Income and Mining Taxes - Income (Loss) Before Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2018	Mar. 31, 2017
Income Tax Examination [Line Items]
Tax (expense) benefit	$ 11,949	$ 10,878
Total	12,640	29,177
United States
Income Tax Examination [Line Items]
Income (loss) before tax, United States	1,187	20,653
Tax (expense) benefit	517	(1,827)
Argentina
Income Tax Examination [Line Items]
Tax (expense) benefit	10	1,124
Income (loss) before tax, Foreign	254	(328)
Mexico
Income Tax Examination [Line Items]
Tax (expense) benefit	(13,222)	(9,923)
Income (loss) before tax, Foreign	13,126	8,650
Other jurisdictions
Income Tax Examination [Line Items]
Tax (expense) benefit	746	(252)
Income (loss) before tax, Foreign	$ (1,927)	$ 202

The portion of earnings or loss from continuing operations before income taxes that is attributable to domestic operations.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h)(1)(i))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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The portion of earnings or loss from continuing operations before income taxes that is attributable to foreign operations, which is defined as Income or Loss generated from operations located outside the entity's country of domicile.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (a),(b)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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