Income and Mining Taxes (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Income tax provision from continuing operations
Income before income and mining taxes	$ (33,219)	$ (41,880)
Income and mining tax benefit (expense)	(68)us-gaap_IncomeTaxExpenseBenefit	4,689us-gaap_IncomeTaxExpenseBenefit
United States - Alternative minimum tax [Member]
Income Tax Examination [Line Items]
Income (Loss) from Continuing Operations before Income Taxes, Domestic	(20,707)	(28,686)
Income tax provision from continuing operations
Federal tax expense (benefit)	1,886	(146)
Argentina [Member]
Income tax provision from continuing operations
Income (Loss) from Continuing Operations before Income Taxes, Foreign	(696)	(2,204)
Foreign tax expense (benefit)	(1)	4,432
Mexico [Member]
Income tax provision from continuing operations
Income (Loss) from Continuing Operations before Income Taxes, Foreign	(9,672)	(16,006)
Foreign tax expense (benefit)	(1,264)	3,721
BOLIVIA
Income tax provision from continuing operations
Income (Loss) from Continuing Operations before Income Taxes, Foreign	(2,379)	4,692
Foreign tax expense (benefit)	(1,407)	(2,764)
Other Countries [Member]
Income tax provision from continuing operations
Income (Loss) from Continuing Operations before Income Taxes, Foreign	235	324
Foreign tax expense (benefit)	$ 718	$ (554)

Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing 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))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 9

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Current Tax Expense (or Benefit)

-URI http://asc.fasb.org/extlink&oid=6509736

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 6.I.7)

-URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 6

-Section I

-Paragraph Question 1-7

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Amount of current foreign income tax expense (benefit) pertaining to income (loss) from continuing operations.

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

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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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Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest.

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

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