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)
 9 Months Ended
Sep. 30, 2017
MMBTU
$ / Derivative
bbl
NYMEX Crude Oil - Swap  
Derivatives Fair Value [Line Items]  
Termination Period 4th Quarter
Notional Quantity (Bbls/day) | bbl 1,000 [1]
Notional Quantity (Bbls) | bbl 92,000 [1]
Strike Price 55.25
NYMEX Crude Oil - Two-Way Collars  
Derivatives Fair Value [Line Items]  
Termination Period 4th Quarter
Notional Quantity (Bbls/day) | bbl 4,000 [1]
Notional Quantity (Bbls) | bbl 368,000 [1]
NYMEX Crude Oil - Two-Way Collars | Put Option | Bought  
Derivatives Fair Value [Line Items]  
Weighted Average Contract Price 50.00
NYMEX Crude Oil - Two-Way Collars | Call Option | Sold  
Derivatives Fair Value [Line Items]  
Weighted Average Contract Price 60.15
NYMEX Natural Gas - Two-Way Collars  
Derivatives Fair Value [Line Items]  
Termination Period 4th Quarter (2) [2]
Notional Quantity (MMBtu's/day) | MMBTU 30,000 [1]
Notional Quantity (MMBtu's) | MMBTU 1,830,000 [1]
NYMEX Natural Gas - Two-Way Collars | Put Option | Bought  
Derivatives Fair Value [Line Items]  
Weighted Average Contract Price 3.07
NYMEX Natural Gas - Two-Way Collars | Call Option | Sold  
Derivatives Fair Value [Line Items]  
Weighted Average Contract Price 3.96
[1] Volume Measurements: Bbls – barrelsMMBtu’s – 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 2017 production were priced and closed in September 2017 and are not included in the above table as these were not open derivative contracts as of September 30, 2017.