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Debt Obligations - Future Payments and Interest Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Future principal payments of long-term debt |  |  |
2024 | $ 4,867 |  |
2025 | 21,701 |  |
2026 | 14,144 |  |
2027 | 3,500 |  |
Total debt | 44,212 |  |
Interest expense |  |  |
Interest expense on borrowings and unused commitment fees | 7,507 | $ 10,955 | $ 3,371
Interest expense (income) on interest rate swaps |  | (332) | 499
Interest expense on finance leases |  | 4 | 57
Letter of credit fees | 724 | 800 | 679
Amortization of debt financing costs | 685 | 786 | 538
Total | 10,281 | 13,352 | 6,196
Related Party |  |  |
Interest expense |  |  |
Interest expense on notes to former owners | $ 1,365 | $ 1,139 | $ 1,052

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