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Variable Interest Entities - Royalty Trusts - Open Oil and Natural Gas Commodity Derivative Contracts (Details)	Mar. 31, 2013 MBbls
Oil | Price Swap | April 2013 - December 2013
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Notional (Oil in MBbls/Natural Gas in MMcf)	10,142
Weighted Avg. Fixed Price (Oil in USD/bbl, Natural Gas in USD/mcf)	98.64
Oil | Price Swap | January 2014 - December 2014
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Notional (Oil in MBbls/Natural Gas in MMcf)	7,511
Weighted Avg. Fixed Price (Oil in USD/bbl, Natural Gas in USD/mcf)	92.43
Oil | Price Swap | January 2015 - December 2015
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Notional (Oil in MBbls/Natural Gas in MMcf)	5,076
Weighted Avg. Fixed Price (Oil in USD/bbl, Natural Gas in USD/mcf)	83.69
Natural Gas | Price Swap | April 2013 - December 2013
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Notional (Oil in MBbls/Natural Gas in MMcf)	31,005
Weighted Avg. Fixed Price (Oil in USD/bbl, Natural Gas in USD/mcf)	4.01
Natural Gas | Collars | April 2013 - December 2013
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Notional (Oil in MBbls/Natural Gas in MMcf)	5,146
Collar Range, minimum	3.78
Collar Range, maximum	6.71
Natural Gas | Collars | January 2014 - December 2014
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Notional (Oil in MBbls/Natural Gas in MMcf)	937
Collar Range, minimum	4.00
Collar Range, maximum	7.78
Natural Gas | Collars | January 2015 - December 2015
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Notional (Oil in MBbls/Natural Gas in MMcf)	1,010
Collar Range, minimum	4.00
Collar Range, maximum	8.55
Royalty Trusts | Oil | Price Swap | April 2013 - December 2013
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Notional (Oil in MBbls/Natural Gas in MMcf)	1,137
Weighted Avg. Fixed Price (Oil in USD/bbl, Natural Gas in USD/mcf)	103.03
Royalty Trusts | Oil | Price Swap | January 2014 - December 2014
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Notional (Oil in MBbls/Natural Gas in MMcf)	1,862
Weighted Avg. Fixed Price (Oil in USD/bbl, Natural Gas in USD/mcf)	100.70
Royalty Trusts | Oil | Price Swap | January 2015 - December 2015
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Notional (Oil in MBbls/Natural Gas in MMcf)	630
Weighted Avg. Fixed Price (Oil in USD/bbl, Natural Gas in USD/mcf)	101.03
Royalty Trusts | Oil | Price Swap | Novated | April 2013 - December 2013
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Notional (Oil in MBbls/Natural Gas in MMcf)	999
Weighted Avg. Fixed Price (Oil in USD/bbl, Natural Gas in USD/mcf)	103.27
Royalty Trusts | Oil | Price Swap | Novated | January 2014 - December 2014
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Notional (Oil in MBbls/Natural Gas in MMcf)	991
Weighted Avg. Fixed Price (Oil in USD/bbl, Natural Gas in USD/mcf)	100.79
Royalty Trusts | Oil | Price Swap | Novated | January 2015 - March 2015
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Notional (Oil in MBbls/Natural Gas in MMcf)	141
Weighted Avg. Fixed Price (Oil in USD/bbl, Natural Gas in USD/mcf)	100.90
Royalty Trusts | Natural Gas | Collars | April 2013 - December 2013
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Notional (Oil in MBbls/Natural Gas in MMcf)	646
Collar Range, minimum	4.00
Collar Range, maximum	7.15
Royalty Trusts | Natural Gas | Collars | January 2014 - December 2014
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Notional (Oil in MBbls/Natural Gas in MMcf)	937
Collar Range, minimum	4.00
Collar Range, maximum	7.78
Royalty Trusts | Natural Gas | Collars | January 2015 - December 2015
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Notional (Oil in MBbls/Natural Gas in MMcf)	1,010
Collar Range, minimum	4.00
Collar Range, maximum	8.55

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Nominal volume used to calculate payments on a derivative instrument.

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

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