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Other Commercial Events	6 Months Ended
Other Commercial Events	Jun. 30, 2011
Other Commercial Events [Abstract]
Other Commercial Events	(11) Other Commercial Events In June 2011, the Company exchanged coal reserves in Kentucky and coal reserves and surface lands in Illinois for coal reserves in West Virginia. Based on the fair value of the coal reserves received, the Company recognized a $23.5 million gain on the exchange. Fair value was determined by using a discounted cash flows model that included assumptions for future coal sales prices, operating costs and discount rate. This non-cash transaction was excluded from the investing section of the unaudited condensed consolidated statement of cash flows. In June 2011, the Company recognized income associated with the receipt of a $14.6 million project development fee related to its involvement in the Prairie State Energy Campus (Prairie State), a 1,600 megawatt coal-fueled electricity generation project currently under construction.