Income Taxes	9 Months Ended
Sep. 30, 2015
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes During the first nine months of 2015, the Company determined it was more likely than not that the federal and state net operating losses it expects to generate in 2015 will not be realized based on projections of future taxable income. Accordingly, the estimated annual effective rate for the year ended December 31, 2015 includes the impact of recording a valuation allowance against these attributes. During the nine months ended September 30, 2015, the Company realized a net tax benefit of $351.3 million, which included a $794.0 million tax benefit associated with the asset impairment charges partially offset by a valuation allowance of $426.4 million for federal net operating losses and tax credits and $19.3 million for the state net operating losses. During the first nine months of 2014, the Company increased its valuation allowance for the portion of the federal and state net operating losses it expected to generate in 2014. The Company increased its valuation allowance by $51.7 million for the federal net operating losses and $6.3 million for the state net operating losses.

Income Taxes

9 Months Ended

Sep. 30, 2015

During the first nine months of 2015, the Company determined it was more likely than not that the federal and state net operating losses it expects to generate in 2015 will not be realized based on projections of future taxable income. Accordingly, the estimated annual effective rate for the year ended December 31, 2015 includes the impact of recording a valuation allowance against these attributes. During the nine months ended September 30, 2015, the Company realized a net tax benefit of $351.3 million, which included a $794.0 million tax benefit associated with the asset impairment charges partially offset by a valuation allowance of $426.4 million for federal net operating losses and tax credits and $19.3 million for the state net operating losses.

During the first nine months of 2014, the Company increased its valuation allowance for the portion of the federal and state net operating losses it expected to generate in 2014. The Company increased its valuation allowance by $51.7 million for the federal net operating losses and $6.3 million for the state net operating losses.