v3.26.1
Fair Value - Summary of Changes in Fair Value of Level 3 Assets and Liabilities (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Opening balance $ 2,065,093 $ 1,955,645 $ 2,076,418 $ 1,956,286
Net realized gain (loss) (119) 355 (133) 377
Net change in unrealized gain (loss) $ (8,544) $ 2,370 $ (8,962) $ 1,207
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Net Change In Unrealized Gain Loss On Investments Net Change In Unrealized Gain Loss On Investments Net Change In Unrealized Gain Loss On Investments Net Change In Unrealized Gain Loss On Investments
Purchase of investment securities $ 205,540 [1] $ 336,951 [2] $ 332,012 [1] $ 533,739 [2]
Proceeds from dispositions of investment securities (209,904) (209,155) (347,269) (405,443)
Transfers in/out of Level 3 0 0 0 0
Closing balance 2,052,066 2,086,166 2,052,066 2,086,166
Net change in unrealized gain (loss) $ (7,643) $ 2,608 $ (7,889) $ 4,036
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Net Change In Unrealized Gain Loss On Investments Net Change In Unrealized Gain Loss On Investments Net Change In Unrealized Gain Loss On Investments Net Change In Unrealized Gain Loss On Investments
Senior Secured Loans [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Opening balance $ 1,239,329 $ 1,116,605 $ 1,260,389 $ 1,117,118
Net realized gain (loss) 7 365 (7) 395
Net change in unrealized gain (loss) (11,783) 1,382 (18,373) (1,523)
Purchase of investment securities 204,306 [1] 330,936 [2] 315,260 [1] 519,136 [2]
Proceeds from dispositions of investment securities (194,305) (180,384) (319,715) (366,222)
Transfers in/out of Level 3 0 0 0 0
Closing balance 1,237,554 1,268,904 1,237,554 1,268,904
Net change in unrealized gain (loss) (10,962) 1,620 (17,490) 1,306
Equipment Financing [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Opening balance 111,569 166,799 119,021 181,016
Net realized gain (loss) (20) (10) (20) (18)
Net change in unrealized gain (loss) 2,050 (3,846) 3,066 (10,339)
Purchase of investment securities 0 [1] 4,816 [2] 3,487 [1] 7,550 [2]
Proceeds from dispositions of investment securities (15,599) (28,771) (27,554) (39,221)
Transfers in/out of Level 3 0 0 0 0
Closing balance 98,000 138,988 98,000 138,988
Net change in unrealized gain (loss) 2,000 (3,846) 3,000 (10,339)
Preferred Equity [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Opening balance 33,576 32,339 32,858 31,682
Net realized gain (loss) 0 0 0 0
Net change in unrealized gain (loss) (130) (615) (256) (728)
Purchase of investment securities 863 [1] 786 [2] 1,707 [1] 1,556 [2]
Proceeds from dispositions of investment securities 0 0 0 0
Transfers in/out of Level 3 0 0 0 0
Closing balance 34,309 32,510 34,309 32,510
Net change in unrealized gain (loss) 0 (615) 0 (728)
Common Equity/Equity Interests/Warrants [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Opening balance 680,619 639,902 664,150 626,470
Net realized gain (loss) (106) 0 (106) 0
Net change in unrealized gain (loss) 1,319 5,449 6,601 13,797
Purchase of investment securities 371 [1] 413 [2] 11,558 [1] 5,497 [2]
Proceeds from dispositions of investment securities 0 0 0 0
Transfers in/out of Level 3 0 0 0 0
Closing balance 682,203 645,764 682,203 645,764
Net change in unrealized gain (loss) $ 1,319 $ 5,449 $ 6,601 $ 13,797
[1] Includes PIK capitalization and accretion of discount.
[2] Includes PIK capitalization and accretion of discount