Income Taxes	3 Months Ended
Mar. 31, 2016
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes As a result of the significant declines in commodity prices and the resulting ceiling test write-downs and net losses incurred, we determined during 2015 that it was more likely than not that a portion of our deferred tax assets will not be realized in the future. Accordingly, we established a valuation allowance against a portion of our deferred tax assets. As of March 31, 2016, our valuation allowance totaled $245.5 million. Our effective tax rate for the three months ended March 31, 2016 was 1.0%. This percentage differed from the federal statutory rate of 35.0% primarily due to the establishment of valuation allowances against deferred tax assets. Our assessment of the realizability of our deferred tax assets is based on the weight of all available evidence, both positive and negative, including future reversals of deferred tax liabilities. We had a current income tax receivable of $46.2 million at March 31, 2016, which relates to expected tax refunds from the carryback of net operating losses to previous tax years.

Income Taxes

3 Months Ended

Mar. 31, 2016

As a result of the significant declines in commodity prices and the resulting ceiling test write-downs and net losses incurred, we determined during 2015 that it was more likely than not that a portion of our deferred tax assets will not be realized in the future. Accordingly, we established a valuation allowance against a portion of our deferred tax assets. As of March 31, 2016, our valuation allowance totaled $245.5 million. Our effective tax rate for the three months ended March 31, 2016 was 1.0%. This percentage differed from the federal statutory rate of 35.0% primarily due to the establishment of valuation allowances against deferred tax assets. Our assessment of the realizability of our deferred tax assets is based on the weight of all available evidence, both positive and negative, including future reversals of deferred tax liabilities. We had a current income tax receivable of $46.2 million at March 31, 2016, which relates to expected tax refunds from the carryback of net operating losses to previous tax years.