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Income Taxes (Details 2) (USD $)	12 Months Ended
Income Taxes (Details 2) (USD $)	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Operating loss carryforwards
Net increase in valuation allowance	$ 47,900,000	$ 22,600,000	$ 22,100,000
Unrecognized deferred tax benefits	16,000,000
Unrecognized deferred tax benefits related to stock option exercises, accounted for as a credit to additional paid-in capital realized through a reduction in income taxes payable	81,000
Federal income tax
Operating loss carryforwards
Net operating loss carryforwards to reduce future taxable income	449,000,000
State income tax
Operating loss carryforwards
Net operating loss carryforwards to reduce future taxable income	$ 118,100,000

Tax benefit associated with any equity-based compensation plan other than an employee stock ownership plan (ESOP). The tax benefit results from the deduction by the entity on its tax return for an award of stock that exceeds the cumulative compensation cost for common stock or preferred stock recognized for financial reporting. Includes any resulting tax benefit that exceeds the previously recognized deferred tax asset (excess tax benefits).

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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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