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Variable Interest Entities - Royalty Trusts - Ownership Interest (Details) | Dec. 31, 2013 Mississippian Trust I | Dec. 31, 2012 Mississippian Trust I | Apr. 30, 2011 Mississippian Trust I | Dec. 31, 2013 Permian Trust | Dec. 31, 2012 Permian Trust | Aug. 31, 2011 Permian Trust | Dec. 31, 2013 Mississippian Trust II | Dec. 31, 2012 Mississippian Trust II | Apr. 30, 2012 Mississippian Trust II
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Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Beneficial interest owned by Company | 26.90% | 26.90% | 38.40% | [1] | 28.50% | 30.50% | 34.30% | [1] | 37.60% | 39.90% | 39.90% | [1]
[1] | Subsequent to the initial public offerings, the Company sold common units of the Royalty Trusts 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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