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INVESTMENTS - Composition of Investments at Fair Value (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Schedule of Investments [Line Items]    
Cost $ 3,323,767 $ 3,226,776
Fair Value $ 3,293,205 $ 3,193,561
Investment Owned at Fair Value | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
% of Total Investments at Fair Value 100.00% 100.00%
Australia    
Schedule of Investments [Line Items]    
Cost $ 16,978 $ 16,985
Fair Value $ 17,115 $ 17,048
Australia | Investment Owned at Fair Value | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
% of Total Investments at Fair Value 0.50% 0.50%
Canada    
Schedule of Investments [Line Items]    
Cost $ 96,252 $ 98,674
Fair Value $ 96,693 $ 98,387
Canada | Investment Owned at Fair Value | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
% of Total Investments at Fair Value 2.90% 3.10%
United Kingdom    
Schedule of Investments [Line Items]    
Cost $ 11,499 $ 12,398
Fair Value $ 11,721 $ 12,629
United Kingdom | Investment Owned at Fair Value | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
% of Total Investments at Fair Value 0.40% 0.40%
United States    
Schedule of Investments [Line Items]    
Cost $ 3,199,038 $ 3,098,719
Fair Value $ 3,167,676 $ 3,065,497
United States | Investment Owned at Fair Value | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
% of Total Investments at Fair Value 96.20% 96.00%
Aerospace & Defense | Investment Owned at Fair Value | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
% of Total Investments at Fair Value 2.30% 2.20%
Air Freight & Logistics | Investment Owned at Fair Value | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
% of Total Investments at Fair Value 0.50% 1.10%
Automobile Components | Investment Owned at Fair Value | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
% of Total Investments at Fair Value 3.40% 3.50%
Automobiles | Investment Owned at Fair Value | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
% of Total Investments at Fair Value 4.80% 4.70%
Biotechnology | Investment Owned at Fair Value | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
% of Total Investments at Fair Value 0.50% 0.50%
Chemicals | Investment Owned at Fair Value | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
% of Total Investments at Fair Value 0.60% 0.60%
Commercial Services & Supplies | Investment Owned at Fair Value | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
% of Total Investments at Fair Value 9.30% 9.60%
Construction & Engineering | Investment Owned at Fair Value | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
% of Total Investments at Fair Value 1.80% 1.50%
Consumer Staples Distribution & Retail | Investment Owned at Fair Value | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
% of Total Investments at Fair Value 0.60% 0.00%
Containers & Packaging | Investment Owned at Fair Value | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
% of Total Investments at Fair Value 1.40% 1.40%
Distributors | Investment Owned at Fair Value | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
% of Total Investments at Fair Value 2.80% 2.90%
Diversified Consumer Services | Investment Owned at Fair Value | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
% of Total Investments at Fair Value 3.40% 2.50%
Electronic Equipment, Instruments & Components | Investment Owned at Fair Value | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
% of Total Investments at Fair Value 2.00% 2.10%
Energy Equipment & Services | Investment Owned at Fair Value | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
% of Total Investments at Fair Value 0.40% 0.50%
Financial Services | Investment Owned at Fair Value | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
% of Total Investments at Fair Value 1.80% 1.90%
Food Products | Investment Owned at Fair Value | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
% of Total Investments at Fair Value 2.30% 2.30%
Health Care Equipment & Supplies | Investment Owned at Fair Value | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
% of Total Investments at Fair Value 0.60% 0.70%
Health Care Providers & Services | Investment Owned at Fair Value | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
% of Total Investments at Fair Value 4.10% 4.60%
Health Care Technology | Investment Owned at Fair Value | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
% of Total Investments at Fair Value 1.80% 1.90%
Industrial Conglomerates | Investment Owned at Fair Value | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
% of Total Investments at Fair Value 1.40% 1.30%
Insurance Services | Investment Owned at Fair Value | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
% of Total Investments at Fair Value 15.10% 14.90%
Interactive Media & Services | Investment Owned at Fair Value | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
% of Total Investments at Fair Value 3.00% 3.20%
IT Services | Investment Owned at Fair Value | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
% of Total Investments at Fair Value 8.60% 8.70%
Leisure Products | Investment Owned at Fair Value | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
% of Total Investments at Fair Value 0.70% 0.70%
Machinery | Investment Owned at Fair Value | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
% of Total Investments at Fair Value 2.00% 2.10%
Multi-Utilities | Investment Owned at Fair Value | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
% of Total Investments at Fair Value 0.60% 0.70%
Pharmaceuticals | Investment Owned at Fair Value | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
% of Total Investments at Fair Value 0.40% 0.40%
Professional Services | Investment Owned at Fair Value | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
% of Total Investments at Fair Value 3.70% 3.80%
Real Estate Management & Development | Investment Owned at Fair Value | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
% of Total Investments at Fair Value 5.10% 5.30%
Software | Investment Owned at Fair Value | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
% of Total Investments at Fair Value 14.80% 14.20%
Wireless Telecommunication Services | Investment Owned at Fair Value | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
% of Total Investments at Fair Value 0.20% 0.20%
First Lien Debt    
Schedule of Investments [Line Items]    
Cost $ 3,131,129 $ 3,027,413
Fair Value $ 3,115,404 $ 3,004,544
First Lien Debt | Investment Owned at Fair Value | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
% of Total Investments at Fair Value 94.60% 94.10%
First Lien Debt | Aerospace & Defense    
Schedule of Investments [Line Items]    
Cost $ 73,453 $ 69,354
Fair Value 73,533 69,364
First Lien Debt | Air Freight & Logistics    
Schedule of Investments [Line Items]    
Cost 15,791 30,213
Fair Value 15,952 29,744
First Lien Debt | Automobile Components    
Schedule of Investments [Line Items]    
Cost 86,895 86,754
Fair Value 86,331 86,173
First Lien Debt | Automobiles    
Schedule of Investments [Line Items]    
Cost 159,390 151,741
Fair Value 157,160 150,980
First Lien Debt | Biotechnology    
Schedule of Investments [Line Items]    
Cost 16,423 15,580
Fair Value 16,500 15,619
First Lien Debt | Chemicals    
Schedule of Investments [Line Items]    
Cost 21,114 20,940
Fair Value 20,856 20,481
First Lien Debt | Commercial Services & Supplies    
Schedule of Investments [Line Items]    
Cost 299,804 306,475
Fair Value 301,624 304,534
First Lien Debt | Construction & Engineering    
Schedule of Investments [Line Items]    
Cost 59,834 47,178
Fair Value 59,778 46,877
First Lien Debt | Containers & Packaging    
Schedule of Investments [Line Items]    
Cost 43,508 43,466
Fair Value 43,370 43,688
First Lien Debt | Distributors    
Schedule of Investments [Line Items]    
Cost 97,317 98,033
Fair Value 92,234 93,930
First Lien Debt | Diversified Consumer Services    
Schedule of Investments [Line Items]    
Cost 114,621 81,164
Fair Value 113,744 80,159
First Lien Debt | Electronic Equipment, Instruments & Components    
Schedule of Investments [Line Items]    
Cost 45,585 45,611
Fair Value 44,166 44,711
First Lien Debt | Financial Services    
Schedule of Investments [Line Items]    
Cost 60,265 59,701 [1],[2]
Fair Value 60,757 59,992 [1],[2]
First Lien Debt | Food Products    
Schedule of Investments [Line Items]    
Cost 74,213 73,733
Fair Value 73,427 72,784
First Lien Debt | Health Care Equipment & Supplies    
Schedule of Investments [Line Items]    
Cost 20,890 22,434
Fair Value 21,134 22,614
First Lien Debt | Health Care Providers & Services    
Schedule of Investments [Line Items]    
Cost 123,673 139,406
Fair Value 123,661 138,138
First Lien Debt | Health Care Technology    
Schedule of Investments [Line Items]    
Cost 60,458 61,205
Fair Value 60,914 61,443
First Lien Debt | Industrial Conglomerates    
Schedule of Investments [Line Items]    
Cost 44,252 33,707
Fair Value 45,142 34,595
First Lien Debt | Insurance Services    
Schedule of Investments [Line Items]    
Cost 490,012 472,289
Fair Value 490,131 471,507
First Lien Debt | Interactive Media & Services    
Schedule of Investments [Line Items]    
Cost 104,027 104,479
Fair Value 99,816 100,782
First Lien Debt | IT Services    
Schedule of Investments [Line Items]    
Cost 231,513 230,636
Fair Value 227,993 224,725
First Lien Debt | Leisure Products    
Schedule of Investments [Line Items]    
Cost 21,510 21,552
Fair Value 21,533 21,453
First Lien Debt | Machinery    
Schedule of Investments [Line Items]    
Cost 67,084 68,230
Fair Value 66,996 66,966
First Lien Debt | Multi-Utilities    
Schedule of Investments [Line Items]    
Cost 20,672 20,654
Fair Value 20,967 20,828
First Lien Debt | Pharmaceuticals    
Schedule of Investments [Line Items]    
Cost 11,499 12,398
Fair Value 11,721 12,629
First Lien Debt | Professional Services    
Schedule of Investments [Line Items]    
Cost 118,493 116,655
Fair Value 119,477 118,043
First Lien Debt | Real Estate Management & Development    
Schedule of Investments [Line Items]    
Cost 165,005 168,456
Fair Value 164,451 168,090
First Lien Debt | Software    
Schedule of Investments [Line Items]    
Cost 458,156 419,529
Fair Value 456,335 417,855
First Lien Debt | Wireless Telecommunication Services    
Schedule of Investments [Line Items]    
Cost 5,829 5,840
Fair Value 5,858 5,840
Second Lien Debt    
Schedule of Investments [Line Items]    
Cost 136,708 146,014
Fair Value $ 118,107 $ 132,415
Second Lien Debt | Investment Owned at Fair Value | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
% of Total Investments at Fair Value 3.60% 4.10%
Second Lien Debt | Commercial Services & Supplies    
Schedule of Investments [Line Items]    
Cost $ 836  
Fair Value 837  
Second Lien Debt | Health Care Providers & Services    
Schedule of Investments [Line Items]    
Cost 5,423 $ 5,419
Fair Value 5,405 5,387
Second Lien Debt | IT Services    
Schedule of Investments [Line Items]    
Cost 40,113 40,092
Fair Value 37,347 36,979
Second Lien Debt | Software    
Schedule of Investments [Line Items]    
Cost 23,815 23,808
Fair Value 13,500 19,233
Other Investments    
Schedule of Investments [Line Items]    
Cost 55,930 53,349
Fair Value $ 59,694 $ 56,602
Other Investments | Investment Owned at Fair Value | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
% of Total Investments at Fair Value 1.80% 1.80%
[1]
Loan includes interest rate floor of 1.00%.
[2] These investments were valued using unobservable inputs and are considered Level 3 investments. Fair value was determined in good faith by or under the direction of the Company’s Valuation Designee, under the supervision of the Board of Directors (the “Board of Directors” or the “Board”) (see Note 2 and Note 5), pursuant to the Company’s valuation policy.