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Details Of Certain Accounts - Accrued Liabilities (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
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Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |
Accrued payroll and related benefits | $ 21,800 | $ 31,417
Investee losses in excess of investment (Note 4) | 2,248 | 4,069
Deferred revenue (Note 10) | 10,530 | 11,568
Asset retirement obligations (Note 14) | 29,562 | 0
Derivative liability (Note 19) | 0 | 1,002
Other | 16,128 | 14,333
Total accrued liabilities | $ 80,268 | $ 62,389

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