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Investments - Summary of Information Relating to Investments Measured at Fair Value for Company has Used Unobservable Inputs to Determine Fair Value (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |
Beginning balance |  | $ 357,528 |  | $ 471,170 |
Transfers out of Level III | [1] |  |  | (19,199) |
Transfers into Level III |  | 65,325 | [2] | 1,643 | [3]
Net accretion |  | 4,618 |  | 7,315 |
Purchases |  | 80,875 |  | 42,233 |
Sales/Paydowns/Return of Capital |  | (117,271) |  | (120,635) |
Total realized gain (loss) included in earnings |  | (29,380) |  | (23,940) |
Change in unrealized gain (loss) included in earnings |  | 2,188 |  | (1,059) |
Ending balance |  | 363,883 |  | 357,528 |
Changes in unrealized gains (losses) included in earnings related to investments still held at reporting date |  | $ (26,976) |  | $ (13,680) |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] |  | Gross Investment Income, Operating |  | Gross Investment Income, Operating |
First Lien Debt |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |
Beginning balance |  | $ 289,295 |  | $ 359,648 |
Transfers out of Level III | [1] |  |  | (18,021) |
Transfers into Level III | [2] | 47,303 |  |  |
Net accretion |  | 2,991 |  | 5,034 |
Purchases |  | 70,344 |  | 40,727 |
Sales/Paydowns/Return of Capital |  | (101,614) |  | (95,846) |
Total realized gain (loss) included in earnings |  | (11,908) |  | (704) |
Change in unrealized gain (loss) included in earnings |  | (6,454) |  | (1,543) |
Ending balance |  | 289,957 |  | 289,295 |
Changes in unrealized gains (losses) included in earnings related to investments still held at reporting date |  | (18,958) |  | (6,242) |
Second Lien Debt |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |
Beginning balance |  | 23,232 |  | 50,453 |
Transfers out of Level III | [1] |  |  | (1,178) |
Transfers into Level III |  | 18,022 | [2] | 1,643 | [3]
Net accretion |  | 116 |  | 283 |
Purchases |  | 2,361 |  | 857 |
Sales/Paydowns/Return of Capital |  | (10,526) |  | (26,708) |
Total realized gain (loss) included in earnings |  | (7,868) |  | (1,124) |
Change in unrealized gain (loss) included in earnings |  | 3,659 |  | (994) |
Ending balance |  | 28,996 |  | 23,232 |
Changes in unrealized gains (losses) included in earnings related to investments still held at reporting date |  | (2,312) |  | (2,037) |
Subordinated Debt |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |
Beginning balance |  | 1,225 |  | 43 |
Purchases |  | 997 |  |  |
Sales/Paydowns/Return of Capital |  | (511) |  | 5,568 |
Total realized gain (loss) included in earnings |  | (417) |  |  |
Change in unrealized gain (loss) included in earnings |  | 446 |  | (4,386) |
Ending balance |  | 1,740 |  | 1,225 |
Changes in unrealized gains (losses) included in earnings related to investments still held at reporting date |  | (1,932) |  | (4,388) |
Equity |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |
Beginning balance |  | 20,533 |  | 21,905 |
Purchases |  | 7,173 |  | 649 |
Sales/Paydowns/Return of Capital |  | 78 |  | (1,552) |
Total realized gain (loss) included in earnings |  | (6,611) |  | 3,334 |
Change in unrealized gain (loss) included in earnings |  | 3,589 |  | (3,803) |
Ending balance |  | 24,762 |  | 20,533 |
Changes in unrealized gains (losses) included in earnings related to investments still held at reporting date |  | (4,721) |  | (2,082) |
Collateralized Loan Obligations |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |
Beginning balance |  | 8,968 |  | 20,453 |
Net accretion |  | 1,511 |  | 1,998 |
Sales/Paydowns/Return of Capital |  | (2,722) |  | (2,097) |
Total realized gain (loss) included in earnings |  | (2,576) |  | (25,446) |
Change in unrealized gain (loss) included in earnings |  | 12 |  | 14,060 |
Ending balance |  | 5,193 |  | 8,968 |
Changes in unrealized gains (losses) included in earnings related to investments still held at reporting date |  | 11 |  | 5,461 |
Joint Ventures |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |
Beginning balance |  | 14,275 |  | 18,668 |
Sales/Paydowns/Return of Capital |  | (1,976) |  |  |
Change in unrealized gain (loss) included in earnings |  | 716 |  | (4,393) |
Ending balance |  | 13,015 |  | 14,275 |
Changes in unrealized gains (losses) included in earnings related to investments still held at reporting date |  | 716 |  | $ (4,392) |
Derivatives |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |
Change in unrealized gain (loss) included in earnings |  | 220 |  |  |
Ending balance |  | 220 |  |  |
Changes in unrealized gains (losses) included in earnings related to investments still held at reporting date |  | $ 220 |  |  |
[1] | Transfers out of Level III represent a transfer of $19.2 million relating to debt securities for which pricing inputs, other than their quoted prices in active markets were observable as of December 31, 2023
[2] | Transfers into Level III represent a transfer of $65.3 million relating to debt securities for which pricing inputs were unobservable as of December 31, 2024.
[3] | Transfers into Level III represent a transfer of $1.6 million relating to debt securities for which pricing inputs, other than their quoted prices in active markets were unobservable as of December 31, 2023.

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