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INVESTMENTS - Composition of The Company's Investment Portfolio (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]
Percentage of Investments at Fair Value 100.00% 100.00%
NH Keystone [Member]    
Schedule of Investments [Line Items]    
Cost $ 249,905  
Investment, Unaffiliated Issuer [Member]    
Schedule of Investments [Line Items]    
Cost 6,591,112 $ 6,103,560
Fair Value $ 6,504,378 $ 6,079,019
Percentage of Investments at Fair Value 100.00% 100.00% [7]
Investment, Unaffiliated Issuer [Member] | NH Keystone [Member]    
Schedule of Investments [Line Items]    
Cost [8],[9] $ 249,905  
Fair Value [8],[9] 249,685  
First Lien Debt [Member] | Investment, Unaffiliated Issuer [Member]    
Schedule of Investments [Line Items]    
Cost 6,506,675 $ 6,022,749
Fair Value $ 6,424,695 $ 5,997,696
Percentage of Investments at Fair Value 97.10% 98.60%
Second Lien Debt [Member] | Investment, Unaffiliated Issuer [Member]    
Schedule of Investments [Line Items]    
Cost $ 31,045 $ 16,613
Fair Value $ 32,023 $ 16,771
Percentage of Investments at Fair Value 0.50% 0.30%
Other Debt Investments [Member] | Investment, Unaffiliated Issuer [Member]    
Schedule of Investments [Line Items]    
Cost $ 12,010 $ 6,453
Fair Value $ 11,564 $ 6,520
Percentage of Investments at Fair Value 0.20% 0.10%
Equity [Member] | Investment, Unaffiliated Issuer [Member]    
Schedule of Investments [Line Items]    
Cost [10] $ 64,305 $ 57,745
Fair Value [10] $ 57,052 $ 58,032
Percentage of Investments at Fair Value [10] 0.90% 1.00%
Investment Fund [Member] | Investment, Unaffiliated Issuer [Member] | NH Keystone [Member]    
Schedule of Investments [Line Items]    
Cost [11] $ 85,438 $ 0
Fair Value [11] $ 85,276 $ 0
Percentage of Investments at Fair Value [11] 1.30% 0.00%
[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.
[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.
[8]

Variable rate loans to the portfolio companies bear interest at a rate that is determined by reference to either CORRA ("C") or EURIBOR ("E") or SOFR ("S") or SONIA ("SA")or an alternate base rate (commonly based on the Federal Funds Rate ("F") or the U.S. Prime Rate ("P")), which generally resets periodically.

[9] Loan includes interest rate floor of 1.00%
[10] Excludes equity investments in NH Keystone.
[11] Includes equity investments in NH Keystone.