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Investments - 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
 9 Months Ended 12 Months Ended
Sep. 30, 2024
Dec. 31, 2023
Investments    
Amortized cost [1] $ 3,641,702 $ 2,523,064
Fair value [1] $ 3,662,029 [2] $ 2,528,167 [3]
Concentration risk, percentage 100.00% 100.00%
Aerospace & Defense    
Investments    
Amortized cost $ 24,126 $ 24,306
Fair value $ 23,845 $ 23,871
Aerospace & Defense | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 0.70% 1.00%
Aerospace & Defense | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 0.70% 0.90%
Automotive    
Investments    
Amortized cost $ 73,449 $ 55,374
Fair value $ 64,446 $ 52,433
Automotive | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 2.00% 2.20%
Automotive | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 1.80% 2.10%
Banking    
Investments    
Amortized cost $ 62,871 $ 32,289
Fair value $ 58,775 $ 31,338
Banking | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 1.70% 1.30%
Banking | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 1.60% 1.20%
Beverage, Food & Tobacco    
Investments    
Amortized cost $ 26,829 $ 43,443
Fair value $ 26,830 $ 43,420
Beverage, Food & Tobacco | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 0.70% 1.70%
Beverage, Food & Tobacco | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 0.70% 1.70%
Capital Equipment    
Investments    
Amortized cost $ 187,230 $ 153,516
Fair value $ 185,880 $ 153,448
Capital Equipment | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 5.10% 6.10%
Capital Equipment | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 5.10% 6.10%
Chemicals, Plastics & Rubber    
Investments    
Amortized cost $ 1,047 $ 738
Fair value $ 974 $ 555
Chemicals, Plastics & Rubber | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 0.00% 0.00%
Chemicals, Plastics & Rubber | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 0.00% 0.00%
Construction & Building    
Investments    
Amortized cost $ 161,033 $ 97,869
Fair value $ 165,069 $ 99,032
Construction & Building | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 4.40% 3.90%
Construction & Building | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 4.50% 3.90%
Consumer Goods: Durable    
Investments    
Amortized cost $ 40,211 $ 45,961
Fair value $ 37,436 $ 43,879
Consumer Goods: Durable | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 1.10% 1.80%
Consumer Goods: Durable | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 1.00% 1.70%
Consumer Goods: Non-Durable    
Investments    
Amortized cost $ 59,700 $ 49,303
Fair value $ 58,459 $ 47,767
Consumer Goods: Non-Durable | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 1.60% 2.00%
Consumer Goods: Non-Durable | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 1.60% 1.90%
Containers, Packaging & Glass    
Investments    
Amortized cost $ 13,813 $ 13,857
Fair value $ 13,582 $ 13,978
Containers, Packaging & Glass | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 0.40% 0.50%
Containers, Packaging & Glass | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 0.40% 0.60%
Energy: Oil & Gas    
Investments    
Amortized cost $ 133 $ 20,128
Fair value $ 126 $ 19,939
Energy: Oil & Gas | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 0.00% 0.80%
Energy: Oil & Gas | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 0.00% 0.80%
Environmental Industries    
Investments    
Amortized cost $ 56,348 $ 35,805
Fair value $ 57,684 $ 36,964
Environmental Industries | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 1.60% 1.40%
Environmental Industries | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 1.60% 1.50%
FIRE: Finance    
Investments    
Amortized cost $ 231,348 $ 185,745
Fair value $ 235,187 $ 188,094
FIRE: Finance | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 6.40% 7.40%
FIRE: Finance | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 6.50% 7.40%
FIRE: Insurance    
Investments    
Amortized cost $ 25,558 $ 23,848
Fair value $ 25,588 $ 23,624
FIRE: Insurance | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 0.70% 0.90%
FIRE: Insurance | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 0.70% 0.90%
FIRE: Real Estate    
Investments    
Amortized cost $ 75,848 $ 81,184
Fair value $ 78,110 $ 82,981
FIRE: Real Estate | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 2.10% 3.20%
FIRE: Real Estate | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 2.10% 3.30%
Healthcare & Pharmaceuticals    
Investments    
Amortized cost $ 543,753 $ 354,627
Fair value $ 550,246 $ 354,470
Healthcare & Pharmaceuticals | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 14.90% 14.10%
Healthcare & Pharmaceuticals | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 15.00% 14.00%
High Tech Industries    
Investments    
Amortized cost $ 469,562 $ 211,563
Fair value $ 465,850 $ 208,931
High Tech Industries | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 12.90% 8.40%
High Tech Industries | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 12.70% 8.30%
Hotels, Gaming & Leisure    
Investments    
Amortized cost $ 95 $ 95
Fair value $ 107 $ 95
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 $ 196,237 $ 145,910
Fair value $ 199,155 $ 148,571
Media: Advertising, Printing & Publishing | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 5.40% 5.80%
Media: Advertising, Printing & Publishing | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 5.50% 5.90%
Media: Broadcasting & Subscription    
Investments    
Amortized cost $ 3,430 $ 3,160
Fair value $ 1,120 $ 1,663
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% 0.10%
Media: Diversified & Production    
Investments    
Amortized cost $ 111,600 $ 93,581
Fair value $ 110,794 $ 93,116
Media: Diversified & Production | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 3.10% 3.70%
Media: Diversified & Production | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 3.00% 3.70%
Services: Business    
Investments    
Amortized cost $ 744,373 $ 428,134
Fair value $ 758,892 $ 434,280
Services: Business | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 20.40% 17.00%
Services: Business | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 20.70% 17.20%
Services: Consumer    
Investments    
Amortized cost $ 209,097 $ 166,396
Fair value $ 210,100 $ 167,734
Services: Consumer | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 5.70% 6.60%
Services: Consumer | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 5.70% 6.60%
Telecommunications    
Investments    
Amortized cost $ 85,901 $ 73,705
Fair value $ 85,450 $ 74,679
Telecommunications | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 2.40% 2.90%
Telecommunications | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 2.30% 3.00%
Transportation: Cargo    
Investments    
Amortized cost $ 149,359 $ 107,107
Fair value $ 148,847 $ 107,424
Transportation: Cargo | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 4.10% 4.20%
Transportation: Cargo | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 4.10% 4.20%
Utilities: Electric    
Investments    
Amortized cost $ 52,834 $ 40,045
Fair value $ 62,986 $ 40,039
Utilities: Electric | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 1.50% 1.60%
Utilities: Electric | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 1.70% 1.60%
Wholesale    
Investments    
Amortized cost $ 35,917 $ 35,375
Fair value $ 36,491 $ 35,842
Wholesale | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 1.00% 1.40%
Wholesale | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 1.00% 1.40%
[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] 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).
[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.)