Income Taxes	6 Months Ended
Jun. 30, 2016
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes Our effective tax rate from continuing operations was 55 percent in second quarter 2016 and 51 percent for the first six months 2016, which includes an 18 percent detriment for an increase in our valuation allowance which was recorded to offset current year increases in our deferred tax asset. Our effective tax rate from continuing operations was 25 percent in second quarter 2015 and 40 percent in first six months 2015, which included a four percent benefit for noncontrolling interests and a seven percent detriment for share-based compensation benefits that will not be realized. In addition, 2016 and 2015 effective tax rates from continuing operations include the effect of state income taxes, nondeductible items and benefits of percentage depletion. At second quarter-end 2016 and year-end 2015, we had a valuation allowance for our deferred tax assets of $97,041,000 and $97,068,000 for the portion of the deferred tax assets that we have determined is more likely than not to be unrealizable. In determining our valuation allowance, we assessed available positive and negative evidence to estimate whether sufficient future taxable income will be generated to permit use of the existing deferred tax asset. A significant piece of objective evidence evaluated was the cumulative loss incurred over the three-year period ended June 30, 2016, principally driven by impairments of oil and gas properties in 2015. Such evidence limits our ability to consider other subjective evidence, such as our projected future taxable income. The amount of the deferred tax asset considered realizable could be adjusted if negative evidence in the form of cumulative losses is no longer present and additional weight is given to subjective evidence, such as our projected future taxable income.

Income Taxes

6 Months Ended

Jun. 30, 2016

Our effective tax rate from continuing operations was 55 percent in second quarter 2016 and 51 percent for the first six months 2016, which includes an 18 percent detriment for an increase in our valuation allowance which was recorded to offset current year increases in our deferred tax asset. Our effective tax rate from continuing operations was 25 percent in second quarter 2015 and 40 percent in first six months 2015, which included a four percent benefit for noncontrolling interests and a seven percent detriment for share-based compensation benefits that will not be realized. In addition, 2016 and 2015 effective tax rates from continuing operations include the effect of state income taxes, nondeductible items and benefits of percentage depletion.

At second quarter-end 2016 and year-end 2015, we had a valuation allowance for our deferred tax assets of $97,041,000 and $97,068,000 for the portion of the deferred tax assets that we have determined is more likely than not to be unrealizable.

In determining our valuation allowance, we assessed available positive and negative evidence to estimate whether sufficient future taxable income will be generated to permit use of the existing deferred tax asset. A significant piece of objective evidence evaluated was the cumulative loss incurred over the three-year period ended June 30, 2016, principally driven by impairments of oil and gas properties in 2015. Such evidence limits our ability to consider other subjective evidence, such as our projected future taxable income.

The amount of the deferred tax asset considered realizable could be adjusted if negative evidence in the form of cumulative losses is no longer present and additional weight is given to subjective evidence, such as our projected future taxable income.