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Other Long-Term Liabilities (Tables) | 9 Months Ended
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Sep. 30, 2021
Other Liabilities, Noncurrent [Abstract] |
Schedule of Other Long-term Liabilities | Other long-term liabilities consist of the following as of December 31, 2020 and September 30, 2021 (in thousands):
| December 31, 2020 |  | September 30, 2021
Contract liabilities, net of current portion | $ | 34,866 |  |  | $ | 33,201 |
Asset retirement obligations | 7,647 |  |  | 7,944 |
Deferred payments related to acquisitions | 715 |  |  | — |
Other | 2,827 |  |  | 2,625 |
Other long-term liabilities | $ | 46,055 |  |  | $ | 43,770 |

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