Quarterly report pursuant to Section 13 or 15(d)

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

v3.23.1
Investments - Industry Composition of Investments at Fair Value (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Investment Holdings [Line Items]    
Fair Value $ 6,653,479 $ 5,716,521
% of Total Investments at Fair Value 100.00% 100.00%
Software and Computer Services    
Investment Holdings [Line Items]    
Fair Value $ 1,288,321 $ 1,158,262
% of Total Investments at Fair Value 19.36% 20.26%
Health Care Providers    
Investment Holdings [Line Items]    
Fair Value $ 779,681 $ 660,631
% of Total Investments at Fair Value 11.72% 11.56%
Industrial Support Services    
Investment Holdings [Line Items]    
Fair Value $ 746,764 $ 567,804
% of Total Investments at Fair Value 11.22% 9.93%
Media    
Investment Holdings [Line Items]    
Fair Value $ 566,703 $ 505,035
% of Total Investments at Fair Value 8.52% 8.83%
Consumer Services    
Investment Holdings [Line Items]    
Fair Value $ 458,931 $ 458,248
% of Total Investments at Fair Value 6.90% 8.02%
Non-life Insurance    
Investment Holdings [Line Items]    
Fair Value $ 375,824 $ 317,816
% of Total Investments at Fair Value 5.65% 5.56%
Medical Equipment and Services    
Investment Holdings [Line Items]    
Fair Value $ 327,070 $ 210,831
% of Total Investments at Fair Value 4.92% 3.69%
Travel and Leisure    
Investment Holdings [Line Items]    
Fair Value $ 297,999 $ 159,763
% of Total Investments at Fair Value 4.48% 2.79%
General Industrials    
Investment Holdings [Line Items]    
Fair Value $ 272,688 $ 265,463
% of Total Investments at Fair Value 4.10% 4.64%
Pharmaceuticals and Biotechnology    
Investment Holdings [Line Items]    
Fair Value $ 267,703 $ 196,435
% of Total Investments at Fair Value 4.02% 3.44%
Industrial Engineering    
Investment Holdings [Line Items]    
Fair Value $ 214,840 $ 186,373
% of Total Investments at Fair Value 3.23% 3.26%
Aerospace and Defense    
Investment Holdings [Line Items]    
Fair Value $ 208,585 $ 169,856
% of Total Investments at Fair Value 3.13% 2.97%
Personal Care, Drug and Grocery Stores    
Investment Holdings [Line Items]    
Fair Value $ 108,830 $ 117,320
% of Total Investments at Fair Value 1.64% 2.05%
Automobiles and Parts    
Investment Holdings [Line Items]    
Fair Value $ 107,268 $ 118,440
% of Total Investments at Fair Value 1.60% 2.07%
Technology Hardware and Equipment    
Investment Holdings [Line Items]    
Fair Value $ 95,877 $ 93,161
% of Total Investments at Fair Value 1.44% 1.63%
Food Producers    
Investment Holdings [Line Items]    
Fair Value $ 88,938 $ 86,977
% of Total Investments at Fair Value 1.34% 1.52%
Personal Goods    
Investment Holdings [Line Items]    
Fair Value $ 72,511 $ 70,050
% of Total Investments at Fair Value 1.09% 1.23%
Telecommunications Service Providers    
Investment Holdings [Line Items]    
Fair Value $ 62,336 $ 71,695
% of Total Investments at Fair Value 0.94% 1.25%
Industrial Transportation    
Investment Holdings [Line Items]    
Fair Value $ 51,205 $ 50,090
% of Total Investments at Fair Value 0.77% 0.88%
Finance and Credit Services    
Investment Holdings [Line Items]    
Fair Value $ 49,000 $ 48,448
% of Total Investments at Fair Value 0.74% 0.85%
Real Estate Investment and Services    
Investment Holdings [Line Items]    
Fair Value $ 44,253 $ 44,822
% of Total Investments at Fair Value 0.67% 0.78%
Gas, Water and Multi-utilities    
Investment Holdings [Line Items]    
Fair Value $ 43,990 $ 43,242
% of Total Investments at Fair Value 0.66% 0.76%
Structured Finance    
Investment Holdings [Line Items]    
Fair Value $ 28,824 $ 28,737
% of Total Investments at Fair Value 0.43% 0.50%
Retailers    
Investment Holdings [Line Items]    
Fair Value $ 18,033 $ 20,322
% of Total Investments at Fair Value 0.27% 0.36%
Household Goods and Home Construction    
Investment Holdings [Line Items]    
Fair Value $ 16,482 $ 17,918
% of Total Investments at Fair Value 0.25% 0.31%
Telecommunications Equipment    
Investment Holdings [Line Items]    
Fair Value $ 14,351 $ 6,445
% of Total Investments at Fair Value 0.22% 0.11%
Electricity    
Investment Holdings [Line Items]    
Fair Value $ 12,582 $ 8,639
% of Total Investments at Fair Value 0.18% 0.15%
Chemicals    
Investment Holdings [Line Items]    
Fair Value $ 12,029 $ 6,960
% of Total Investments at Fair Value 0.18% 0.12%
Investment Banking and Brokerage Services    
Investment Holdings [Line Items]    
Fair Value $ 9,229 $ 7,606
% of Total Investments at Fair Value 0.14% 0.13%
Life Insurance    
Investment Holdings [Line Items]    
Fair Value $ 5,718 $ 5,628
% of Total Investments at Fair Value 0.09% 0.10%
Industrial Metals and Mining    
Investment Holdings [Line Items]    
Fair Value $ 2,941 $ 2,922
% of Total Investments at Fair Value 0.04% 0.05%
Leisure Goods    
Investment Holdings [Line Items]    
Fair Value $ 1,990 $ 8,498
% of Total Investments at Fair Value 0.03% 0.15%
Construction and Materials    
Investment Holdings [Line Items]    
Fair Value $ 1,073 $ 1,162
% of Total Investments at Fair Value 0.02% 0.03%
Electronic and Electrical Equipment    
Investment Holdings [Line Items]    
Fair Value $ 910 $ 922
% of Total Investments at Fair Value 0.01% 0.02%