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Variable Interest Entities - Royalty Trusts - Open Oil and Natural Gas Commodity Derivative Contracts (Details) - October 2015 - December 2015	9 Months Ended
	Sep. 30, 2015 $ / Mcf $ / bbl MBbls MMcf
Oil Price Swaps
Derivative Instruments and Hedging Activities Disclosure
Notional (Oil in MBbls/Natural Gas in MMcf) | MBbls	555
Weighted Avg. Fixed Price (Oil in USD/bbl, Natural Gas in USD/mcf) | $ / bbl	94.11
Natural Gas Collars
Derivative Instruments and Hedging Activities Disclosure
Notional (Oil in MBbls/Natural Gas in MMcf) | MMcf	255
Collar Range, minimum (in usd per mcf)	4.00
Collar Range, maximumCollar Range, minimum (in usd per mcf)	8.55
Royalty Trusts | Oil Price Swaps
Derivative Instruments and Hedging Activities Disclosure
Notional (Oil in MBbls/Natural Gas in MMcf) | MBbls	187
Weighted Avg. Fixed Price (Oil in USD/bbl, Natural Gas in USD/mcf) | $ / bbl	97.09
Royalty Trusts | Natural Gas Collars
Derivative Instruments and Hedging Activities Disclosure
Notional (Oil in MBbls/Natural Gas in MMcf) | MMcf	255
Collar Range, minimum (in usd per mcf)	4.00
Collar Range, maximumCollar Range, minimum (in usd per mcf)	8.55

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- Definition

Derivative Instruments and Hedging Activities Disclosure [Line Items]

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The cap rate on a price risk derivative such as a cap or collar. A payment or receipt is triggered if the market rate exceeds the cap rate on the contract.

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- Definition

Floor rate on a price risk derivative such as a floor or a collar. A payment or receipt is triggered if the market rate falls below the floor rate on the contract.

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Nominal volume used to calculate payments on a derivative instrument.

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- Definition

Average fixed price related to the group of price risk swap derivatives.

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