Income Taxes	6 Months Ended
Jun. 30, 2017
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes Our effective tax rate from continuing operations was 146 percent in second quarter 2017 and 57 percent for first six months 2017. Our effective tax rate from continuing operations for second quarter 2017 exceeded the statutory rate due to a change in our valuation allowance due to current period transaction costs (termination fee and other costs) associated with the proposed D.R. Horton Merger. In addition, our effective tax rate from continuing operations for first six months 2017 exceeded the statutory rate due to goodwill impairment associated with our first quarter 2017 sale of owned mineral assets and a benefit from a valuation allowance decrease due to net decreases in our deferred tax assets. Our effective tax rate from continuing operations was 55 percent in second quarter 2016 and 51 percent for first six months 2016, which included an 18 percent detriment from a valuation allowance increase due to net increases in our deferred tax assets. In addition, 2017 and 2016 effective tax rates from continuing operations include the effect of state income taxes, nondeductible items and benefits of percentage depletion. At second quarter-end 2017 and year-end 2016, we have a valuation allowance for our deferred tax assets of $73,867,000 and $73,405,000 for the portion of the deferred tax assets that we have determined is more likely than not to be unrealizable under U.S. GAAP. 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 assets under U.S. GAAP. A significant piece of objective evidence evaluated was the cumulative loss incurred over the three-year period ended June 30, 2017, principally driven by impairments of oil and gas and real estate properties in prior years. 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. Our unrecognized tax benefits totaled approximately $1,500,000 at second quarter-end 2017, all of which would affect our effective tax rate, if recognized.

Income Taxes

Our effective tax rate from continuing operations was 146 percent in second quarter 2017 and 57 percent for first six months 2017. Our effective tax rate from continuing operations for second quarter 2017 exceeded the statutory rate due to a change in our valuation allowance due to current period transaction costs (termination fee and other costs) associated with the proposed D.R. Horton Merger. In addition, our effective tax rate from continuing operations for first six months 2017 exceeded the statutory rate due to goodwill impairment associated with our first quarter 2017 sale of owned mineral assets and a benefit from a valuation allowance decrease due to net decreases in our deferred tax assets.

Our effective tax rate from continuing operations was 55 percent in second quarter 2016 and 51 percent for first six months 2016, which included an 18 percent detriment from a valuation allowance increase due to net increases in our deferred tax assets. In addition, 2017 and 2016 effective tax rates from continuing operations include the effect of state income taxes, nondeductible items and benefits of percentage depletion.

At second quarter-end 2017 and year-end 2016, we have a valuation allowance for our deferred tax assets of $73,867,000 and $73,405,000 for the portion of the deferred tax assets that we have determined is more likely than not to be unrealizable under U.S. GAAP.

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 assets under U.S. GAAP. A significant piece of objective evidence evaluated was the cumulative loss incurred over the three-year period ended June 30, 2017, principally driven by impairments of oil and gas and real estate properties in prior years. 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.

Our unrecognized tax benefits totaled approximately $1,500,000 at second quarter-end 2017, all of which would affect our effective tax rate, if recognized.