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Senior Notes (Tables) | 12 Months Ended
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Dec. 31, 2021
Debt Disclosure [Abstract] |
Schedule of Carrying Values | The carrying value of our Senior Notes is reflected on our Consolidated Balance Sheet as follows (in thousands):
| December 31, 2020 |  | December 31, 2021
Long-term liabilities: |  |  |
Principal amount | $ | 400,000 |  |  | $ | 400,000 |
Debt premium, net of accumulated amortization of $221 | 1,467 |  |  | — |
Debt discount, net of accumulated amortization of $1,293 and $301, respectively | (3,582) |  |  | (4,199) |
Debt issuance costs, net of accumulated amortization of $496 and $86, respectively | (1,917) |  |  | (1,191) |
Carrying value of the Senior Notes | $ | 395,968 |  |  | $ | 394,610 |
Schedule of Maturities of Long-term Debt | The aggregate maturities of our Credit Facility and acquisition debt for the next five years subsequent to December 31, 2021 and thereafter, excluding debt issuance costs, are as follows (in thousands):
| Credit Facility |  | Acquisition Debt
Years ending December 31, |  |  |
2022 | $ | — |  |  | $ | 825 |
2023 | — |  |  | 825 |
2024 | — |  |  | 772 |
2025 | — |  |  | 772 |
2026 | 155,400 |  |  | 325 |
Thereafter | — |  |  | 3,007 |
Total Credit Facility and acquisition debt | $ | 155,400 |  |  | $ | 6,526 |
Less: Interest | — |  |  | (2,026) |
Present value of Credit Facility and acquisition debt | $ | 155,400 |  |  | $ | 4,500 |
The aggregate maturities of our Senior Notes for the next five years subsequent to December 31, 2021 and thereafter are as follows (in thousands):
|  | Principal Maturity |  | Discount Amortization |  |  |  | Carrying Value
Years ending December 31, |  |  |  |  |  |  |  |
2022 |  | $ | — |  |  | $ | (493) |  |  |  |  | $ | (493) |
2023 |  | — |  |  | (515) |  |  |  |  | (515) |
2024 |  | — |  |  | (539) |  |  |  |  | (539) |
2025 |  | — |  |  | (563) |  |  |  |  | (563) |
2026 |  | — |  |  | (588) |  |  |  |  | (588) |
Thereafter |  | 400,000 |  |  | (1,501) |  |  |  |  | 398,499 |
Total |  | $ | 400,000 |  |  | $ | (4,199) |  |  |  |  | $ | 395,801 |
Schedule of Long-term Debt Instruments | Our Credit Facility and Acquisition debt consisted of the following (in thousands):
| December 31, 2020 |  | December 31, 2021
Credit Facility | $ | 47,200 |  |  | $ | 155,400 |
Debt issuance costs, net of accumulated amortization of $819 and $1,324, respectively | (1,136) |  |  | (1,543) |
Total Credit Facility | $ | 46,064 |  |  | $ | 153,857 |
Acquisition debt | $ | 5,509 |  |  | $ | 4,500 |
Less: current portion | (1,027) |  |  | (521) |
Total acquisition debt, net of current portion | $ | 4,482 |  |  | $ | 3,979 |
The interest expense and amortization of debt issuance costs related to our Credit Facility are as follows (in thousands):
| Years ended December 31,
| 2019 |  | 2020 |  | 2021
Credit Facility interest expense | $ | 1,601 |  |  | $ | 3,738 |  |  | $ | 1,820 |
Credit Facility amortization of debt issuance costs | 229 |  |  | 482 |  |  | 380 |
The imputed interest expense related to our acquisition debt is as follows (in thousands):
| Years ended December 31,
| 2019 |  | 2020 |  | 2021
Acquisition debt imputed interest expense | $ | 622 |  |  | $ | 489 |  |  | $ | 364 |
The interest expense and accretion of debt discount and debt issuance costs related to our Convertible Notes are as follows (in thousands):
| Years ended December 31,
| 2019 |  | 2020 |  | 2021
Convertible Notes interest expense | $ | 174 |  |  | $ | 149 |  |  | $ | 18 |
Convertible Notes accretion of debt discount | 241 |  |  | 216 |  |  | 20 |
Convertible Notes amortization of debt issuance costs | 24 |  |  | 20 |  |  | 1 |
The interest expense and amortization of debt discount, debt premium and debt issuance costs related to our Senior Notes are as follows (in thousands):
| Years ended December 31,
| 2019 |  | 2020 |  | 2021
Senior Notes interest expense | $ | 21,711 |  |  | $ | 26,500 |  |  | $ | 21,767 |
Senior Notes amortization of debt discount | 493 |  |  | 528 |  |  | 504 |
Senior Notes amortization of debt premium | — |  |  | 221 |  |  | 85 |
Senior Notes amortization of debt issuance costs | 139 |  |  | 280 |  |  | 195 |

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