Income and Mining Taxes (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]
Income and mining tax (expense) benefit	$ 459,244us-gaap_IncomeTaxExpenseBenefit	$ 158,116us-gaap_IncomeTaxExpenseBenefit	$ (70,807)us-gaap_IncomeTaxExpenseBenefit
United States - Alternative minimum tax [Member]
Current Income Tax Expense (Benefit), Continuing Operations [Abstract]
Federal tax expense (benefit)	904	4	(257)
United States - State Mining Taxes [Member]
Current Income Tax Expense (Benefit), Continuing Operations [Abstract]
Federal tax expense (benefit)	(879)	(714)	(2,195)
United States - Foreign Withholding [Member]
Current Income Tax Expense (Benefit), Continuing Operations [Abstract]
Federal tax expense (benefit)	(6,250)	397	(736)
Argentina [Member]
Current Income Tax Expense (Benefit), Continuing Operations [Abstract]
Foreign tax expense (benefit)	(71)	(137)	976
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]
Deferred foreign (expense) benefit	24,478	8,062	0
Australia [Member]
Current Income Tax Expense (Benefit), Continuing Operations [Abstract]
Foreign tax expense (benefit)	0	(914)	(1,760)
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]
Deferred foreign (expense) benefit	(401)	(2)	(223)
Mexico [Member]
Current Income Tax Expense (Benefit), Continuing Operations [Abstract]
Foreign tax expense (benefit)	(1,124)	(9,046)	(7,814)
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]
Deferred foreign (expense) benefit	417,068	94,851	(10,579)
Bolivia [Member]
Current Income Tax Expense (Benefit), Continuing Operations [Abstract]
Foreign tax expense (benefit)	(4,008)	(6,716)	(43,546)
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]
Deferred foreign (expense) benefit	22,122	(4,222)	(1,087)
Canada [Member]
Current Income Tax Expense (Benefit), Continuing Operations [Abstract]
Foreign tax expense (benefit)	(145)	(1,936)	0
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]
Deferred foreign (expense) benefit	1,807	0	0
United States [Member]
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]
Deferred federal (expense) benefit	$ 5,743	$ 78,489	$ (3,586)

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

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