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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 | 6 Months Ended
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Jun. 30, 2024 | Jun. 30, 2023
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |
Beginning balance |  | $ 357,528 |  | $ 471,170 |
Transfers out of Level III |  | (7,018) | [1] | (10,599) | [2]
Transfers into Level III |  | 8,034 | [3] | 10,286 | [4]
Net accretion |  | 2,368 |  | 5,012 |
Purchases |  | 59,105 |  | 18,702 |
Sales/Paydowns/Return of Capital |  | (51,451) |  | (68,959) |
Total realized gain (loss) included in earnings |  | (7,954) |  | (9,492) |
Change in unrealized gain (loss) included in earnings |  | 71 |  | (9,544) |
Ending balance |  | 360,683 |  | 406,576 |
Changes in unrealized gains (losses) included in earnings related to investments still held at reporting date |  | (17,882) |  | (14,280) |
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 |  | (7,018) | [1] | (10,599) | [2]
Transfers into Level III |  | 8,034 | [3] | 8,278 | [4]
Net accretion |  | 1,268 |  | 3,366 |
Purchases |  | 51,684 |  | 17,850 |
Sales/Paydowns/Return of Capital |  | (46,292) |  | (45,320) |
Total realized gain (loss) included in earnings |  | (1,301) |  | (68) |
Change in unrealized gain (loss) included in earnings |  | (3,809) |  | (1,867) |
Ending balance |  | 291,861 |  | 331,288 |
Changes in unrealized gains (losses) included in earnings related to investments still held at reporting date |  | (10,588) |  | (6,573) |
Second Lien Debt |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |
Beginning balance |  | 23,232 |  | 50,453 |
Transfers into Level III | [4] |  |  | 2,008 |
Net accretion |  | 19 |  | 269 |
Purchases |  | 934 |  | 448 |
Sales/Paydowns/Return of Capital |  | (1,976) |  | (26,707) |
Total realized gain (loss) included in earnings |  |  |  | (1,123) |
Change in unrealized gain (loss) included in earnings |  | 189 |  | (1,138) |
Ending balance |  | 22,398 |  | 24,210 |
Changes in unrealized gains (losses) included in earnings related to investments still held at reporting date |  | (2,503) |  | (2,178) |
Subordinated Debt |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |
Beginning balance |  | 1,225 |  | 43 |
Purchases |  | 944 |  |  |
Sales/Paydowns/Return of Capital |  | (459) |  | 5,567 |
Total realized gain (loss) included in earnings |  | (419) |  |  |
Change in unrealized gain (loss) included in earnings |  | 402 |  | (4,115) |
Ending balance |  | 1,693 |  | 1,495 |
Changes in unrealized gains (losses) included in earnings related to investments still held at reporting date |  | (1,974) |  | (4,116) |
Equity |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |
Beginning balance |  | 20,533 |  | 21,905 |
Purchases |  | 5,543 |  | 404 |
Sales/Paydowns/Return of Capital |  | (817) |  | (1,526) |
Total realized gain (loss) included in earnings |  | (5,411) |  | 1,175 |
Change in unrealized gain (loss) included in earnings |  | 3,982 |  | (1,945) |
Ending balance |  | 23,830 |  | 20,013 |
Changes in unrealized gains (losses) included in earnings related to investments still held at reporting date |  | (2,124) |  | (933) |
Collateral Loan Obligations |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |
Beginning balance |  | 8,968 |  | 20,453 |
Net accretion |  | 1,081 |  | 1,377 |
Sales/Paydowns/Return of Capital |  | (938) |  | (973) |
Total realized gain (loss) included in earnings |  | (823) |  | (9,476) |
Change in unrealized gain (loss) included in earnings |  | (934) |  | 1,615 |
Ending balance |  | 7,354 |  | 12,996 |
Changes in unrealized gains (losses) included in earnings related to investments still held at reporting date |  | (935) |  | 1,615 |
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 |  | (969) |  |  |
Change in unrealized gain (loss) included in earnings |  | 241 |  | (2,094) |
Ending balance |  | 13,547 |  | 16,574 |
Changes in unrealized gains (losses) included in earnings related to investments still held at reporting date |  | $ 241 |  | $ (2,094) |
[1] | Transfers out of Level III represent a transfer of $7.0 million relating to debt securities for which pricing inputs, other than their quoted prices in active markets were observable as of June 30, 2024.
[2] | Transfers out of Level III represent a transfer of $10.6 million relating to debt securities for which pricing inputs, other than their quoted prices in active markets were observable as of June 30, 2023.
[3] | Transfers into Level III represent a transfer of $8.0 million relating to debt securities for which pricing inputs, other than their quoted prices in active markets were unobservable as of June 30, 2024.
[4] | Transfers into Level III represent a transfer of $10.3 million relating to debt securities for which pricing inputs, other than their quoted prices in active markets were unobservable as of June 30, 2023.

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