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Borrowings - Schedule of Information about Senior Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Debt Instrument [Line Items] |  |  |
Total Amount Outstanding Exclusive of Treasury Securities |  |  | $ 267,479
Fiscal 2015 |  |  |
Debt Instrument [Line Items] |  |  |
Total Amount Outstanding Exclusive of Treasury Securities | [1] | $ 208,049 |
Asset Coverage per Unit | [2] | 2,025 |
Fiscal 2016 |  |  |
Debt Instrument [Line Items] |  |  |
Total Amount Outstanding Exclusive of Treasury Securities | [1] | 180,881 |
Asset Coverage per Unit | [2] | 2,048 |
Fiscal 2017 |  |  |
Debt Instrument [Line Items] |  |  |
Total Amount Outstanding Exclusive of Treasury Securities | [1] | 104,407 |
Asset Coverage per Unit | [2] | 2,713 |
Fiscal 2018 |  |  |
Debt Instrument [Line Items] |  |  |
Total Amount Outstanding Exclusive of Treasury Securities | [1] | 103,763 |
Asset Coverage per Unit | [2] | 2,490 |
Fiscal 2019 |  |  |
Debt Instrument [Line Items] |  |  |
Total Amount Outstanding Exclusive of Treasury Securities | [1],[3] | 156,978 |
Asset Coverage per Unit | [2],[3] | 1,950 |
Fiscal 2020 |  |  |
Debt Instrument [Line Items] |  |  |
Total Amount Outstanding Exclusive of Treasury Securities | [1],[4] | 377,910 |
Asset Coverage per Unit | [2],[4] | 1,560 |
Fiscal 2021 |  |  |
Debt Instrument [Line Items] |  |  |
Total Amount Outstanding Exclusive of Treasury Securities | [1],[5] | 352,434 |
Asset Coverage per Unit | [2],[5] | 1,780 |
Fiscal 2022 |  |  |
Debt Instrument [Line Items] |  |  |
Total Amount Outstanding Exclusive of Treasury Securities | [1],[6] | 378,163 |
Asset Coverage per Unit | [2],[6] | 1,601 |
Fiscal 2023 |  |  |
Debt Instrument [Line Items] |  |  |
Total Amount Outstanding Exclusive of Treasury Securities | [1],[7] | 325,683 |
Asset Coverage per Unit | [1],[7] | 1,646 |
Fiscal 2024 |  |  |
Debt Instrument [Line Items] |  |  |
Total Amount Outstanding Exclusive of Treasury Securities | [1],[8] | 267,479 |
Asset Coverage per Unit | [2],[8] | 1,667 |
March 31, 2025 |  |  |
Debt Instrument [Line Items] |  |  |
Total Amount Outstanding Exclusive of Treasury Securities | [1],[9] | 255,379 |
Asset Coverage per Unit | [2],[9] | 1,679 |
June 30, 2025 |  |  |
Debt Instrument [Line Items] |  |  |
Total Amount Outstanding Exclusive of Treasury Securities | [1],[10] | 255,379 |
Asset Coverage per Unit | [2],[10] | 1,645 |
September 30, 2025 |  |  |
Debt Instrument [Line Items] |  |  |
Total Amount Outstanding Exclusive of Treasury Securities | [1],[11] | 324,611 |
Asset Coverage per Unit | [2],[11] | $ 1,713 |
[1] | Total amount of each class of senior securities outstanding at the end of the period presented.
[2] | Asset coverage per unit is the ratio of the carrying value of the Company’s total consolidated assets, less all liabilities and indebtedness not represented by senior securities, to the aggregate amount of senior securities representing indebtedness. Asset coverage per unit is expressed in terms of dollar amounts per $1,000 of indebtedness.
[3] | As of December 31, 2019, the Total Amount Outstanding Exclusive of Treasury Securities consisted of 6.125% Notes Due 2022 of $77,407 and Revolving Credit Facility of $79,571.
[4] | As of December 31, 2020, the Total Amount Outstanding Exclusive of Treasury Securities consisted of 6.125% Notes Due 2022 of $76,726, Revolving Credit Facility of $49,321 and 2018-2 Secured Notes of $251,863.
[5] | As of December 31, 2021, the Total Amount Outstanding Exclusive of Treasury Securities consisted of 4.875% Notes due 2026 of $108,000, Revolving Credit Facility of $80,571 and 2018-2 Secured Notes of $163,863.
[6] | As of December 31, 2022, the Total Amount Outstanding Exclusive of Treasury Securities consisted of 4.875% Notes due 2026 of $108,000, Revolving Credit Facility of $92,000 and 2018-2 Secured Notes of $178,163.
[7] | As of December 31, 2023, the Total Amount Outstanding Exclusive of Treasury Securities consisted of 4.875% Notes due 2026 of $108,000, Revolving Credit Facility of $92,000 and 2018-2 Secured Notes of $125,683.
[8] | As of December 31, 2024, the Total Amount Outstanding Exclusive of Treasury Securities consisted of 4.875% Notes due 2026 of $108,000 and Revolving Credit Facility of $159,479.
[9] | As of March 31, 2025, the Total Amount Outstanding Exclusive of Treasury Securities consisted of 4.875% Notes due 2026 of $108,000 and Revolving Credit Facility of $147,379.
[10] | As of June 30, 2025, the Total Amount Outstanding Exclusive of Treasury Securities consisted of 4.875% Notes due 2026 of $108,000 and Revolving Credit Facility of $147,379.
[11] | As of September 30, 2025, the Total Amount Outstanding Exclusive of Treasury Securities consisted of 4.875% Notes due 2026 of $108,000, Revolving Credit Facility of $130,779, 2026 Notes of $50,000, 2032 Convertible Notes of $2,500 and KeyBank Credit Facility of $33,332.

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