Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards.

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Amount of deferred tax liability attributable to taxable temporary differences, net of deferred tax asset attributable to deductible temporary differences and carryforwards net of valuation allowances expected to be realized or consumed after one year (or the normal operating cycle, if longer).

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- Definition

Amount of deferred tax liability attributable to taxable temporary differences from property, plant, and equipment.

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- Definition

The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.

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Income Taxes (Details) (USD $)	3 Months Ended		9 Months Ended			3 Months Ended	9 Months Ended		3 Months Ended	9 Months Ended
Income Taxes (Details) (USD $)	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012	Sep. 30, 2012 Mexico	Sep. 30, 2012 Mexico	Dec. 31, 2012 Mexico	Jun. 30, 2013 Velardena Operations	Sep. 30, 2013 Velardena Operations	Dec. 31, 2012 Velardena Operations
Components of the deferred tax assets and deferred tax liabilities
Income tax benefit related to a lapse of the statute of limitations in the jurisdiction	$ 100,000
Income tax benefit	104,000	2,614,000	47,599,000	5,574,000		2,600,000	5,600,000		45,000,000	47,600,000
Net deferred tax liabilities	0		0		47,072,000
Deferred tax assets	0		0
Deferred tax liabilities, related to basis differences of properties, plant and equipment at the Velardena Operations in Mexico											63,700,000
Deferred tax assets related to Mexico net operating losses								16,300,000
Unrecognized tax benefits	$ 2,100,000		$ 2,100,000		$ 2,500,000