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		6 Months Ended
Income Taxes (Details) (USD $)	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Components of the deferred tax assets and deferred tax liabilities
Income tax benefit	$ 45,017,000	$ 1,189,000	$ 47,495,000	$ 2,960,000
Net deferred tax liabilities	0		0		47,072,000
Deferred tax assets	0		0
Unrecognized tax benefits	2,200,000		2,200,000		2,500,000
Mexico
Components of the deferred tax assets and deferred tax liabilities
Deferred tax assets related to Mexico net operating losses					16,300,000
Velardena Operations
Components of the deferred tax assets and deferred tax liabilities
Income tax benefit	45,000,000
Deferred tax liabilities, related to basis differences of properties, plant and equipment at the Velardena Operations in Mexico					$ 63,700,000