v3.26.1
Fair Value of Investments - Schedule of Quantitative Information About Significant Unobservable Inputs of Level 3 Investments (Details)
$ in Thousands
Mar. 31, 2026
USD ($)
Dec. 31, 2025
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value $ 5,217,369 [1],[2] $ 6,207,136 [3],[4]
First-lien senior secured debt investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 4,557,893 5,484,795
Second-lien senior secured debt investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 201,125 267,441
Unsecured debt investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 62,454 66,531
Preferred equity investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 171,367 173,230
Common equity investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 100,585 101,617
Specialty finance equity investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 108,651 89,389
Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 4,578,924 5,295,125
Level 3 | First-lien senior secured debt investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 4,142,341 4,802,901
Level 3 | First-lien senior secured debt investments | Yield Analysis | Market Yield    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value $ 4,121,888 $ 4,114,791
Level 3 | First-lien senior secured debt investments | Yield Analysis | Minimum | Market Yield    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Measurement input (as a percent) 0.070 0.060
Level 3 | First-lien senior secured debt investments | Yield Analysis | Maximum | Market Yield    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Measurement input (as a percent) 0.373 0.236
Level 3 | First-lien senior secured debt investments | Yield Analysis | Weighted Average | Market Yield    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Measurement input (as a percent) 0.099 0.090
Level 3 | First-lien senior secured debt investments | Collateral Analysis | Recovery Rate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value $ 11,682 $ 15,517
Level 3 | First-lien senior secured debt investments | Collateral Analysis | Weighted Average | Recovery Rate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Measurement input (as a percent) 0.570 0.775
Level 3 | First-lien senior secured debt investments | Recent Transaction | Transaction Price    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value $ 8,771 $ 672,593
Level 3 | First-lien senior secured debt investments | Recent Transaction | Minimum | Transaction Price    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Measurement input (as a percent) 0.972 0.950
Level 3 | First-lien senior secured debt investments | Recent Transaction | Maximum | Transaction Price    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Measurement input (as a percent) 0.995 0.998
Level 3 | First-lien senior secured debt investments | Recent Transaction | Weighted Average | Transaction Price    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Measurement input (as a percent) 0.995 0.994
Level 3 | Second-lien senior secured debt investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value $ 117,845 $ 161,254
Level 3 | Second-lien senior secured debt investments | Yield Analysis | Market Yield    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value $ 117,845 $ 161,254
Level 3 | Second-lien senior secured debt investments | Yield Analysis | Minimum | Market Yield    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Measurement input (as a percent) 0.110 0.084
Level 3 | Second-lien senior secured debt investments | Yield Analysis | Maximum | Market Yield    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Measurement input (as a percent) 0.191 0.325
Level 3 | Second-lien senior secured debt investments | Yield Analysis | Weighted Average | Market Yield    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Measurement input (as a percent) 0.141 0.174
Level 3 | Unsecured debt investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value $ 62,454 $ 66,531
Level 3 | Unsecured debt investments | Yield Analysis | Market Yield    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value $ 59,488 $ 63,400
Level 3 | Unsecured debt investments | Yield Analysis | Minimum | Market Yield    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Measurement input (as a percent) 0.113 0.108
Level 3 | Unsecured debt investments | Yield Analysis | Maximum | Market Yield    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Measurement input (as a percent) 0.144 0.142
Level 3 | Unsecured debt investments | Yield Analysis | Weighted Average | Market Yield    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Measurement input (as a percent) 0.127 0.124
Level 3 | Unsecured debt investments | Quote | Quote    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value $ 2,966 $ 3,131
Level 3 | Unsecured debt investments | Quote | Weighted Average | Quote    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Measurement input (as a percent) 0.989 1.044
Level 3 | Preferred equity investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value $ 171,367 $ 173,230
Level 3 | Preferred equity investments | Yield Analysis | Market Yield    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value $ 126,330 $ 127,154
Level 3 | Preferred equity investments | Yield Analysis | Minimum | Market Yield    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Measurement input (as a percent) 0.128 0.116
Level 3 | Preferred equity investments | Yield Analysis | Maximum | Market Yield    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Measurement input (as a percent) 0.276 0.225
Level 3 | Preferred equity investments | Yield Analysis | Weighted Average | Market Yield    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Measurement input (as a percent) 0.180 0.136
Level 3 | Preferred equity investments | Recent Transaction | Transaction Price    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value $ 14,182 $ 22,950
Level 3 | Preferred equity investments | Recent Transaction | Minimum | Transaction Price    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Measurement input (as a percent) 1.000 0.628
Level 3 | Preferred equity investments | Recent Transaction | Maximum | Transaction Price    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Measurement input (as a percent) 2.899 1.000
Level 3 | Preferred equity investments | Recent Transaction | Weighted Average | Transaction Price    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Measurement input (as a percent) 1.895 0.850
Level 3 | Preferred equity investments | Market Approach | Revenue Multiple    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value $ 30,855 $ 17,550
Level 3 | Preferred equity investments | Market Approach | EBITDA Multiple    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value   $ 5,576
Level 3 | Preferred equity investments | Market Approach | Minimum | Revenue Multiple    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Measurement input (as a percent) 4.0 4.8
Level 3 | Preferred equity investments | Market Approach | Maximum | Revenue Multiple    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Measurement input (as a percent) 21.0 14.8
Level 3 | Preferred equity investments | Market Approach | Weighted Average | Revenue Multiple    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Measurement input (as a percent) 10.2 8.9
Level 3 | Preferred equity investments | Market Approach | Weighted Average | EBITDA Multiple    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Measurement input (as a percent)   1.289
Level 3 | Common equity investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value $ 82,255 $ 88,586
Level 3 | Common equity investments | Recent Transaction | Transaction Price    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value $ 16,369 $ 20,251
Level 3 | Common equity investments | Recent Transaction | Minimum | Transaction Price    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Measurement input (as a percent) 0.942 1.000
Level 3 | Common equity investments | Recent Transaction | Maximum | Transaction Price    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Measurement input (as a percent) 1.000 1.732
Level 3 | Common equity investments | Recent Transaction | Weighted Average | Transaction Price    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Measurement input (as a percent) 0.950 1.062
Level 3 | Common equity investments | Market Approach | Revenue Multiple    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value $ 26,167 $ 26,777
Level 3 | Common equity investments | Market Approach | EBITDA Multiple    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 35,433 37,806
Level 3 | Common equity investments | Market Approach | Market Adjustment Factor    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value $ 4,235 $ 3,712
Level 3 | Common equity investments | Market Approach | Minimum | Revenue Multiple    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Measurement input (as a percent) 3.9 5.3
Level 3 | Common equity investments | Market Approach | Minimum | EBITDA Multiple    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Measurement input (as a percent) 8.0 8.75
Level 3 | Common equity investments | Market Approach | Maximum | Revenue Multiple    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Measurement input (as a percent) 7.5 13.0
Level 3 | Common equity investments | Market Approach | Maximum | EBITDA Multiple    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Measurement input (as a percent) 21.5 25.50
Level 3 | Common equity investments | Market Approach | Weighted Average | Revenue Multiple    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Measurement input (as a percent) 7.2 9.9
Level 3 | Common equity investments | Market Approach | Weighted Average | EBITDA Multiple    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Measurement input (as a percent) 12.3 13.12
Level 3 | Common equity investments | Market Approach | Weighted Average | Market Adjustment Factor    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Measurement input (as a percent) (0.032) 0
Level 3 | Common equity investments | Option Pricing Model | Volatility    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value $ 51 $ 40
Level 3 | Common equity investments | Option Pricing Model | Weighted Average | Volatility    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Measurement input (as a percent) 0.700 0.70
Level 3 | Specialty finance equity investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value $ 2,662 $ 2,623
Level 3 | Specialty finance equity investments | Yield Analysis | Market Yield    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value $ 2,662 $ 2,623
Level 3 | Specialty finance equity investments | Yield Analysis | Weighted Average | Market Yield    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Measurement input (as a percent) 0.118 0.115
[1] Certain portfolio company investments are subject to contractual restrictions on sales. Refer to footnote 30 for additional information on our restricted securities.
[2] Unless otherwise indicated, the Company’s portfolio companies are pledged as collateral supporting the amounts outstanding under the Company’s Amended and Restated Senior Secured Revolving Credit Agreement (the “Revolving Credit Facility”) and credit facilities to which certain of the Company’s subsidiaries are parties (the “SPV Asset Facilities” and the “CLOs”). See “Note 5 — Debt.”
[3] Certain portfolio company investments are subject to contractual restrictions on sales. Refer to footnote 30 for additional information on our restricted securities.
[4] Unless otherwise indicated, the Company’s portfolio companies are pledged as collateral supporting the amounts outstanding under the Company’s Amended and Restated Senior Secured Revolving Credit Agreement (the “Revolving Credit Facility”) and credit facilities to which certain of the Company’s subsidiaries are parties (the “SPV Asset Facilities” and the “CLOs”). See “Note 5 — Debt.”