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Sale of Vila Nova - Composition of Assets and Liabilities in Disposal Group (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Sep. 30, 2020
Dec. 31, 2019
Assets Held for Sale [Abstract]      
Cash $ 0   $ 67
Accounts receivable and other     714
Property, plant and equipment and iron ore inventory     11,690
Assets held for sale 0 $ 11,800 12,471
Liabilities Held for Sale [Abstract]      
Accounts payable and accrued liabilities     24
Asset retirement obligations     4,233
Liabilities associated with assets held for sale $ 0 $ 4,251 $ 4,257