Income and Mining Taxes (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Income Tax Contingency [Line Items]
Unrecognized tax benefits that would impact effective income tax rate	$ 23,000		$ 23,000		$ 17,900
Penalties and interest accrued	14,700		14,700		$ 9,200
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest	13,729	$ (16,937)	(4,561)	$ (50,157)
Income and mining tax benefit (expense)	768	260	(1,338)	192
Minimum [Member]
Income Tax Contingency [Line Items]
Decrease in unrecognized tax benefits is reasonably possible	3,500		3,500
Maximum [Member]
Income Tax Contingency [Line Items]
Decrease in unrecognized tax benefits is reasonably possible	4,500		4,500
ARGENTINA
Income Tax Contingency [Line Items]
Foreign	4,453	(656)	3,438	(1,352)
Current Foreign Tax Expense (Benefit)	(1,793)	(1)	(250)	(2)
United States - Alternative Minimum tax [Member]
Income Tax Contingency [Line Items]
United States	119	(9,764)	(9,242)	(30,471)
Current Federal Tax Expense (Benefit)	(1,810)	319	(2,342)	2,204
Mexico [Member]
Income Tax Contingency [Line Items]
Foreign	3,353	(5,582)	(4,155)	(15,255)
Current Foreign Tax Expense (Benefit)	4,316	548	4,333	(716)
BOLIVIA
Income Tax Contingency [Line Items]
Foreign	4,016	(1,219)	6,062	(3,598)
Current Foreign Tax Expense (Benefit)	848	196	(722)	(1,211)
Other Countries [Member]
Income Tax Contingency [Line Items]
Foreign	1,788	284	(664)	519
Current Foreign Tax Expense (Benefit)	$ (793)	$ (802)	$ (2,357)	$ (83)