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Other Long-Term Liabilities (Tables)
3 Months Ended
Mar. 31, 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 March 31, 2022 (in thousands):
December 31, 2021March 31, 2022
Contract liabilities, net of current portion$34,704 $35,259 
Asset retirement obligations9,122 9,423 
Other3,263 3,405 
Other long-term liabilities$47,089 $48,087