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Other Income and (Expenses) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Analysis of income and expense [abstract]    
Change in closure and decommissioning estimates $ (221) $ (2,968)
Royalties income 909 631
Other expense (5,624) (1,322)
Other operating income (expense) $ (4,936) $ (3,659)