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Income Taxes	6 Months Ended
Income Taxes	Jun. 30, 2013
Income Tax Disclosure [Abstract]
Income Taxes	4. Income Taxes Provision for income taxes is based upon the estimated annual effective income tax rate. The effective income tax rate for the six months ended June 30, 2013 and 2012 was (1.0%) and 19.9%, respectively. For the six months ended June 30, 2013, the difference in the effective income tax rate from the statutory rate is primarily due to an increase in the deferred tax asset valuation allowance offsetting the net operating loss carryforward generated in that period. For the six months ended June 30, 2012, the difference in the effective income tax rate from the statutory rate is primarily due to permanent timing differences between expenses recorded for financial and tax reporting, an increase in the deferred tax asset valuation allowance, and the reversal of a previously accrued tax provision.

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

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