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Discontinued Operations - Statements (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]                      
Write-downs                 $ 43,600 $ 201,500 $ 5,700
Income (loss) from discontinued operations $ 0 $ 0 $ 0 $ 5,693 $ 0 $ 0 $ 0 $ 550 5,693 550 (12,244)
Cash provided by (used in) operating activities, discontinued operations                 0 (2,690) 11,296
Cash provided by (used in) investing activities, discontinued operations                 0 (28,470) (1,392)
Held-for-sale                      
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]                      
Revenue                 0 12,346 73,065
Costs applicable to sales                 0 12,269 74,074
Amortization                 0 0 5,899
General and administrative                 0 41 172
Exploration                 0 0 23
Write-downs                 0 0 3,390
Pre-development, reclamation, and other                 0 265 4,664
Interest expense, net of capitalized interest                 0 (3) (27)
Disposal Group, Including Discontinued Operations, Other Income (Expense)                 0 (260) 1,763
Pretax profit (loss) on discontinued operations related to major classes of pretax profit (loss)                 0 (492) (13,421)
Pretax gain on the disposal of the discontinued operation                 5,693 1,525 0
Total pretax gain or loss on discontinued operations                 5,693 1,033 (13,421)
Income and mining tax (expense) benefit                 0 (483) 1,177
Income (loss) from discontinued operations                 5,693 550 (12,244)
Cash provided by (used in) operating activities, discontinued operations                   11,300 (2,700)
Cash provided by (used in) investing activities, discontinued operations                 $ 0 $ (28,500) $ 1,400