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Income Taxes	6 Months Ended
Income Taxes	Jun. 30, 2014
Income Taxes
Income Taxes	Q. Our effective tax rate of 19 percent and 15 percent for the three months and six months ended June 30, 2014, respectively, primarily due to the decrease in the valuation allowance resulting from the partial utilization of our U.S. Federal net operating loss carryforward. The effective tax rate for the first half of 2014 includes a $19 million tax benefit primarily from a state tax benefit on uncertain tax positions due to the expiration of applicable statutes of limitation. Our effective tax rate of 30 percent and 24 percent for the three months and six months ended June 30, 2013, respectively, primarily due to the decrease in the valuation allowance resulting from the partial utilization of our U.S. Federal net operating loss carryforward. The effective tax rate for the first half of 2013 includes an $11 million state tax benefit on uncertain tax positions due primarily to the expiration of applicable statutes of limitation.

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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