v3.25.2
Fair Value - Summary of Changes in Fair Value of Level 3 Assets and Liabilities (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2025
Jun. 30, 2025
Dec. 31, 2024
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Opening balance $ 1,955,645 $ 1,956,286 $ 2,110,586
Net realized gain (loss) 355 377 (2,068)
Net change in unrealized gain (loss) $ 2,370 $ 1,207 $ 1,531
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
Purchase of investment securities $ 336,951 [1] $ 533,739 [1] $ 479,716 [2]
Proceeds from dispositions of investment securities (209,155) (405,443) (633,479)
Transfers in/out of Level 3 0 0 0
Closing balance 2,086,166 2,086,166 1,956,286
Net change in unrealized gain (loss) $ 2,608 $ 4,036 $ 5,687
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
Senior Secured Loans [Member]      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Opening balance $ 1,116,605 $ 1,117,118 $ 1,277,539
Net realized gain (loss) 365 395 (1,400)
Net change in unrealized gain (loss) 1,382 (1,523) (3,598)
Purchase of investment securities 330,936 [1] 519,136 [1] 411,598 [2]
Proceeds from dispositions of investment securities (180,384) (366,222) (567,021)
Transfers in/out of Level 3 0 0 0
Closing balance 1,268,904 1,268,904 1,117,118
Net change in unrealized gain (loss) 1,620 1,306 1,533
Equipment Financing [Member]      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Opening balance 166,799 181,016 256,819
Net realized gain (loss) (10) (18) 0
Net change in unrealized gain (loss) (3,846) (10,339) (12,646)
Purchase of investment securities 4,816 [1] 7,550 [1] 2,852 [2]
Proceeds from dispositions of investment securities (28,771) (39,221) (66,009)
Transfers in/out of Level 3 0 0 0
Closing balance 138,988 138,988 181,016
Net change in unrealized gain (loss) (3,846) (10,339) (12,646)
Preferred Equity [Member]      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Opening balance 32,339 31,682 3,801
Net realized gain (loss) 0 0 0
Net change in unrealized gain (loss) (615) (728) 49
Purchase of investment securities 786 [1] 1,556 [1] 27,832 [2]
Proceeds from dispositions of investment securities 0 0 0
Transfers in/out of Level 3 0 0 0
Closing balance 32,510 32,510 31,682
Net change in unrealized gain (loss) (615) (728) 49
Common Equity/Equity Interests/Warrants [Member]      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Opening balance 639,902 626,470 572,427
Net realized gain (loss) 0 0 (668)
Net change in unrealized gain (loss) 5,449 13,797 17,726
Purchase of investment securities 413 [1] 5,497 [1] 37,434 [2]
Proceeds from dispositions of investment securities 0 0 (449)
Transfers in/out of Level 3 0 0 0
Closing balance 645,764 645,764 626,470
Net change in unrealized gain (loss) $ 5,449 $ 13,797 $ 16,751
[1] Includes PIK capitalization and accretion of discount.
[2] Includes PIK capitalization and accretion of discount