Discontinued Operations - Narrative (Details) - USD ($) $ in Thousands		12 Months Ended
Dec. 22, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
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
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net smelter returns royalty, estimated value	$ 7,100
Value added tax receivable, outstanding	12,700
Promissory note receivable	26,900
Expected post-closing obligations	$ 5,700
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)
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax		$ 1,525	$ 0	$ 0

Disposal Group, Including Discontinued Operation, Agreement, Expected Post Closing Obligations

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Disposal Group, Including Discontinued Operation, Agreement, Net Smelter Returns, Estimated Value

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Disposal Group, Including Discontinued Operation, Agreement, Note Receivable

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Disposal Group, Including Discontinued Operation, Agreement, Value Added Tax Receivable

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- Definition

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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
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-Section 50
-Paragraph 5B
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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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