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Other Long-Term Liabilities (Tables)
 6 Months Ended
Jun. 30, 2022
Other Liabilities, Noncurrent [Abstract]  
Schedule of Other Long-term Liabilities
Other long-term liabilities consist of the following as of December 31, 2021 and June 30, 2022 (in thousands):
December 31, 2021June 30, 2022
Contract liabilities, net of current portion$34,704 $35,629 
Asset retirement obligations9,122 7,835 
Other3,263 3,351 
Other long-term liabilities$47,089 $46,815