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Investments - Investment Portfolio at Cost and Fair Value (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Schedule of Investments [Line Items]    
Cost $ 10,496,753 $ 9,934,159
Fair Value $ 10,439,173 $ 9,868,440
Investment Owned, At Fair Value | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
% of Total Investments at Fair Value 100.00% 100.00%
First lien debt    
Schedule of Investments [Line Items]    
Cost $ 10,375,810 [1],[2] $ 9,817,402 [3],[4]
Fair Value $ 10,287,119 [2] $ 9,722,061 [4]
First lien debt | Investment Owned, At Fair Value | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
% of Total Investments at Fair Value 98.50% 98.50%
Second lien debt    
Schedule of Investments [Line Items]    
Cost $ 43,551 [1],[2] $ 43,347 [4]
Fair Value $ 41,515 [2] $ 41,515 [4]
Second lien debt | Investment Owned, At Fair Value | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
% of Total Investments at Fair Value 0.40% 0.40%
Unsecured debt    
Schedule of Investments [Line Items]    
Cost $ 11,724 $ 9,930
Fair Value $ 11,859 $ 9,924
Unsecured debt | Investment Owned, At Fair Value | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
% of Total Investments at Fair Value 0.10% 0.10%
Investments in equity    
Schedule of Investments [Line Items]    
Cost $ 65,668 [1],[2],[5],[6],[7] $ 63,480 [3],[4]
Fair Value $ 98,680 [2],[5],[6],[7] $ 94,940 [4]
Investments in equity | Investment Owned, At Fair Value | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
% of Total Investments at Fair Value 1.00% 1.00%
[1] The cost represents the original cost adjusted for the amortization of discounts and premiums, as applicable, on debt investments using the effective interest method in accordance with accounting principles generally accepted in the United States of America (“GAAP”).
[2] Unless otherwise indicated, all debt and equity investments held by the Company (which such term “Company” shall include the Company’s consolidated subsidiaries for purposes of this Consolidated Schedule of Investments) are denominated in dollars. As of March 31, 2024, the Company had investments denominated in Canadian Dollars (CAD), Euros (EUR), British Pounds (GBP), Danish Krone (DKK), Swedish Krona (SEK), Norwegian Krone (NOK), and Australian Dollars (AUD). All debt investments are income producing unless otherwise indicated. All equity investments are non-income producing unless otherwise noted. Certain portfolio company investments are subject to contractual restrictions on sales. The total par amount (in thousands) is presented for debt investments, while the number of shares or units (in whole amounts) owned is presented for equity investments. Each of the Company’s investments is pledged as collateral, under one or more of its credit facilities unless otherwise indicated.
[3] The cost represents the original cost adjusted for the amortization of discounts and premiums, as applicable, on debt investments using the effective interest method in accordance with accounting principles generally accepted in the United States of America (“GAAP”).
[4] Unless otherwise indicated, all debt and equity investments held by the Company (which such term “Company” shall include the Company’s consolidated subsidiaries for purposes of this Consolidated Schedule of Investments) are denominated in dollars. As of December 31, 2023, the Company had investments denominated in Canadian Dollars (CAD), Euros (EUR), British Pounds (GBP), Danish Krone (DKK), Swedish Krona (SEK), and Norwegian Krone (NOK). All debt investments are income producing unless otherwise indicated. All equity investments are non-income producing unless otherwise noted. Certain portfolio company investments are subject to contractual restrictions on sales. The total par amount (in thousands) is presented for debt investments, while the number of shares or units (in whole amounts) owned is presented for equity investments. Each of the Company’s investments is pledged as collateral, under one or more of its credit facilities unless otherwise indicated.
[5] Under the 1940 Act, the Company would be deemed to “control” a portfolio company if the Company owned more than 25% of its outstanding voting securities and/or held the power to exercise control over the management or policies of the portfolio company. As of March 31, 2024, the Company does not “control” any of these portfolio companies. Under the 1940 Act, the Company would be deemed an “affiliated person” of a portfolio company if the Company owns 5% or more of the portfolio company’s outstanding voting securities. As of March 31, 2024, the Company’s non-controlled/affiliated investments were as follows:
Fair Value as of December 31, 2023
Gross AdditionsGross Reductions
Net Change in Unrealized Gains (Losses)
Net Realized Gain (Loss)
Fair Value as of March 31, 2024
Dividend and Interest Income
Non-controlled/Affiliated Investments
Blackstone Donegal Holdings LP$5,790 $— $— $312 $— $6,102 $— 
Total$5,790 $ $ $312 $ $6,102 $ 
[6] The investment is not a qualifying asset under Section 55(a) of the Investment Company Act of 1940, as amended (together with the rules and regulations promulgated thereunder, the “1940 Act”). The Company may not acquire any non-qualifying asset unless, at the time of acquisition, qualifying assets represent at least 70% of the Company’s total assets. As of March 31, 2024, non-qualifying assets represented 11.2% of total assets as calculated in accordance with regulatory requirements.
[7] 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 Board of Trustees (see Note 2), pursuant to the Company’s valuation policy.