Income Taxes	6 Months Ended
Jun. 30, 2015
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes Our effective tax rate was 38 percent in second quarter 2015 and 37 percent in first six months 2015. Our effective tax rate for first six months 2015 includes a one percent benefit for noncontrolling interests and a two percent detriment for a state valuation allowance and share-based compensation benefits that will not be realized. Our effective tax rate was 35 percent in second quarter 2014 and first six months 2014, which included a one percent benefit for noncontrolling interests. Our effective tax rates also include the effect of state income taxes, nondeductible items and benefits of percentage depletion. We have not provided a valuation allowance for our federal deferred tax asset and the majority of our state deferred tax assets because, although realization is not assured, we believe it is more likely than not they will be recoverable in future periods based on considerations including taxable income in prior carryback years, future reversals of existing temporary differences, tax planning strategies and future taxable income. The amount of deferred tax assets considered recoverable, however, could be reduced if estimates of future taxable income are reduced due to additional oil and gas restructuring costs or other factors.

Income Taxes

6 Months Ended

Jun. 30, 2015

Our effective tax rate was 38 percent in second quarter 2015 and 37 percent in first six months 2015. Our effective tax rate for first six months 2015 includes a one percent benefit for noncontrolling interests and a two percent detriment for a state valuation allowance and share-based compensation benefits that will not be realized. Our effective tax rate was 35 percent in second quarter 2014 and first six months 2014, which included a one percent benefit for noncontrolling interests. Our effective tax rates also include the effect of state income taxes, nondeductible items and benefits of percentage depletion.

We have not provided a valuation allowance for our federal deferred tax asset and the majority of our state deferred tax assets because, although realization is not assured, we believe it is more likely than not they will be recoverable in future periods based on considerations including taxable income in prior carryback years, future reversals of existing temporary differences, tax planning strategies and future taxable income. The amount of deferred tax assets considered recoverable, however, could be reduced if estimates of future taxable income are reduced due to additional oil and gas restructuring costs or other factors.