Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences not separately disclosed.

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Carrying amount as of the balance sheet date of income taxes previously overpaid to tax authorities (such as U.S. Federal, state and local tax authorities) representing refunds of overpayments or recoveries based on agreed-upon resolutions of disputes. Also called income tax refund receivable.

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- Definition

The amount of the valuation allowance recorded as of the balance sheet date pertaining to the specified deferred tax asset for which an assessment was made that it is more likely than not that all or a portion of such deferred tax asset will not be realized through related deductions on future tax returns.

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- Definition

The amount of the change in the period in the valuation allowance for a specified deferred tax asset.

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Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2010
Income Taxes [Abstract]
Increase in deferred tax asset valuation allowance	$ 1,900
Valuation Allowance, Amount	128,433
Income Tax Expense Adjustment		473
Income Tax Receivable Reduction		473
Income Taxes Receivable	1,293		1,293
Deferred tax effect of gain on sale of property				$ 24,355