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Debt Obligations - Future Payments (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Future principal payments of long-term debt |  |  |
2022 | $ 23,000 |  |
2023 | 34,000 |  |
2023 | 26,500 |  |
2024 | 152,500 |  |
Total debt | 236,000 |  |
Interest expense |  |  |
Interest expense on notes to former owners | 1,354 | $ 1,531 | $ 642
Interest expense on borrowings and unused commitment fees | 5,319 | 6,887 | 2,211
Interest expense on interest rate swaps | 338 |  |
Letter of credit fees | 830 | 512 | 474
Amortization of debt financing costs | 544 | 387 | 383
Total | $ 8,385 | $ 9,317 | $ 3,710

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