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INVESTMENTS - Geographic Composition of Investments at Cost and Fair Value (Details) - USD ($)
$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Schedule of Investments [Line Items]    
Cost $ 6,699,473 [1],[2],[3] $ 6,103,560 [4],[5],[6]
Fair Value $ 6,610,610 [2],[3] $ 6,079,019 [5],[6]
% of Total Investments at Fair Value 100.00% 100.00%
% of Total Net Assets at Fair Value 195.60% 185.80%
Investment, Unaffiliated Issuer [Member]    
Schedule of Investments [Line Items]    
Cost $ 6,591,112 $ 6,103,560
Fair Value $ 6,504,378 $ 6,079,019
% of Total Investments at Fair Value 100.00% 100.00% [7]
Australia | Investment, Unaffiliated Issuer [Member]    
Schedule of Investments [Line Items]    
Cost $ 64,182 $ 35,737
Fair Value $ 64,920 $ 36,465
% of Total Investments at Fair Value 1.00% 0.60%
% of Total Net Assets at Fair Value 1.90% 1.10%
Canada | Investment, Unaffiliated Issuer [Member]    
Schedule of Investments [Line Items]    
Cost $ 124,530 $ 118,951
Fair Value $ 125,168 $ 119,346
% of Total Investments at Fair Value 1.90% 2.00%
% of Total Net Assets at Fair Value 3.70% 3.60%
United Kingdom | Investment, Unaffiliated Issuer [Member]    
Schedule of Investments [Line Items]    
Cost $ 49,100 $ 46,293
Fair Value $ 49,673 $ 45,550
% of Total Investments at Fair Value 0.80% 0.70%
% of Total Net Assets at Fair Value 1.50% 1.40%
United States | Investment, Unaffiliated Issuer [Member]    
Schedule of Investments [Line Items]    
Cost $ 6,461,661 $ 5,902,579
Fair Value $ 6,370,849 $ 5,877,658
% of Total Investments at Fair Value 96.30% 96.70%
% of Total Net Assets at Fair Value 188.50% 179.70%
[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.
[2] Unless otherwise indicated, issuers of 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. All debt investments are income producing unless otherwise indicated. All equity investments (including preferred equity investments) are non-income producing unless otherwise noted. Certain portfolio company investments are subject to contractual restrictions on sales. 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 December 31, 2025, the Company would be deemed to “control” one of its portfolio companies, as indicated below. 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 December 31, 2025, the Company is an “affiliated person” of two of its portfolio companies, as indicated below.
[3] Unless otherwise indicated, the Company's investments are pledged as collateral supporting the amounts outstanding under the ING Facility as defined below. See Note 6 “Debt”.
[4] The cost represents the original cost adjusted for the amortization of discounts and premiums, as applicable, on debt investments using the effective interest method.
[5] Unless otherwise indicated, issuers of 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. All debt investments are income producing unless otherwise indicated. All equity investments (including preferred equity investments) are non-income producing unless otherwise noted. Certain portfolio company investments are subject to contractual restrictions on sales. Under the Investment Company Act of 1940, as amended (together with the rules and regulations promulgated thereunder, 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 December 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 December 31, 2024, the Company is not an “affiliated person” of any of its portfolio companies.
[6] Unless otherwise indicated, the Company's investments are pledged as collateral supporting the amounts outstanding under the ING Facility (as defined below). See Note 6 "Debt".
[7] The Company reclassified certain industry groupings of its portfolio companies presented in the consolidated financial statements as of December 31, 2025 to align with the recently updated GICS, where applicable. These reclassifications had no impact on the prior period’s Consolidated Statement of Financial Condition.