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Other Long-Term Liabilities (Tables)
 6 Months Ended
Jun. 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 June 30, 2021 (in thousands):
December 31, 2020June 30, 2021
Contract liabilities, net of current portion$34,866 $33,676 
Asset retirement obligations7,647 8,651 
Deferred payments related to acquisitions715 — 
Other2,827 2,677 
Other long-term liabilities$46,055 $45,004