Income Taxes (Details 3) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Net operating losses
Alternative minimum tax credit without expiration	$ 15,882,000	$ 15,882,000
ExpressJet
Net operating losses
Valuation allowance on acquired non-amortizable intangible tax assets and other tax assets	73,000,000	73,000,000
Deferred tax assets for net operating losses in states with short carry-forward periods	1,000,000
Federal
Net operating losses
Operating loss carryforward	272,000,000
State
Net operating losses
Operating loss carryforward	$ 736,500,000

The tax effect as of the balance sheet date of the amount of excess of tax deductions over gross income in a year which cannot be used on the tax return of a state or local jurisdiction in the current year but can be carried forward to reduce taxable income or income taxes payable in a future year, for which there must be sufficient tax-basis income to utilize a portion or all of the carryforward amount to realize the deferred tax asset.

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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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- 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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