v3.26.1
Investments - Schedule of Investments at Fair Value and Amortized Cost (Details) - USD ($)
$ in Thousands
Mar. 31, 2026
Dec. 31, 2025
Schedule of Investments [Line Items]    
Amortized Cost $ 15,400,230 [1],[2],[3],[4] $ 16,417,779 [5],[6],[7],[8]
Fair Value 15,344,201 [1],[3] 16,470,893 [5],[8]
First-lien senior secured debt investments    
Schedule of Investments [Line Items]    
Amortized Cost 11,255,827 12,215,994
Fair Value 11,035,403 12,048,934
Second-lien senior secured debt investments    
Schedule of Investments [Line Items]    
Amortized Cost 962,550 975,790
Fair Value 773,357 848,575
Unsecured debt investments    
Schedule of Investments [Line Items]    
Amortized Cost 359,188 384,569
Fair Value 369,374 399,962
Specialty finance debt investments    
Schedule of Investments [Line Items]    
Amortized Cost 159,315 157,004
Fair Value 159,598 157,297
Preferred equity investments    
Schedule of Investments [Line Items]    
Amortized Cost 547,459 592,714
Fair Value 536,853 568,977
Common equity investments    
Schedule of Investments [Line Items]    
Amortized Cost 460,319 473,881
Fair Value 665,746 644,304
Specialty finance equity investments    
Schedule of Investments [Line Items]    
Amortized Cost 1,227,623 1,195,614
Fair Value 1,414,987 1,386,739
Joint ventures    
Schedule of Investments [Line Items]    
Amortized Cost 427,949 422,213
Fair Value $ 388,883 $ 416,105
[1] Certain portfolio company investments are subject to contractual restrictions on sales. Refer to footnote 30 for additional information on the Company’s restricted securities.
[2] The amortized cost represents the original cost adjusted for the amortization or accretion of premium or discount, as applicable, on debt investments using the effective interest method.
[3] Unless otherwise indicated, the Company’s portfolio companies are pledged as collateral supporting the amounts outstanding under the Revolving Credit Facility, SPV Asset Facilities and CLOs. See “Note 5Debt.”
[4] As of March 31, 2026, the net estimated unrealized loss for U.S. federal income tax purposes was $113.1 million based on a tax cost basis of $15.46 billion. As of March 31, 2026, the estimated aggregate gross unrealized loss for U.S. federal income tax purposes was $563.3 million and the estimated aggregate gross unrealized gain for U.S. federal income tax purposes was $450.2 million
[5] Certain portfolio company investments are subject to contractual restrictions on sales. Refer to footnote 30 for additional information on the Company’s restricted securities.
[6] The amortized cost represents the original cost adjusted for the amortization or accretion of premium or discount, as applicable, on debt investments using the effective interest method.
[7] As of December 31, 2025, the net estimated unrealized loss for U.S. federal income tax purposes was $26.6 million based on a tax cost basis of $16.60 billion. As of December 31, 2025, the estimated aggregate gross unrealized loss for U.S. federal income tax purposes was $572.2 million and the estimated aggregate gross unrealized gain for U.S. federal income tax purposes was $545.6 million.
[8] Unless otherwise indicated, the Company’s portfolio companies are pledged as collateral supporting the amounts outstanding under the Revolving Credit Facility, SPV Asset Facilities and CLOs. See “Note 5Debt.”