v3.26.1
Investments - Investments By Industry (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2026
Dec. 31, 2025
Consolidated Schedule of Investments    
Investments, amortized cost $ 2,375,245 $ 2,502,667
Percentage of Total Portfolio 100.00% 100.00%
Investments at fair value $ 2,363,576 $ 2,508,441
Percentage of Total Portfolio 100.00% 100.00%
Investment Holding    
Consolidated Schedule of Investments    
Investments, amortized cost $ 2,375,245 $ 2,502,667
Percentage of Total Portfolio 100.00% 100.00%
Investments at fair value $ 2,363,576 $ 2,508,441
Percentage of Total Portfolio 100.00% 100.00%
Investment Vehicles | Investment Holding    
Consolidated Schedule of Investments    
Investments, amortized cost $ 435,928 [1] $ 426,942 [2]
Percentage of Total Portfolio 18.30% [1] 17.10% [2]
Investments at fair value $ 387,104 [1] $ 399,051 [2]
Percentage of Total Portfolio 16.50% [1] 15.90% [2]
Services: Business | Investment Holding    
Consolidated Schedule of Investments    
Investments, amortized cost $ 225,209 $ 228,836
Percentage of Total Portfolio 9.40% 9.10%
Investments at fair value $ 247,588 $ 253,954
Percentage of Total Portfolio 10.50% 10.10%
High Tech Industries | Investment Holding    
Consolidated Schedule of Investments    
Investments, amortized cost $ 203,568 $ 250,660
Percentage of Total Portfolio 8.60% 10.00%
Investments at fair value $ 212,346 $ 271,004
Percentage of Total Portfolio 9.00% 10.80%
Healthcare & Pharmaceuticals | Investment Holding    
Consolidated Schedule of Investments    
Investments, amortized cost $ 196,704 $ 213,870
Percentage of Total Portfolio 8.30% 8.50%
Investments at fair value $ 190,996 $ 210,063
Percentage of Total Portfolio 8.10% 8.40%
Aerospace and Defense | Investment Holding    
Consolidated Schedule of Investments    
Investments, amortized cost $ 169,996 $ 237,633
Percentage of Total Portfolio 7.20% 9.50%
Investments at fair value $ 179,716 $ 235,307
Percentage of Total Portfolio 7.60% 9.40%
Beverage, Food & Tobacco | Investment Holding    
Consolidated Schedule of Investments    
Investments, amortized cost $ 142,717 $ 116,454
Percentage of Total Portfolio 6.00% 4.70%
Investments at fair value $ 140,416 $ 115,105
Percentage of Total Portfolio 5.90% 4.60%
FIRE: Finance | Investment Holding    
Consolidated Schedule of Investments    
Investments, amortized cost $ 98,986 [3] $ 101,357 [4]
Percentage of Total Portfolio 4.20% [3] 4.00% [4]
Investments at fair value $ 119,019 [3] $ 114,894 [4]
Percentage of Total Portfolio 5.00% [3] 4.60% [4]
Environmental Industries | Investment Holding    
Consolidated Schedule of Investments    
Investments, amortized cost $ 112,055 $ 85,843
Percentage of Total Portfolio 4.70% 3.40%
Investments at fair value $ 112,785 $ 87,491
Percentage of Total Portfolio 4.80% 3.50%
Transportation: Cargo | Investment Holding    
Consolidated Schedule of Investments    
Investments, amortized cost $ 101,954 $ 96,830
Percentage of Total Portfolio 4.30% 3.90%
Investments at fair value $ 111,647 $ 108,504
Percentage of Total Portfolio 4.70% 4.30%
Automotive | Investment Holding    
Consolidated Schedule of Investments    
Investments, amortized cost $ 103,250 $ 111,100
Percentage of Total Portfolio 4.30% 4.40%
Investments at fair value $ 96,801 $ 105,969
Percentage of Total Portfolio 4.10% 4.20%
Consumer Goods: Non-Durable | Investment Holding    
Consolidated Schedule of Investments    
Investments, amortized cost $ 79,158 $ 70,788
Percentage of Total Portfolio 3.30% 2.80%
Investments at fair value $ 75,794 $ 67,550
Percentage of Total Portfolio 3.20% 2.70%
Services: Consumer | Investment Holding    
Consolidated Schedule of Investments    
Investments, amortized cost $ 65,646 $ 64,981
Percentage of Total Portfolio 2.80% 2.60%
Investments at fair value $ 60,918 $ 62,729
Percentage of Total Portfolio 2.60% 2.50%
Capital Equipment | Investment Holding    
Consolidated Schedule of Investments    
Investments, amortized cost $ 61,896 $ 49,524
Percentage of Total Portfolio 2.60% 2.00%
Investments at fair value $ 74,396 $ 56,654
Percentage of Total Portfolio 3.10% 2.30%
Telecommunications | Investment Holding    
Consolidated Schedule of Investments    
Investments, amortized cost $ 56,315 $ 54,768
Percentage of Total Portfolio 2.40% 2.20%
Investments at fair value $ 56,050 $ 54,019
Percentage of Total Portfolio 2.40% 2.20%
Construction & Building | Investment Holding    
Consolidated Schedule of Investments    
Investments, amortized cost $ 56,971 $ 76,871
Percentage of Total Portfolio 2.40% 3.10%
Investments at fair value $ 49,396 $ 77,815
Percentage of Total Portfolio 2.10% 3.10%
Chemicals, Plastics & Rubber | Investment Holding    
Consolidated Schedule of Investments    
Investments, amortized cost $ 49,075 $ 48,895
Percentage of Total Portfolio 2.10% 2.00%
Investments at fair value $ 47,656 $ 47,767
Percentage of Total Portfolio 2.00% 1.90%
Consumer Goods: Durable | Investment Holding    
Consolidated Schedule of Investments    
Investments, amortized cost $ 46,751 $ 53,098
Percentage of Total Portfolio 2.00% 2.10%
Investments at fair value $ 45,057 $ 51,259
Percentage of Total Portfolio 1.90% 2.00%
Hotel, Gaming & Leisure | Investment Holding    
Consolidated Schedule of Investments    
Investments, amortized cost $ 32,563 $ 24,284
Percentage of Total Portfolio 1.40% 1.00%
Investments at fair value $ 32,876 $ 24,708
Percentage of Total Portfolio 1.40% 1.00%
Transportation: Consumer | Investment Holding    
Consolidated Schedule of Investments    
Investments, amortized cost $ 31,483 $ 25,839
Percentage of Total Portfolio 1.30% 1.00%
Investments at fair value $ 31,767 $ 26,118
Percentage of Total Portfolio 1.30% 1.00%
Wholesale | Investment Holding    
Consolidated Schedule of Investments    
Investments, amortized cost $ 37,592 $ 29,346
Percentage of Total Portfolio 1.60% 1.20%
Investments at fair value $ 31,483 $ 24,546
Percentage of Total Portfolio 1.30% 1.00%
Media: Diversified & Production | Investment Holding    
Consolidated Schedule of Investments    
Investments, amortized cost $ 27,953 $ 34,714
Percentage of Total Portfolio 1.20% 1.40%
Investments at fair value $ 28,348 $ 29,461
Percentage of Total Portfolio 1.20% 1.20%
Utilities: Electric | Investment Holding    
Consolidated Schedule of Investments    
Investments, amortized cost $ 7,995 $ 8,023
Percentage of Total Portfolio 0.30% 0.30%
Investments at fair value $ 7,927 $ 8,020
Percentage of Total Portfolio 0.30% 0.30%
Containers, Packaging & Glass | Investment Holding    
Consolidated Schedule of Investments    
Investments, amortized cost $ 5,389 $ 9,079
Percentage of Total Portfolio 0.20% 0.40%
Investments at fair value $ 5,439 $ 9,182
Percentage of Total Portfolio 0.20% 0.40%
FIRE: Insurance | Investment Holding    
Consolidated Schedule of Investments    
Investments, amortized cost $ 4,729 [3] $ 30,653 [4]
Percentage of Total Portfolio 0.20% [3] 1.20% [4]
Investments at fair value $ 4,625 [3] $ 30,829 [4]
Percentage of Total Portfolio 0.20% [3] 1.20% [4]
Media: Advertising, Printing & Publishing | Investment Holding    
Consolidated Schedule of Investments    
Investments, amortized cost $ 4,680 $ 3,090
Percentage of Total Portfolio 0.20% 0.10%
Investments at fair value $ 4,213 $ 2,857
Percentage of Total Portfolio 0.20% 0.10%
Retail | Investment Holding    
Consolidated Schedule of Investments    
Investments, amortized cost $ 11,803 $ 26,314
Percentage of Total Portfolio 0.50% 1.10%
Investments at fair value $ 4,148 $ 17,613
Percentage of Total Portfolio 0.20% 0.70%
Media: Broadcasting & Subscription | Investment Holding    
Consolidated Schedule of Investments    
Investments, amortized cost $ 2,881 $ 2,876
Percentage of Total Portfolio 0.10% 0.10%
Investments at fair value $ 2,916 $ 2,954
Percentage of Total Portfolio 0.10% 0.10%
Metals & Mining | Investment Holding    
Consolidated Schedule of Investments    
Investments, amortized cost $ 1,227 $ 9,184
Percentage of Total Portfolio 0.10% 0.40%
Investments at fair value $ 1,291 $ 9,158
Percentage of Total Portfolio 0.10% 0.40%
FIRE: Real Estate | Investment Holding    
Consolidated Schedule of Investments    
Investments, amortized cost [3] $ 779  
Percentage of Total Portfolio [3] 0.00%  
Investments at fair value [3] $ 858  
Percentage of Total Portfolio [3] 0.00%  
Utilities: Water | Investment Holding    
Consolidated Schedule of Investments    
Investments, amortized cost $ (8) $ 2,731
Percentage of Total Portfolio 0.00% 0.10%
Investments at fair value $ 0 $ 2,757
Percentage of Total Portfolio 0.00% 0.10%
Consumer Goods: Wholesale | Investment Holding    
Consolidated Schedule of Investments    
Investments, amortized cost   $ 8,084
Percentage of Total Portfolio   0.30%
Investments at fair value   $ 1,103
Percentage of Total Portfolio   0.00%
[1] Represents debt and equity investment in ISLP and SLP (each as defined later).
[2] Represents debt and equity investment in ISLP and SLP (each as defined later).
[3] Finance, Insurance, and Real Estate (“FIRE”).
[4] Finance, Insurance, and Real Estate (“FIRE”).