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Variable Interest Entities - Royalty Trusts - Ownership Interest (Details)	Mar. 31, 2013 Mississippian Trust I	Dec. 31, 2012 Mississippian Trust I	Apr. 30, 2011 Mississippian Trust I		Mar. 31, 2013 Permian Trust	Dec. 31, 2012 Permian Trust	Aug. 31, 2011 Permian Trust		Mar. 31, 2013 Mississippian Trust II	Dec. 31, 2012 Mississippian Trust II	Apr. 30, 2012 Mississippian Trust II
Variable Interest Entity [Line Items]
Beneficial interest owned by Company	26.90%	26.90%	38.40%	[1]	30.50%	30.50%	34.30%	[1]	39.90%	39.90%	39.90%	[1]
[1] Subsequent to the initial public offerings, the Company sold common units of the Mississippian Trust I and the Permian Trust it owned in transactions exempt from registration under Rule 144 under the Securities Act. These transactions decreased the Company’s beneficial interests in the Royalty Trusts. See further discussion of the unit sales below.

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