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Related Party Transactions (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Rio Tinto Energy America (RTEA) \| Rent
Related Party Transactions
Fee charged by Rio Tinto			$ 245
Rio Tinto Energy America (RTEA) \| Agency services
Related Party Transactions
Fee charged by Rio Tinto		712	245
Rio Tinto Energy America (RTEA) \| Export sales
Related Party Transactions
Revenue		16,203	8,569
Venture Fuels Partnership \| Coal sales
Related Party Transactions
Revenue	$ 22,069	$ 20,461	$ 27,674

Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

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