Related Party Transactions	12 Months Ended
Related Party Transactions	Dec. 31, 2014
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions The Company owns a 50% interest in Black Warrior Methane ("BWM"), which is accounted for under the proportionate consolidation method. The Company has granted the rights to produce and sell methane gas from its coal mines to BWM. The Company also supplies labor to BWM and incurs costs, including property and liability insurance, to support the joint venture. The Company charges the joint venture for such costs on a monthly basis. These charges for 2014, 2013 and 2012 were $1.8 million, $1.9 million and $2.4 million, respectively. In connection with the acquisition of Western Coal Corp., the Company acquired a 50% interest in the Belcourt Saxon Coal Limited Partnership ("Belcourt Saxon"). Belcourt Saxon owns two multi-deposit coal properties which are located approximately 40 to 80 miles south of the Wolverine Mine in Northeast British Columbia. The joint venture was formed for the future exploration and development of surface coal mines. Belcourt Saxon is accounted for under the proportionate consolidation method. Costs associated with the joint venture were insignificant for 2014, 2013 and 2012. No field work was conducted on the Belcourt Saxon properties during 2014, other than maintenance of environmental monitoring stations.

The entire disclosure for related party transactions. Examples of related party transactions include transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners; and (d) affiliates.

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