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Variable Interest Entities - Royalty Trusts - Open Oil and Natural Gas Commodity Derivative Contracts (Details) - Jun. 30, 2015 - July 2015 - December 2015
$ / Mcf
$ / bbl
MBbls
MMcf
Oil Price Swaps  
Derivative Instruments and Hedging Activities Disclosure  
Notional (Oil in MBbls/Natural Gas in MMcf) | MBbls 1,570
Weighted Avg. Fixed Price (Oil in USD/bbl, Natural Gas in USD/mcf) | $ / bbl 93.02
Natural Gas Collars  
Derivative Instruments and Hedging Activities Disclosure  
Notional (Oil in MBbls/Natural Gas in MMcf) | MMcf 509
Collar Range, minimum 4.00
Collar Range, maximum 8.55
Royalty Trusts | Oil Price Swaps  
Derivative Instruments and Hedging Activities Disclosure  
Notional (Oil in MBbls/Natural Gas in MMcf) | MBbls 374
Weighted Avg. Fixed Price (Oil in USD/bbl, Natural Gas in USD/mcf) | $ / bbl 97.09
Royalty Trusts | Natural Gas Collars  
Derivative Instruments and Hedging Activities Disclosure  
Notional (Oil in MBbls/Natural Gas in MMcf) | MMcf 509
Collar Range, minimum 4.00
Collar Range, maximum 8.55