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Variable Interest Entities - Royalty Trusts - Initial Public Offering (Details) (USD $) In Millions, except Share data, unless otherwise specified | 1 Months Ended |  |  | 1 Months Ended |  |  | 1 Months Ended |  |
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Apr. 30, 2011 Mississippian Trust I | Mar. 31, 2013 Mississippian Trust I | Dec. 31, 2012 Mississippian Trust I | Aug. 31, 2011 Permian Trust | Mar. 31, 2013 Permian Trust | Dec. 31, 2012 Permian Trust | Apr. 30, 2012 Mississippian Trust II | Mar. 31, 2013 Mississippian Trust II | Dec. 31, 2012 Mississippian Trust II
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds of offering | $ 336.9 |  |  |  | $ 580.6 |  |  |  | $ 587.1 |  |  |
Total outstanding common units (in shares) | 21,000,000 |  |  |  | 39,375,000 |  |  |  | 37,293,750 |  |  |
Total outstanding subordinated units (in shares) | 7,000,000 |  |  |  | 13,125,000 |  |  |  | 12,431,250 |  |  |
Beneficial interest owned by Company | 38.40% | [1] | 26.90% | 26.90% | 34.30% | [1] | 30.50% | 30.50% | 39.90% | [1] | 39.90% | 39.90%
Liquidation date | Dec. 31, 2030 | [2] |  |  | Mar. 31, 2031 | [2] |  |  | Dec. 31, 2031 | [2] |  |
[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.
[2] | At the time each Royalty Trust terminates, 50% of the royalty interests conveyed to the Royalty Trust will automatically revert to the Company, and the remaining 50% will be sold with the proceeds distributed to Royalty Trust unitholders.

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