Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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Income Taxes (Details 3) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Operating loss carryforwards
Net operating loss carryforwards	$ 312,900,000us-gaap_OperatingLossCarryforwards
Valuation allowance offsetting the deferred tax assets	106,764,000	92,637,000
Unrecognized tax benefits would affect effective tax rate	0
Luxembourg and Chile
Operating loss carryforwards
Net operating loss carryforwards	42,200,000
Other non-U.S. Countries
Operating loss carryforwards
Net operating loss carryforwards	95,800,000
U.S
Operating loss carryforwards
Net operating loss carryforwards	50,500,000
Velardena Operations
Operating loss carryforwards
Net operating loss carryforwards	100,600,000
Other Mexico Exploration Activities
Operating loss carryforwards
Net operating loss carryforwards	$ 23,100,000