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Other Long-Term Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Other Liabilities, Noncurrent [Abstract]    
Contract liabilities, net of current portion $ 33,676 $ 34,866
Asset retirement obligations 8,651 7,647
Deferred payments related to acquisitions 0 715
Other 2,677 2,827
Other long-term liabilities $ 45,004 $ 46,055