.73% 0.16%
Personal Goods    
Schedule of Investments [Line Items]    
Fair Value $ 73,740 $ 76,471
% of Total Investments at Fair Value 0.66% 0.82%
Technology Hardware and Equipment    
Schedule of Investments [Line Items]    
Fair Value $ 71,214 $ 70,623
% of Total Investments at Fair Value 0.64% 0.76%
Real Estate Investment and Services    
Schedule of Investments [Line Items]    
Fair Value $ 67,217 $ 39,500
% of Total Investments at Fair Value 0.60% 0.43%
Finance and Credit Services    
Schedule of Investments [Line Items]    
Fair Value $ 62,137 $ 59,003
% of Total Investments at Fair Value 0.56% 0.64%
Industrial Metals and Mining    
Schedule of Investments [Line Items]    
Fair Value $ 60,429 $ 11,895
% of Total Investments at Fair Value 0.54% 0.13%
Structured Finance    
Schedule of Investments [Line Items]    
Fair Value $ 56,202 $ 29,868
% of Total Investments at Fair Value 0.51% 0.32%
Construction and Materials    
Schedule of Investments [Line Items]    
Fair Value $ 55,469 $ 57,171
% of Total Investments at Fair Value 0.50% 0.62%
Oil, Gas and Coal    
Schedule of Investments [Line Items]    
Fair Value $ 48,161 $ 44,818
% of Total Investments at Fair Value 0.43% 0.48%
Gas, Water and Multi-utilities    
Schedule of Investments [Line Items]    
Fair Value $ 43,018 $ 43,604
% of Total Investments at Fair Value 0.39% 0.47%
Telecommunications Service Providers    
Schedule of Investments [Line Items]    
Fair Value $ 30,877 $ 70,997
% of Total Investments at Fair Value 0.28% 0.76%
Alternative Energy    
Schedule of Investments [Line Items]    
Fair Value $ 27,856 $ 16,743
% of Total Investments at Fair Value 0.25% 0.18%
Chemicals    
Schedule of Investments [Line Items]    
Fair Value $ 15,149 $ 15,157
% of Total Investments at Fair Value 0.14% 0.16%
Life Insurance    
Schedule of Investments [Line Items]    
Fair Value $ 8,859 $ 5,884
% of Total Investments at Fair Value 0.08% 0.06%
Household Goods and Home Construction    
Schedule of Investments [Line Items]    
Fair Value $ 7,163 $ 6,937
% of Total Investments at Fair Value 0.06% 0.07%
Leisure Goods    
Schedule of Investments [Line Items]    
Fair Value $ 2,001 $ 1,991
% of Total Investments at Fair Value 0.02% 0.02%
Electronic and Electrical Equipment    
Schedule of Investments [Line Items]    
Fair Value $ 185 $ 1,015
% of Total Investments at Fair Value 0.00% 0.01%
Less than 0.01% of Total Investments at Fair Value 0.01%