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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
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Investments    
Amortized cost $ 2,523,064 [1] $ 1,465,352 [2]
Total investments $ 2,528,167 [1],[3] $ 1,468,996 [2],[4]
Concentration risk, percentage 100.00% 100.00%
Aerospace & Defense    
Investments    
Amortized cost $ 24,306 $ 21,418
Total investments $ 23,871 $ 21,049
Aerospace & Defense | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 1.00% 1.50%
Aerospace & Defense | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 0.90% 1.40%
Automotive    
Investments    
Amortized cost $ 55,374 $ 39,131
Total investments $ 52,433 $ 38,843
Automotive | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 2.20% 2.70%
Automotive | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 2.10% 2.70%
Banking    
Investments    
Amortized cost $ 32,289 $ 35,534
Total investments $ 31,338 $ 37,979
Banking | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 1.30% 2.40%
Banking | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 1.20% 2.60%
Beverage, Food & Tobacco    
Investments    
Amortized cost $ 43,443 $ 16,807
Total investments $ 43,420 $ 16,439
Beverage, Food & Tobacco | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 1.70% 1.10%
Beverage, Food & Tobacco | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 1.70% 1.10%
Capital Equipment    
Investments    
Amortized cost $ 153,516 $ 55,062
Total investments $ 153,448 $ 56,074
Capital Equipment | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 6.10% 3.70%
Capital Equipment | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 6.10% 3.80%
Chemicals, Plastics & Rubber    
Investments    
Amortized cost $ 738 $ 0
Total investments $ 555 $ 0
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 $ 97,869 $ 34,932
Total investments $ 99,032 $ 34,877
Construction & Building | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 3.90% 2.40%
Construction & Building | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 3.90% 2.40%
Consumer Goods: Durable    
Investments    
Amortized cost $ 45,961 $ 42,278
Total investments $ 43,879 $ 40,357
Consumer Goods: Durable | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 1.80% 2.90%
Consumer Goods: Durable | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 1.70% 2.70%
Consumer Goods: Non-Durable    
Investments    
Amortized cost $ 49,303 $ 32,697
Total investments $ 47,767 $ 32,843
Consumer Goods: Non-Durable | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 2.00% 2.20%
Consumer Goods: Non-Durable | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 1.90% 2.20%
Containers, Packaging & Glass    
Investments    
Amortized cost $ 13,857 $ 11,674
Total investments $ 13,978 $ 11,675
Containers, Packaging & Glass | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 0.50% 0.80%
Containers, Packaging & Glass | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 0.60% 0.80%
Energy: Oil & Gas    
Investments    
Amortized cost $ 20,128 $ 3,970
Total investments $ 19,939 $ 3,597
Energy: Oil & Gas | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 0.80% 0.30%
Energy: Oil & Gas | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 0.80% 0.20%
Environmental Industries    
Investments    
Amortized cost $ 35,805 $ 30,612
Total investments $ 36,964 $ 31,457
Environmental Industries | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 1.40% 2.10%
Environmental Industries | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 1.50% 2.10%
FIRE: Finance    
Investments    
Amortized cost $ 185,745 $ 67,608
Total investments $ 188,094 $ 66,639
FIRE: Finance | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 7.40% 4.60%
FIRE: Finance | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 7.40% 4.50%
FIRE: Insurance    
Investments    
Amortized cost $ 23,848 $ 9,709
Total investments $ 23,624 $ 9,641
FIRE: Insurance | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 0.90% 0.70%
FIRE: Insurance | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 0.90% 0.70%
FIRE: Real Estate    
Investments    
Amortized cost $ 81,184 $ 69,695
Total investments $ 82,981 $ 71,154
FIRE: Real Estate | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 3.20% 4.70%
FIRE: Real Estate | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 3.30% 4.80%
Healthcare & Pharmaceuticals    
Investments    
Total investments $ 354,470 $ 210,831
Healthcare & Pharmaceuticals | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 14.00% 14.40%
High Tech Industries    
Investments    
Amortized cost $ 211,563 $ 180,078
Total investments $ 208,931 $ 180,823
High Tech Industries | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 8.40% 12.30%
High Tech Industries | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 8.30% 12.30%
Hotels, Gaming & Leisure    
Investments    
Amortized cost $ 95 $ 2,316
Total investments $ 95 $ 2,331
Hotels, Gaming & Leisure | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 0.00% 0.10%
Hotels, Gaming & Leisure | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 0.00% 0.20%
Media: Advertising, Printing & Publishing    
Investments    
Amortized cost $ 145,910 $ 128,704
Total investments $ 148,571 $ 129,362
Media: Advertising, Printing & Publishing | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 5.80% 8.80%
Media: Advertising, Printing & Publishing | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 5.90% 8.80%
Media: Broadcasting & Subscription    
Investments    
Amortized cost $ 3,160 $ 2,059
Total investments $ 1,663 $ 2,019
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 0.10% 0.10%
Media: Diversified & Production    
Investments    
Amortized cost $ 93,581 $ 46,881
Total investments $ 93,116 $ 46,348
Media: Diversified & Production | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 3.70% 3.20%
Media: Diversified & Production | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 3.70% 3.20%
Services: Business    
Investments    
Amortized cost $ 428,134 $ 184,567
Total investments $ 434,280 $ 184,535
Services: Business | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 17.00% 12.60%
Services: Business | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 17.20% 12.60%
Services: Consumer    
Investments    
Amortized cost $ 166,396 $ 77,065
Total investments $ 167,734 $ 77,998
Services: Consumer | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 6.60% 5.30%
Services: Consumer | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 6.60% 5.30%
Telecommunications    
Investments    
Amortized cost $ 73,705 $ 36,508
Total investments $ 74,679 $ 36,415
Telecommunications | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 2.90% 2.50%
Telecommunications | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 3.00% 2.50%
Transportation: Cargo    
Investments    
Amortized cost $ 107,107 $ 97,803
Total investments $ 107,424 $ 97,153
Transportation: Cargo | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 4.20% 6.70%
Transportation: Cargo | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 4.20% 6.60%
Utilities: Electric    
Investments    
Amortized cost $ 40,045 $ 0
Total investments $ 40,039 $ 0
Utilities: Electric | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 1.60% 0.00%
Utilities: Electric | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 1.60% 0.00%
Wholesale    
Investments    
Amortized cost $ 35,375 $ 28,784
Total investments $ 35,842 $ 28,557
Wholesale | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 1.40% 2.00%
Wholesale | Investment Owned, At Fair Value | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 1.40% 2.00%
Healthcare & Pharmaceuticals    
Investments    
Amortized cost $ 354,627 $ 209,460
Healthcare & Pharmaceuticals | Investment Owned, At Cost | Investment Portfolio By Industry Concentration Risk    
Investments    
Concentration risk, percentage 14.10% 14.30%
[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.)