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Subsequent Events (Tables) | 3 Months Ended
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Mar. 31, 2013
Subsequent Events [Abstract] |
Royalty Trust Distributions | The following distributions are expected to be paid on May 30, 2013 to holders of record as of the close of business on May 15, 2013 (in thousands):
Royalty Trust |  | Total Distribution |  | Amount to be Distributed to Third-Party Unitholders
Mississippian Trust I |  | $ | 15,909 |  |  | $ | 12,087 |
Permian Trust |  | 24,787 |  |  | 18,688 |
Mississippian Trust II |  | 27,761 |  |  | 16,693 |
Total |  | $ | 68,457 |  |  | $ | 47,468 |

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- Definition Royalty Trust Distributions [Table Text Block] + References No definition available. + Details
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