v3.25.4
Investments - Schedule of Composition of the Company's Investment Portfolio by Industry, at Amortized Cost and Fair Value (with Corresponding Percentage of Total Portfolio Investments) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Investments    
Amortized cost $ 5,913,363 [1] $ 4,002,785 [2]
Fair value $ 5,819,755 [1],[3] $ 4,008,973 [2],[4]
Concentration risk, percentage   100.00%
Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 100.00%  
Investment Owned, At Cost | Geographic Concentration Risk    
Investments    
Concentration risk, percentage 100.00% 100.00%
Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 100.00% 100.00%
Investment Owned, At Fair Value | Geographic Concentration Risk    
Investments    
Concentration risk, percentage 100.00% 100.00%
Interest rate 0.10%  
Aerospace & Defense    
Investments    
Amortized cost $ 41,610 $ 24,110
Fair value $ 40,434 $ 23,854
Aerospace & Defense | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 0.70% 0.60%
Aerospace & Defense | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 0.70% 0.60%
Automotive    
Investments    
Amortized cost $ 132,579 $ 76,264
Fair value $ 61,039 $ 66,253
Automotive | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 2.20% 1.90%
Automotive | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 1.00% 1.70%
Banking    
Investments    
Amortized cost $ 46,932 $ 48,045
Fair value $ 40,681 $ 43,672
Banking | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 0.80% 1.20%
Banking | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 0.70% 1.10%
Beverage, Food & Tobacco    
Investments    
Amortized cost $ 146,450 $ 27,123
Fair value $ 145,549 $ 27,414
Beverage, Food & Tobacco | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 2.50% 0.70%
Beverage, Food & Tobacco | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 2.50% 0.70%
Capital Equipment    
Investments    
Amortized cost $ 278,579 $ 191,064
Fair value $ 272,138 $ 187,727
Capital Equipment | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 4.70% 4.80%
Capital Equipment | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 4.70% 4.70%
Chemicals, Plastics & Rubber    
Investments    
Amortized cost $ 53,586 $ 0
Fair value $ 53,692 $ 0
Chemicals, Plastics & Rubber | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 0.90% 0.00%
Chemicals, Plastics & Rubber | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 0.90% 0.00%
Construction & Building    
Investments    
Amortized cost $ 275,448 $ 217,997
Fair value $ 282,687 $ 222,008
Construction & Building | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 4.70% 5.40%
Construction & Building | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 4.90% 5.50%
Consumer Goods: Durable    
Investments    
Amortized cost $ 87,104 $ 74,112
Fair value $ 54,861 $ 71,293
Consumer Goods: Durable | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 1.50% 1.80%
Consumer Goods: Durable | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 0.90% 1.80%
Consumer Goods: Non-Durable    
Investments    
Amortized cost $ 87,121 $ 51,050
Fair value $ 80,235 $ 48,784
Consumer Goods: Non-Durable | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 1.50% 1.30%
Consumer Goods: Non-Durable | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 1.40% 1.20%
Containers, Packaging & Glass    
Investments    
Amortized cost $ 57,824 $ 40,180
Fair value $ 57,516 $ 40,136
Containers, Packaging & Glass | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 1.00% 1.00%
Containers, Packaging & Glass | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 1.00% 1.00%
Energy: Oil & Gas    
Investments    
Amortized cost $ 132 $ 132
Fair value $ 133 $ 118
Energy: Oil & Gas | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 0.00% 0.00%
Energy: Oil & Gas | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 0.00% 0.00%
Environmental Industries    
Investments    
Amortized cost $ 101,103 $ 66,543
Fair value $ 100,594 $ 68,253
Environmental Industries | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 1.70% 1.70%
Environmental Industries | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 1.70% 1.70%
FIRE: Finance    
Investments    
Amortized cost $ 395,159 $ 234,481
Fair value $ 401,245 $ 233,307
FIRE: Finance | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 6.70% 5.90%
FIRE: Finance | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 6.90% 5.80%
FIRE: Real Estate    
Investments    
Amortized cost $ 170,649 $ 77,846
Fair value $ 173,367 $ 81,966
FIRE: Real Estate | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 2.90% 1.90%
FIRE: Real Estate | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 3.00% 2.10%
Healthcare & Pharmaceuticals    
Investments    
Amortized cost $ 831,390 $ 590,748
Fair value $ 822,082 $ 594,527
Healthcare & Pharmaceuticals | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 14.10% 14.70%
Healthcare & Pharmaceuticals | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 14.10% 14.80%
High Tech Industries    
Investments    
Amortized cost $ 765,255 $ 499,624
Fair value $ 768,219 $ 497,616
High Tech Industries | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 12.90% 12.50%
High Tech Industries | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 13.20% 12.40%
Hotels, Gaming & Leisure    
Investments    
Amortized cost $ 95 $ 95
Fair value $ 122 $ 123
Hotels, Gaming & Leisure | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 0.00% 0.00%
Hotels, Gaming & Leisure | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 0.00% 0.00%
Media: Advertising, Printing & Publishing    
Investments    
Amortized cost $ 327,320 $ 195,966
Fair value $ 324,332 $ 197,904
Media: Advertising, Printing & Publishing | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 5.40% 4.90%
Media: Advertising, Printing & Publishing | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 5.60% 4.90%
Media: Broadcasting & Subscription    
Investments    
Amortized cost $ 3,448 $ 3,430
Fair value $ 523 $ 867
Media: Broadcasting & Subscription | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 0.10% 0.10%
Media: Broadcasting & Subscription | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 0.00% 0.00%
Media: Diversified & Production    
Investments    
Amortized cost $ 92,892 $ 112,124
Fair value $ 88,577 $ 111,259
Media: Diversified & Production | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 1.50% 2.80%
Media: Diversified & Production | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 1.50% 2.80%
Retail    
Investments    
Amortized cost $ 14,448 $ 14,570
Fair value $ 14,624 $ 14,566
Retail | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 0.20% 0.40%
Retail | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 0.30% 0.40%
Services: Business    
Investments    
Amortized cost $ 1,276,711 $ 888,565
Fair value $ 1,299,308 $ 901,082
Services: Business | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 21.60% 22.20%
Services: Business | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 22.30% 22.50%
Services: Consumer    
Investments    
Amortized cost $ 341,755 $ 240,050
Fair value $ 338,841 $ 240,488
Services: Consumer | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 5.80% 6.00%
Services: Consumer | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 5.80% 6.00%
Telecommunications    
Investments    
Amortized cost $ 129,104 $ 103,312
Fair value $ 122,038 $ 101,469
Telecommunications | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 2.20% 2.60%
Telecommunications | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 2.10% 2.50%
Transportation: Cargo    
Investments    
Amortized cost $ 211,690 $ 173,308
Fair value $ 201,888 $ 172,550
Transportation: Cargo | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 3.60% 4.30%
Transportation: Cargo | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 3.50% 4.30%
Utilities: Electric    
Investments    
Amortized cost $ 4,504 $ 4,505
Fair value $ 36,030 $ 13,764
Utilities: Electric | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 0.10% 0.10%
Utilities: Electric | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 0.60% 0.30%
Wholesale    
Investments    
Amortized cost $ 40,475 $ 47,541
Fair value $ 39,000 $ 47,973
Wholesale | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 0.70% 1.20%
Wholesale | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 0.70% 1.20%
[1] All of the Company’s investments are issued by eligible portfolio companies, as defined in the Investment Company Act of 1940, as amended, (the “1940 Act”), unless otherwise noted. All of the Company’s investments are issued by U.S. portfolio companies unless otherwise noted.
[2] All of the Company’s investments are issued by eligible portfolio companies, as defined in the Investment Company Act of 1940, as amended, (the “1940 Act”), unless otherwise noted. All of the Company’s investments are issued by U.S. portfolio companies unless otherwise noted.
[3] Except as otherwise noted, because there is no readily available market value for these investments, the fair value of each of these investments is determined in good faith using significant unobservable inputs by the Valuation Designee. (See Note 4 in the accompanying notes to the consolidated financial statements).
[4] Except as otherwise noted, because there is no readily available market value for these investments, the fair value of each of these investments is determined in good faith using significant unobservable inputs by the Valuation Designee. (See Note 4 in the accompanying notes to the consolidated financial statements).