v3.26.1
Joint Venture - Statement of Operations Information (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Investment income:    
Total investment income $ 606,798 $ 444,134
Expenses:    
Interest expense 188,784 137,906
Total expenses 292,204 209,153
Net realized and change in unrealized gain (loss) on investments    
Net realized gain (loss) on investments (226,180) 7,754
Net change in unrealized appreciation (depreciation) on investments 10,902 (56,060)
Net realized and change in unrealized gain (loss) (215,278) (48,306)
Net increase (decrease) in net assets resulting from operations 97,314 186,382
Nonconsolidated Investee or group of investees | ULTRA III    
Investment income:    
Interest income 35,583 27,628
Total investment income 35,583 27,628
Expenses:    
Interest expense 17,014 13,636
Other expenses 840 655
Total expenses 17,854 14,291
Net investment income 17,729 13,337
Net realized and change in unrealized gain (loss) on investments    
Net realized gain (loss) on investments 0 0
Net change in unrealized appreciation (depreciation) on investments (10,944) 1,423
Net realized and change in unrealized gain (loss) (10,944) 1,423
Net increase (decrease) in net assets resulting from operations $ 6,785 $ 14,760