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Variable Interest Entities - Royalty Trusts - Ownership Interest (Details)	Jun. 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

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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.

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No definition available.

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- Details

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- Details

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