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Variable Interest Entities - Royalty Trusts - Ownership Interest (Details) | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Mississippian Trust I |  |
Variable Interest Entity |  |
Beneficial interest owned by Company | 26.90% | 26.90%
Permian Trust |  |
Variable Interest Entity |  |
Beneficial interest owned by Company | 25.00% | 25.00%
Mississippian Trust II |  |
Variable Interest Entity |  |
Beneficial interest owned by Company | 37.60% | 37.60%

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- Definition Variable Interest Entity, Ownership Interests Percentage + References No definition available. + Details
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Data Type: | num:percentItemType
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Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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Namespace Prefix: |
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Balance Type: |
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Balance Type: |
Period Type: |