The tax effect as of the balance sheet date of the amount of future tax deductions arising from unused alternative minimum tax credit carryforwards; a tax credit carryforward is the amount by which tax credits available for utilization exceeded statutory limits on inclusion in historical filings, and which can only be utilized if sufficient tax-basis income is generated in future periods and providing tax laws continue to allow such utilization.

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The domestic federal statutory tax rate applicable under enacted tax laws to the Company's pretax income from continuing operations for the period. The "statutory" tax rate is the regular tax rate if there are alternative tax systems.

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- Definition

Amount of an unrecognized tax benefit that is directly related to a position taken in a tax year that results in a net operating loss carryforward. This amount is presented as a reduction of the related deferred tax asset in the balance sheet if that deferred tax asset is not used. This amount is presented separately from the deferred tax asset for a net operating loss carryforward if this unrelated tax benefit is associated with a different tax position.

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Income Taxes (Details) (USD $)	12 Months Ended
Income Taxes (Details) (USD $)	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Tax [Line Items]
Period of Average Annual Book Income Before Taxes	3 years
Alternative Minimum Tax Benefit			$ 10,200,000
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax	21,599,000	19,863,000
Other Noncash Income Tax Expense	4,800,000
Federal statutory tax rate	35.00%	35.00%	35.00%
Twenty Year Life
Income Tax [Line Items]
Unrecognized Tax Benefits Resulting in Net Operating Loss Carryforward	7,700,000
Period of Operating Loss Carryforwards, In Years	20 years
Five Year Life
Income Tax [Line Items]
Unrecognized Tax Benefits Resulting in Net Operating Loss Carryforward	$ 100,000
Period of Operating Loss Carryforwards, In Years	5 years