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Asset Impairment and Mine Closure Costs	6 Months Ended
Asset Impairment and Mine Closure Costs	Jun. 30, 2015
Restructuring and Related Activities [Abstract]
Asset Impairment and Mine Closure Costs	Asset Impairment and Mine Closure Costs During the second quarter of 2015, the Company recorded $19.1 million to "Asset impairment and mine closure costs" in the Condensed Consolidated Statements of Operations. An impairment charge of $12.2 million relates to the portion of an advance royalty balance on a reserve base mined at the Company's Mountain Laurel, Spruce and Briar Branch operations that will not be recouped based on latest estimates of sales volumes and pricing through the recoupment period which runs through March 2017. Additionally, the Company recorded a $5.6 million impairment charge related to the closure of a higher cost mining complex, Cumberland River, serving the metallurgical coal markets.