XML 63 R44.htm IDEA: XBRL DOCUMENT v3.20.4
Other Long-Term Liabilities (Tables)
 12 Months Ended
Dec. 31, 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 2020 (in thousands):
 December 31, 2019December 31, 2020
Contract liabilities, net of current portion$30,925 $34,866 
Asset retirement obligations1,961 7,647 
Deferred payments related to acquisitions4,963 715 
Employee separation costs1,838 — 
Other1,764 2,827 
Other long-term liabilities$41,451 $46,055