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Debt Obligations - Future Payments and Interest Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Future principal payments of long-term debt |  |  |
2023 | $ 9,000 |  |
2024 | 7,332 |  |
2025 | 22,269 |  |
2026 | 2,644 |  |
2027 | 215,000 |  |
Total debt | 256,245 |  |
Interest expense |  |  |
Interest expense on notes to former owners | 1,139 | $ 1,052 | $ 1,354
Interest expense on borrowings and unused commitment fees | 10,955 | 3,371 | 5,319
Interest expense (income) on interest rate swaps | (332) | 499 | 338
Interest expense on finance leases | 4 | 57 |
Letter of credit fees | 800 | 679 | 830
Amortization of debt financing costs | 786 | 538 | 544
Total | $ 13,352 | $ 6,196 | $ 8,385

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