Quarterly report pursuant to Section 13 or 15(d)

Derivative Financial Instruments - Open Commodity Derivatives (Details)

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Derivative Financial Instruments - Open Commodity Derivatives (Details) - 2016: 4th Quarter
 9 Months Ended
Sep. 30, 2016
MMBTU
$ / Derivative
bbl
NYMEX Crude Oil - Two-Way Collars  
Derivatives Fair Value [Line Items]  
Termination Period 4th Quarter
Notional Quantity (Bbls/day) | bbl 5,000 [1]
Notional Quantity (Bbls) | bbl 460,000 [1]
NYMEX Crude Oil - Two-Way Collars | Put Option | Bought  
Derivatives Fair Value [Line Items]  
Weighted Average Contract Price 40.00
NYMEX Crude Oil - Two-Way Collars | Call Option | Sold  
Derivatives Fair Value [Line Items]  
Weighted Average Contract Price 81.47
NYMEX Natural Gas - Three-Way Collars  
Derivatives Fair Value [Line Items]  
Termination Period 4th Quarter [2]
Notional Quantity (MMBTUs/day) | MMBTU 40,000 [1],[2]
Notional Quantity (MMBTUs) | MMBTU 2,440,000 [1],[2]
NYMEX Natural Gas - Three-Way Collars | Put Option | Bought  
Derivatives Fair Value [Line Items]  
Weighted Average Contract Price 2.25 [2]
NYMEX Natural Gas - Three-Way Collars | Call Option | Bought  
Derivatives Fair Value [Line Items]  
Weighted Average Contract Price 3.77 [2]
NYMEX Natural Gas - Three-Way Collars | Call Option | Sold  
Derivatives Fair Value [Line Items]  
Weighted Average Contract Price 3.50 [2]
[1] Volume Measurements: Bbls – barrelsMMBTUs – million British Thermal Units.
[2] The natural gas derivative contracts are priced and closed in the last week prior to the related production month. Natural gas derivative contracts related to October 2016 production were priced and closed in September 2016 and are not included in the above table as these were not open derivative contracts as of September 30, 2016.