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Details Of Certain Accounts - Accrued Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Accrued payroll and related benefits $ 26,315 $ 31,417
Investee losses in excess of investment (Note 4) 1,940 4,069
Deferred revenue (Note 10) 9,795 11,568
Asset retirement obligations (Note 14) 30,279 0
Derivative liability (Note 19) 0 1,002
Other 16,328 14,333
Total accrued liabilities $ 84,657 $ 62,389