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Settlement with Patriot Coal	12 Months Ended
Settlement with Patriot Coal	Dec. 31, 2014
Settlement with Patriot Coal [Abstract]
Settlement with Patriot Coal	Settlement with Patriot Coal On December 31, 2005, Arch entered into a purchase and sale agreement to sell mining complexes to Magnum Coal Company ("Magnum"). On July 23, 2008, Patriot Coal Corporation acquired Magnum from Arc Light Capital Partners. On July 9, 2012, Patriot Coal Corporation and certain of its wholly owned subsidiaries, including Magnum, (collectively, "Patriot") filed voluntary petitions for reorganization under Chapter 11 of the U.S. Code in the U.S. Bankruptcy Court for the Southern District of New York. On October 4, 2013, we entered into a term sheet that was approved by the U.S. Bankruptcy Court on November 7, 2013, that resolves all pending and potential legal claims with Patriot stemming from the Company's sale of mining complexes to Magnum and the subsequent purchase of those companies by Patriot in 2008. The Company paid $5.0 million in cash to Patriot upon its exit from bankruptcy, which is reflected in "Other operating income, net" in the consolidated statement of operations for the year ended December 31, 2013.