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Discontinued Operations - Statements (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]                      
Income (loss) from discontinued operations $ 0 $ 0 $ 0 $ 550 $ (6,724) $ (4,924) $ (960) $ 364 $ 550 $ (12,244) $ 32,917
Cash provided by (used in) operating activities, discontinued operations                 (2,690) 11,296 29,356
Cash provided by (used in) investing activities, discontinued operations                 (28,470) (1,392) (6,631)
Held-for-sale                      
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]                      
Revenue                 12,346 73,065 93,880
Costs applicable to sales                 12,269 74,074 74,166
Amortization                 0 5,899 6,633
General and administrative                 41 172 101
Exploration                 0 23 0
Write-downs                 0 3,390 0
Pre-development, reclamation, and other                 265 4,664 2,808
Interest expense, net of capitalized interest                 (3) (27) (24)
Disposal Group, Including Discontinued Operations, Other Income (Expense)                 (260) 1,763 1,777
Pretax profit (loss) on discontinued operations related to major classes of pretax profit (loss)                 (492) (13,421) 11,925
Pretax gain on the disposal of the discontinued operation                 1,525 0 0
Total pretax gain or loss on discontinued operations                 1,033 (13,421) 11,925
Income and mining tax (expense) benefit                 (483) 1,177 20,992
Cash provided by (used in) operating activities, discontinued operations                 (2,690) 11,296 29,356
Cash provided by (used in) investing activities, discontinued operations                 $ (28,470) $ (1,392) $ (6,631)