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Details Of Certain Accounts - Accrued Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Accrued payroll and related benefits $ 25,853 $ 43,079
Investee losses in excess of investment (Note 4) 7,638 5,125
Deferred revenue (Note 9) 10,814 10,103
Asset retirement obligations (Note 13) 11,556 0
Derivative liability (Note 17) 2,723 9,311
Other 13,398 17,976
Total accrued liabilities $ 71,982 $ 85,594