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Other Long-Term Liabilities (Tables)
 12 Months Ended
Dec. 31, 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 2021 (in thousands):
 December 31, 2020December 31, 2021
Contract liabilities, net of current portion$34,866 $34,704 
Asset retirement obligations7,647 9,122 
Deferred payments related to acquisitions715 — 
Other2,827 3,263 
Other long-term liabilities$46,055 $47,089