Fair Value of Financial Instruments - Changes in Fair Value of Investments Using Level 3 Inputs (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] |
|
|
|
|
| Balance, beginning of period |
$ 3,177,854
|
$ 3,371,230
|
$ 3,181,834
|
$ 3,485,041
|
| Purchases or originations |
185,031
|
254,814
|
347,800
|
429,405
|
| Repayments / redemptions |
(192,103)
|
(379,689)
|
(308,249)
|
(667,579)
|
| Sales Proceeds |
|
(43,551)
|
10
|
(45,108)
|
| Paid-in-kind interest |
4,430
|
5,622
|
11,106
|
10,857
|
| Net change in unrealized gains (losses) |
$ (2,989)
|
$ 61,015
|
$ (21,633)
|
$ (50,223)
|
| Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] |
Unrealized Gain (Loss), Investment, Derivative, and Foreign Currency Transaction, Operating, after Tax
|
Unrealized Gain (Loss), Investment, Derivative, and Foreign Currency Transaction, Operating, after Tax
|
Unrealized Gain (Loss), Investment, Derivative, and Foreign Currency Transaction, Operating, after Tax
|
Unrealized Gain (Loss), Investment, Derivative, and Foreign Currency Transaction, Operating, after Tax
|
| Net realized gains (losses) |
$ 5
|
$ (38,228)
|
$ (42,734)
|
$ (37,830)
|
| Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] |
Realized Gain (Loss), Investment, Derivative, and Foreign Currency Transaction, Operating, after Tax
|
Realized Gain (Loss), Investment, Derivative, and Foreign Currency Transaction, Operating, after Tax
|
Realized Gain (Loss), Investment, Derivative, and Foreign Currency Transaction, Operating, after Tax
|
Realized Gain (Loss), Investment, Derivative, and Foreign Currency Transaction, Operating, after Tax
|
| Net amortization of discount on securities |
$ 3,488
|
$ 7,917
|
$ 7,864
|
$ 14,121
|
| Transfers into (out of) Level 3 |
|
(22,018)
|
(282)
|
(22,018)
|
| Balance, End of Period |
3,175,716
|
3,217,112
|
3,175,716
|
3,217,112
|
| First-lien Debt Investments |
|
|
|
|
| Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] |
|
|
|
|
| Balance, beginning of period |
2,942,965
|
3,144,798
|
2,956,297
|
3,287,829
|
| Purchases or originations |
148,279
|
252,448
|
296,374
|
396,218
|
| Repayments / redemptions |
(183,108)
|
(376,332)
|
(299,254)
|
(664,222)
|
| Sales Proceeds |
|
(36,910)
|
10
|
(36,910)
|
| Paid-in-kind interest |
1,610
|
3,453
|
5,482
|
6,745
|
| Net change in unrealized gains (losses) |
(11,371)
|
68,075
|
(64,760)
|
(59,751)
|
| Net realized gains (losses) |
5
|
(41,507)
|
10
|
(41,483)
|
| Net amortization of discount on securities |
3,252
|
7,579
|
7,473
|
13,676
|
| Transfers within Level 3 |
|
(7,533)
|
|
(7,533)
|
| Balance, End of Period |
2,901,632
|
3,014,071
|
2,901,632
|
3,014,071
|
| Second-lien Debt Investments |
|
|
|
|
| Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] |
|
|
|
|
| Balance, beginning of period |
31,073
|
32,301
|
30,456
|
18,535
|
| Purchases or originations |
|
|
|
15,359
|
| Repayments / redemptions |
(8,245)
|
(3,357)
|
(8,245)
|
(3,357)
|
| Paid-in-kind interest |
1,173
|
1,026
|
2,309
|
1,831
|
| Net change in unrealized gains (losses) |
(528)
|
(1,540)
|
38,321
|
(4,026)
|
| Net realized gains (losses) |
|
|
(39,489)
|
|
| Net amortization of discount on securities |
202
|
305
|
323
|
393
|
| Balance, End of Period |
23,675
|
28,735
|
23,675
|
28,735
|
| Mezzanine Debt Investments |
|
|
|
|
| Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] |
|
|
|
|
| Balance, beginning of period |
63,752
|
52,179
|
61,684
|
39,091
|
| Purchases or originations |
|
|
|
12,740
|
| Repayments / redemptions |
(750)
|
|
(750)
|
|
| Paid-in-kind interest |
1,647
|
1,143
|
3,315
|
2,200
|
| Net change in unrealized gains (losses) |
(63)
|
212
|
303
|
(516)
|
| Net amortization of discount on securities |
34
|
33
|
68
|
52
|
| Balance, End of Period |
64,620
|
53,567
|
64,620
|
53,567
|
| Equity and Structured Credit Investments |
|
|
|
|
| Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] |
|
|
|
|
| Balance, beginning of period |
125,399
|
|
133,397
|
|
| Purchases or originations |
26
|
|
35
|
|
| Net change in unrealized gains (losses) |
6,532
|
|
2,062
|
|
| Net realized gains (losses) |
|
|
(3,255)
|
|
| Transfers into (out of) Level 3 |
|
|
(282)
|
|
| Balance, End of Period |
131,957
|
|
131,957
|
|
| Equity Investments |
|
|
|
|
| Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] |
|
|
|
|
| Balance, beginning of period |
|
141,952
|
|
139,586
|
| Purchases or originations |
|
2,366
|
|
5,088
|
| Sales Proceeds |
|
(6,641)
|
|
(8,198)
|
| Paid-in-kind interest |
|
|
|
81
|
| Net change in unrealized gains (losses) |
|
(5,732)
|
|
4,986
|
| Net realized gains (losses) |
|
3,279
|
|
3,653
|
| Transfers within Level 3 |
|
7,533
|
|
7,533
|
| Transfers into (out of) Level 3 |
|
(22,018)
|
|
(22,018)
|
| Balance, End of Period |
|
$ 120,739
|
|
$ 120,739
|
| Joint Venture Investments |
|
|
|
|
| Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] |
|
|
|
|
| Balance, beginning of period |
14,665
|
|
|
|
| Purchases or originations |
36,726
|
|
51,391
|
|
| Net change in unrealized gains (losses) |
2,441
|
|
2,441
|
|
| Balance, End of Period |
$ 53,832
|
|
$ 53,832
|
|