Discontinued Operations - Statements (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]
Income (loss) from discontinued operations	$ 5,693	$ 550
Cash provided by (used in) operating activities, discontinued operations	0	(2,690)
Cash provided by (used in) investing activities, discontinued operations	0	(28,470)
Held-for-sale
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]
Revenue	0	12,346
Costs applicable to sales	0	12,269
General and administrative	0	41
Pre-development, reclamation, and other	0	265
Interest expense, net of capitalized interest	0	(3)
Disposal Group, Including Discontinued Operations, Other Income (Expense)	0	(260)
Pretax profit (loss) on discontinued operations related to major classes of pretax profit (loss)	0	(492)
Pretax gain on the disposal of the discontinued operation	5,693	1,525
Total pretax gain or loss on discontinued operations	5,693	1,033
Income and mining tax (expense) benefit	$ 0	(483)
Cash provided by (used in) operating activities, discontinued operations		(2,690)
Cash provided by (used in) investing activities, discontinued operations		$ (28,470)

Disposal Group, Including Discontinued Operation, Pre Development

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Amount of other income (expense) attributable to disposal group, including, but not limited to, discontinued operations.

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Amount of cash inflow (outflow) of investing activities of discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

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Amount of cash inflow (outflow) of operating activities of discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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Amount before tax of gain (loss) not previously recognized resulting from the disposal of a discontinued operation.

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Amount before tax of income (loss) from a discontinued operation. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.

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Amount before tax of income (loss) from operations classified as a discontinued operation. Excludes gain (loss) on disposal and provision for gain (loss) until its disposal.

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Amount of tax (expense) benefit on (gain) loss recognized for the (reversal of write-down) write-down to fair value, less cost to sell, of a discontinued operation.

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Amount of costs of goods sold attributable to disposal group, including, but not limited to, discontinued operation.

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Amount of general and administrative expense attributable to disposal group, including, but not limited to, discontinued operation.

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Amount of interest expense attributable to disposal group, including, but not limited to, discontinued operation.

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Amount of revenue attributable to disposal group, including, but not limited to, discontinued operation.

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Amount after tax of income (loss) from a discontinued operation attributable to the parent. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.

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