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Other Long-Term Liabilities (Tables)
 9 Months Ended
Sep. 30, 2020
Other Liabilities, Noncurrent [Abstract]  
Schedule of other long-term liabilities
Other long-term liabilities consist of the following as of December 31, 2019 and September 30, 2020 (in thousands):
December 31, 2019September 30, 2020
Contract liabilities, net of current portion$30,925 $32,116 
Asset retirement obligations1,961 1,984 
Deferred payments related to acquisitions4,963 637 
Employee separation costs1,838 — 
Other1,764 1,415 
Other long-term liabilities$41,451 $36,152