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Variable Interest Entities - Royalty Trusts - Open Oil and Natural Gas Commodity Derivative Contracts (Details)	Dec. 31, 2012 MMcf
Natural Gas \| Collars \| January 2013 - December 2013
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Notional (Oil in MBbl/Natural Gas in MMcf)	6,858
Floor rate	3.78
Cap rate	6.71
Natural Gas \| Collars \| January 2014 - December 2014
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Notional (Oil in MBbl/Natural Gas in MMcf)	937
Floor rate	4.00
Cap rate	7.78
Natural Gas \| Collars \| January 2015 - December 2015
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Notional (Oil in MBbl/Natural Gas in MMcf)	1,010
Floor rate	4.00
Cap rate	8.55
Royalty Trusts \| Oil \| Swap \| January 2013 - December 2013
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Notional (Oil in MBbl/Natural Gas in MMcf)	1,814
Weighted Avg. Fixed Price (Oil in USD/bbl, Natural Gas in USD/mcf)	103.03
Royalty Trusts \| Oil \| Swap \| January 2014 - December 2014
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Notional (Oil in MBbl/Natural Gas in MMcf)	2,053
Weighted Avg. Fixed Price (Oil in USD/bbl, Natural Gas in USD/mcf)	100.78
Royalty Trusts \| Oil \| Swap \| January 2015 - December 2015
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Notional (Oil in MBbl/Natural Gas in MMcf)	667
Weighted Avg. Fixed Price (Oil in USD/bbl, Natural Gas in USD/mcf)	101.02
Royalty Trusts \| Oil \| Swap \| Novated \| January 2013 - December 2013
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Notional (Oil in MBbl/Natural Gas in MMcf)	1,021
Weighted Avg. Fixed Price (Oil in USD/bbl, Natural Gas in USD/mcf)	103.35
Royalty Trusts \| Oil \| Swap \| Novated \| January 2014 - December 2014
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Notional (Oil in MBbl/Natural Gas in MMcf)	799
Weighted Avg. Fixed Price (Oil in USD/bbl, Natural Gas in USD/mcf)	100.59
Royalty Trusts \| Oil \| Swap \| Novated \| January 2015 - March 2015
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Notional (Oil in MBbl/Natural Gas in MMcf)	104
Weighted Avg. Fixed Price (Oil in USD/bbl, Natural Gas in USD/mcf)	100.90
Royalty Trusts \| Natural Gas \| Collars \| January 2013 - December 2013
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Notional (Oil in MBbl/Natural Gas in MMcf)	858
Floor rate	4.00
Cap rate	7.15
Royalty Trusts \| Natural Gas \| Collars \| January 2014 - December 2014
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Notional (Oil in MBbl/Natural Gas in MMcf)	937
Floor rate	4.00
Cap rate	7.78
Royalty Trusts \| Natural Gas \| Collars \| January 2015 - December 2015
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Notional (Oil in MBbl/Natural Gas in MMcf)	1,010
Floor rate	4.00
Cap rate	8.55