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Other Expenses (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Analysis of income and expense [abstract]    
Change in closure and decommissioning estimates $ 5,230 $ 221
Change in provisions 7,493 0
Commissions on investment dispositions 3,465 0
Other expense 5,879 4,715
Other operating income (expense) $ 22,067 $ 4,936