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Details Of Certain Accounts - Other Non-Current Liabilities (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
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Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |
Deferred revenue (Note 10) | $ 4,262 | $ 8,286
Asset retirement obligations (Note 14) | 0 | 28,258
Other | 2,024 | 2,100
Total other non-current liabilities | $ 6,286 | $ 38,644

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