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Asset Impairments and Mine Closure Costs	3 Months Ended
Asset Impairments and Mine Closure Costs	Mar. 31, 2016
Discontinued Operations and Disposal Groups [Abstract]
Asset Impairment and Mine Closure Costs	Asset Impairment and Mine Closure Costs During the first quarter of 2016, the company recorded $85.5 million of "Asset impairment and mine closure costs" in the Condensed Consolidated Statements of Operations. The amount includes the following: a $74.1 million impairment of coal reserves and surface land in Kentucky that are being leased to a mining company that announced plans to idle its current mining operations related to those reserves during the quarter; $5.1 million of severance expense related to headcount reductions at Company operations; $3.4 million related to an impairment charge on the portion of an advance royalty balance on a reserve base mined at the Company's Mountain Laurel operation that will not be recouped; and $2.9 million related to an other-than-temporary-impairment charge on an available-for-sale security.