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Variable Interest Entities - Royalty Trusts - Open Oil and Natural Gas Commodity Derivative Contracts (Details) | Mar. 31, 2013 MBbls
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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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