Income and Mining Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Examination [Line Items]
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount	$ 390	$ (137,706)	$ (565,295)
United States	(13,112)	(43,924)	(213,883)
Foreign	14,225	(349,522)	(1,401,245)
Income (loss) before income and mining taxes	1,113	(393,446)	(1,615,128)
Income tax provision from continuing operations
Income and mining tax benefit (expense)	54,239	26,263	428,254
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount	(336)	2,075	(20,253)
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount	(61,146)	101,027	151,191
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Depletion, Amount	983	0	0
Effective Income Tax Rate Reconciliation, Tax Contingency, Amount	4,619	1,947	4,425
Income Tax Reconciliation Domestic and Foreign Nondeductible Expenses	5,764	(1,365)	4,892
Effective Income Tax Reconciliation, Mineral Interests	0	19,310	0
Income Tax Reconciliation Foreign Exchange Rates	(19,701)	(22,350)	(23,672)
Income Tax Reconciliation Foreign Inflation And Indexing	(2,794)	(1,117)	(3,765)
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount	(413)	15,980	63,930
Income Tax Reconciliation Foreign Withholding Taxes	13,478	(8,140)	(82,884)
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount	(102)	4,076	43,177
Effective Tax Rate Reconciliation, Legal Entity Reorganization,Amount	(6,985)	0	0
United States - Alternative Minimum tax
Income tax provision from continuing operations
Federal tax expense (benefit)	0	49	904
United States - State Mining Taxes
Income tax provision from continuing operations
Federal tax expense (benefit)	(7,826)	(4,305)	(879)
Deferred Federal Income Tax Expense (Benefit)	748	1,952	0
United States - Foreign Withholding
Income tax provision from continuing operations
Federal tax expense (benefit)	(4,263)	0	(6,250)
ARGENTINA
Income tax provision from continuing operations
Foreign tax expense (benefit)	10	715	(71)
Deferred Foreign Income Tax Expense (Benefit)	115	(1,197)	24,478
AUSTRALIA
Income tax provision from continuing operations
Foreign tax expense (benefit)	14	130	0
Deferred Foreign Income Tax Expense (Benefit)	(1,638)	3,223	(401)
Mexico
Income tax provision from continuing operations
Foreign tax expense (benefit)	(9,581)	(476)	(10,122)
Deferred Foreign Income Tax Expense (Benefit)	55,383	27,189	394,221
BOLIVIA
Income tax provision from continuing operations
Foreign tax expense (benefit)	6,252	(5,154)	(4,008)
Deferred Foreign Income Tax Expense (Benefit)	0	0	22,122
CANADA
Income tax provision from continuing operations
Foreign tax expense (benefit)	(1,841)	(516)	(145)
Deferred Foreign Income Tax Expense (Benefit)	1,338	2,875	2,662
UNITED STATES
Income tax provision from continuing operations
Deferred Federal Income Tax Expense (Benefit)	15,556	1,778	5,743
NEW ZEALAND
Income tax provision from continuing operations
Deferred Foreign Income Tax Expense (Benefit)	$ (28)	$ 0	$ 0