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
Mar. 31, 2024
Dec. 31, 2023
Schedule of Investments [Line Items]    
Fair Value $ 9,917,572 $ 9,289,410
% of Total Investments at Fair Value 100.00% 100.00%
Software and Computer Services    
Schedule of Investments [Line Items]    
Fair Value $ 1,390,485 $ 1,472,951
% of Total Investments at Fair Value 14.03% 15.86%
Industrial Support Services    
Schedule of Investments [Line Items]    
Fair Value $ 1,308,525 $ 1,063,701
% of Total Investments at Fair Value 13.20% 11.45%
Medical Equipment and Services    
Schedule of Investments [Line Items]    
Fair Value $ 1,065,485 $ 802,273
% of Total Investments at Fair Value 10.74% 8.64%
Health Care Providers    
Schedule of Investments [Line Items]    
Fair Value $ 955,360 $ 962,244
% of Total Investments at Fair Value 9.63% 10.36%
Consumer Services    
Schedule of Investments [Line Items]    
Fair Value $ 652,303 $ 627,950
% of Total Investments at Fair Value 6.58% 6.76%
Media    
Schedule of Investments [Line Items]    
Fair Value $ 587,511 $ 605,503
% of Total Investments at Fair Value 5.92% 6.52%
Non-life Insurance    
Schedule of Investments [Line Items]    
Fair Value $ 552,377 $ 531,031
% of Total Investments at Fair Value 5.57% 5.72%
General Industrials    
Schedule of Investments [Line Items]    
Fair Value $ 498,137 $ 405,330
% of Total Investments at Fair Value 5.02% 4.36%
Aerospace and Defense    
Schedule of Investments [Line Items]    
Fair Value $ 395,885 $ 475,845
% of Total Investments at Fair Value 3.99% 5.12%
Pharmaceuticals and Biotechnology    
Schedule of Investments [Line Items]    
Fair Value $ 263,726 $ 268,572
% of Total Investments at Fair Value 2.66% 2.89%
Industrial Engineering    
Schedule of Investments [Line Items]    
Fair Value $ 246,748 $ 254,138
% of Total Investments at Fair Value 2.49% 2.74%
Investment Banking and Brokerage Services    
Schedule of Investments [Line Items]    
Fair Value $ 232,193 $ 160,345
% of Total Investments at Fair Value 2.34% 1.73%
Travel and Leisure    
Schedule of Investments [Line Items]    
Fair Value $ 204,542 $ 332,032
% of Total Investments at Fair Value 2.06% 3.57%
Food Producers    
Schedule of Investments [Line Items]    
Fair Value $ 172,029 $ 152,576
% of Total Investments at Fair Value 1.73% 1.64%
Investments in joint ventures    
Schedule of Investments [Line Items]    
Fair Value $ 163,291 $ 124,003
% of Total Investments at Fair Value 1.65% 1.33%
Retailers    
Schedule of Investments [Line Items]    
Fair Value $ 154,508 $ 113,500
% of Total Investments at Fair Value 1.56% 1.22%
Industrial Transportation    
Schedule of Investments [Line Items]    
Fair Value $ 117,424 $ 33,196
% of Total Investments at Fair Value 1.18% 0.36%
Personal Care, Drug and Grocery Stores    
Schedule of Investments [Line Items]    
Fair Value $ 116,248 $ 120,098
% of Total Investments at Fair Value 1.17% 1.29%
Electricity    
Schedule of Investments [Line Items]    
Fair Value $ 104,950 $ 83,267
% of Total Investments at Fair Value 1.06% 0.90%
Automobiles and Parts    
Schedule of Investments [Line Items]    
Fair Value $ 100,459 $ 112,957
% of Total Investments at Fair Value 1.01% 1.22%
Asset Based Lending and Fund Finance    
Schedule of Investments [Line Items]    
Fair Value $ 84,897 $ 21,341
% of Total Investments at Fair Value 0.86% 0.23%
Personal Goods    
Schedule of Investments [Line Items]    
Fair Value $ 73,431 $ 76,471
% of Total Investments at Fair Value 0.74% 0.82%
Technology Hardware and Equipment    
Schedule of Investments [Line Items]    
Fair Value $ 72,751 $ 70,623
% of Total Investments at Fair Value 0.73% 0.76%
Finance and Credit Services    
Schedule of Investments [Line Items]    
Fair Value $ 60,113 $ 59,003
% of Total Investments at Fair Value 0.61% 0.64%
Construction and Materials    
Schedule of Investments [Line Items]    
Fair Value $ 56,447 $ 57,171
% of Total Investments at Fair Value 0.57% 0.62%
Oil, Gas and Coal    
Schedule of Investments [Line Items]    
Fair Value $ 46,736 $ 44,818
% of Total Investments at Fair Value 0.47% 0.48%
Telecommunications Service Providers    
Schedule of Investments [Line Items]    
Fair Value $ 45,514 $ 70,997
% of Total Investments at Fair Value 0.46% 0.76%
Gas, Water and Multi-utilities    
Schedule of Investments [Line Items]    
Fair Value $ 42,421 $ 43,604
% of Total Investments at Fair Value 0.43% 0.47%
Real Estate Investment and Services    
Schedule of Investments [Line Items]    
Fair Value $ 39,400 $ 39,500
% of Total Investments at Fair Value 0.40% 0.43%
Structured Finance    
Schedule of Investments [Line Items]    
Fair Value $ 26,974 $ 29,868
% of Total Investments at Fair Value 0.27% 0.32%
Industrial Metals and Mining    
Schedule of Investments [Line Items]    
Fair Value $ 24,330 $ 11,895
% of Total Investments at Fair Value 0.25% 0.13%
Alternative Energy    
Schedule of Investments [Line Items]    
Fair Value $ 16,203 $ 16,743
% of Total Investments at Fair Value 0.16% 0.18%
Chemicals    
Schedule of Investments [Line Items]    
Fair Value $ 15,147 $ 15,157
% of Total Investments at Fair Value 0.15% 0.16%
Telecommunications Equipment    
Schedule of Investments [Line Items]    
Fair Value $ 14,851 $ 14,880
% of Total Investments at Fair Value 0.15% 0.16%
Household Goods and Home Construction    
Schedule of Investments [Line Items]    
Fair Value $ 7,286 $ 6,937
% of Total Investments at Fair Value 0.07% 0.07%
Life Insurance    
Schedule of Investments [Line Items]    
Fair Value $ 5,872 $ 5,884
% of Total Investments at Fair Value 0.06% 0.06%
Leisure Goods    
Schedule of Investments [Line Items]    
Fair Value $ 1,997 $ 1,991
% of Total Investments at Fair Value 0.02% 0.02%
Electronic and Electrical Equipment    
Schedule of Investments [Line Items]    
Fair Value $ 1,016 $ 1,015
% of Total Investments at Fair Value 0.01% 0.01%