Income Taxes	6 Months Ended
Jun. 30, 2015
Income Taxes
Income Taxes	R. INCOME TAXES Our effective tax rate was 46 percent and 43 percent for the three months and six months ended June 30, 2015, respectively primarily due to an $18 million valuation allowance against the deferred tax assets of TopBuild recorded as a non-cash charge to income tax expense in the second quarter of 2015. The TopBuild deferred tax assets have been impaired by our decision to spin off TopBuild into a separate company that on a stand-alone basis as of June 30, 2015, the spin off date, will unlikely be able to realize the value of such deferred tax assets as a result of its history of recent losses. Our effective tax rate was 20 percent and 14 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 and from a $19 million state income tax benefit on uncertain tax positions primarily due to the expiration of applicable statutes of limitation.

Income Taxes

6 Months Ended

Jun. 30, 2015

R. INCOME TAXES

Our effective tax rate was 46 percent and 43 percent for the three months and six months ended June 30, 2015, respectively primarily due to an $18 million valuation allowance against the deferred tax assets of TopBuild recorded as a non-cash charge to income tax expense in the second quarter of 2015. The TopBuild deferred tax assets have been impaired by our decision to spin off TopBuild into a separate company that on a stand-alone basis as of June 30, 2015, the spin off date, will unlikely be able to realize the value of such deferred tax assets as a result of its history of recent losses.

Our effective tax rate was 20 percent and 14 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 and from a $19 million state income tax benefit on uncertain tax positions primarily due to the expiration of applicable statutes of limitation.