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Subsequent Events	3 Months Ended
Subsequent Events	Mar. 31, 2014
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events During the fourth quarter of 2013, NACoal acquired the equipment of National Coal of Alabama, Inc. ("NCOA") in exchange for the assumption of outstanding debt of $9.7 million associated with the acquired equipment. The outstanding debt was repaid concurrently with the acquisition of equipment utilizing borrowings under NACoal's existing unsecured revolving line of credit. In April 2014, NACoal acquired coal reserves and prepaid royalties and assumed certain reclamation obligations of NCOA. No cash payment was made to NCOA. This acquisition, which will be accounted for as a business combination, provides additional coal reserves in Alabama and equipment that can be used at NACoal's Reed Minerals mine, also located in Alabama.