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Business Combination	3 Months Ended
Business Combination	Mar. 31, 2012
Business Combination [Abstract]
Business Combination	3. Business Combination On June 15, 2011, the Company completed its acquisition of ICG, a leading coal producer. During the first quarter of 2012, the Company finalized the determination of the fair values of the assets acquired and liabilities assumed in the acquisition, with no material adjustments to what was recorded as of December 31, 2011.

The entire disclosure for a business combination (or series of individually immaterial business combinations) completed during the period, including background, timing, and recognized assets and liabilities. The disclosure may include leverage buyout transactions (as applicable).

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