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Other Long-Term Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Other Liabilities, Noncurrent [Abstract]    
Contract liabilities, net of current portion $ 32,116 $ 30,925
Asset retirement obligations 1,984 1,961
Deferred payments related to acquisitions 637 4,963
Employee separation costs 0 1,838
Other 1,415 1,764
Other long-term liabilities $ 36,152 $ 41,451