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Variable Interest Entities - Royalty Trusts - Open Oil and Natural Gas Commodity Derivative Contracts (Details) | 12 Months Ended
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Dec. 31, 2013 MBbls
Oil price swaps | January 2014 - December 2014 |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |
Notional (Oil in MBbl/Natural Gas in MMcf) | 8,813
Weighted Avg. Fixed Price (Oil in USD/bbl, Natural Gas in USD/mcf) | 92.98
Oil price swaps | January 2015 - December 2015 |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |
Notional (Oil in MBbl/Natural Gas in MMcf) | 7,979
Weighted Avg. Fixed Price (Oil in USD/bbl, Natural Gas in USD/mcf) | 86.13
Natural gas collars | January 2014 - December 2014 |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |
Notional (Oil in MBbl/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 Disclosures [Line Items] |
Notional (Oil in MBbl/Natural Gas in MMcf) | 1,010
Collar range, minimum | 4.00
Collar range, maximum | 8.55
Royalty Trusts | Oil price swaps | January 2014 - December 2014 |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |
Notional (Oil in MBbl/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 swaps | January 2015 - December 2015 |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |
Notional (Oil in MBbl/Natural Gas in MMcf) | 630
Weighted Avg. Fixed Price (Oil in USD/bbl, Natural Gas in USD/mcf) | 101.03
Royalty Trusts | Natural gas collars | January 2014 - December 2014 |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |
Notional (Oil in MBbl/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 Disclosures [Line Items] |
Notional (Oil in MBbl/Natural Gas in MMcf) | 1,010
Collar range, minimum | 4.00
Collar range, maximum | 8.55
Royalty Trusts | Novated Contract | Oil price swaps | January 2014 - December 2014 |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |
Notional (Oil in MBbl/Natural Gas in MMcf) | 991
Weighted Avg. Fixed Price (Oil in USD/bbl, Natural Gas in USD/mcf) | 100.79
Royalty Trusts | Novated Contract | Oil price swaps | January 2015 - March 2015 |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |
Notional (Oil in MBbl/Natural Gas in MMcf) | 141
Weighted Avg. Fixed Price (Oil in USD/bbl, Natural Gas in USD/mcf) | 100.90

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- Definition 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. + References No definition available. + Details
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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. + References No definition available. + Details
Name: | us-gaap_DerivativeFloorPrice
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- Details
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- Definition Nominal volume used to calculate payments on a derivative instrument. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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- Definition Average fixed price related to the group of price risk swap derivatives. + References No definition available. + Details
Name: | us-gaap_DerivativeSwapTypeAverageFixedPrice
Namespace Prefix: | us-gaap_
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