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Supplemental Information on Oil and Natural Gas Producing Activities - Calculation of Weighted Average Per Unit Prices (Unaudited) (Details)
 12 Months Ended
Dec. 31, 2015
$ / Mcf
$ / bbl
Dec. 31, 2014
$ / Mcf
$ / bbl
Dec. 31, 2013
$ / Mcf
$ / bbl
Oil Reserves      
Average Sales Price and Production Costs Per Unit of Production [Line Items]      
Weighted Average Sales Price (USD per barrel for Oil and NGLs/USD per Mcf for Natural Gas) 45.29 91.65 95.67
Natural Gas Liquids      
Average Sales Price and Production Costs Per Unit of Production [Line Items]      
Weighted Average Sales Price (USD per barrel for Oil and NGLs/USD per Mcf for Natural Gas) 12.68 32.79 31.40
Natural Gas      
Average Sales Price and Production Costs Per Unit of Production [Line Items]      
Weighted Average Sales Price (USD per barrel for Oil and NGLs/USD per Mcf for Natural Gas) | $ / Mcf 1.87 3.61 3.65