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Variable Interest Entities - Royalty Trusts - Open Oil and Natural Gas Commodity Derivative Contracts (Details)
3 Months Ended
Mar. 31, 2014
MBbls
Oil Price Swaps | April 2014 - December 2014
 
Derivative Instruments and Hedging Activities Disclosure  
Notional (Oil in MBbls/Natural Gas in MMcf) 2,936
Weighted Avg. Fixed Price (Oil in USD/bbl, Natural Gas in USD/mcf) 99.45
Oil Price Swaps | January 2015 - December 2015
 
Derivative Instruments and Hedging Activities Disclosure  
Notional (Oil in MBbls/Natural Gas in MMcf) 5,314
Weighted Avg. Fixed Price (Oil in USD/bbl, Natural Gas in USD/mcf) 92.55
Natural Gas Collars | April 2014 - December 2014
 
Derivative Instruments and Hedging Activities Disclosure  
Notional (Oil in MBbls/Natural Gas in MMcf) 706
Collar Range, minimum 4.00
Collar Range, maximum 7.78
Natural Gas Collars | January 2015 - December 2015
 
Derivative Instruments and Hedging Activities Disclosure  
Notional (Oil in MBbls/Natural Gas in MMcf) 1,010
Collar Range, minimum 4.00
Collar Range, maximum 8.55
Royalty Trusts | Oil Price Swaps | April 2014 - December 2014
 
Derivative Instruments and Hedging Activities Disclosure  
Notional (Oil in MBbls/Natural Gas in MMcf) 1,426
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 Disclosure  
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 | Natural Gas Collars | April 2014 - December 2014
 
Derivative Instruments and Hedging Activities Disclosure  
Notional (Oil in MBbls/Natural Gas in MMcf) 706
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  
Notional (Oil in MBbls/Natural Gas in MMcf) 1,010
Collar Range, minimum 4.00
Collar Range, maximum 8.55
Novated Contract | Royalty Trusts | Oil Price Swaps | April 2014 - December 2014
 
Derivative Instruments and Hedging Activities Disclosure  
Notional (Oil in MBbls/Natural Gas in MMcf) 722
Weighted Avg. Fixed Price (Oil in USD/bbl, Natural Gas in USD/mcf) 100.78
Novated Contract | Royalty Trusts | Oil Price Swaps | January 2015 - March 2015
 
Derivative Instruments and Hedging Activities Disclosure  
Notional (Oil in MBbls/Natural Gas in MMcf) 141
Weighted Avg. Fixed Price (Oil in USD/bbl, Natural Gas in USD/mcf) 100.90