Income Taxes

The Company's income tax provisions attributable to income from continuing operations consisted of the following for the three months ended March 31, 2014 and 2013:



		Three Months Ended March 31,
		2014		2013
	(in millions)
Current		$	12	$	6
Deferred		41		44
Income tax provision		$	53	$	50

For the three months ended March 31, 2014, the Company's effective tax rate, excluding income attributable to the noncontrolling interest, was 26 percent, as compared to an effective rate of 37 percent for the same period in 2013. The Company's effective tax rates differed from the U.S. statutory rate of 35 percent primarily due to state income tax apportionments, nondeductible expenses and, for the three months ended March 31, 2014, the recognition of a $21 million tax benefit resulting from the resolution during the first quarter of 2014 of the tax uncertainty related to net operating loss carryovers and alternative minimum tax credits obtained from the 2012 acquisition of Premier Silica. There were no remaining unrecognized tax benefits as of March 31, 2014.

The Company files income tax returns in the U.S. federal and various state and foreign jurisdictions. The Internal Revenue Service has closed examinations of the 2011 and prior tax years and, with few exceptions, the Company believes that it is no longer subject to examinations by state and foreign tax authorities for years before 2008. As of March 31, 2014, no adjustments had been proposed in any jurisdiction that would have a significant effect on the Company's liquidity, future results of operations or financial position.