Quarterly report pursuant to Section 13 or 15(d)

Derivative Financial Instruments - Open Commodity Derivatives (Details)

v3.3.0.814
Derivative Financial Instruments - Open Commodity Derivatives (Details)
 6 Months Ended
Jun. 30, 2015
MMBTU
$ / Derivative
bbl
NYMEX Crude Oil - Three-Way Collars  
Derivatives Fair Value [Line Items]  
Notional Quantity (Bbls) | bbl 1,104,000
NYMEX Crude Oil - Three-Way Collars | Put Option | Bought  
Derivatives Fair Value [Line Items]  
Weighted Average Contract Price 50.00
NYMEX Crude Oil - Three-Way Collars | Call Option | Bought  
Derivatives Fair Value [Line Items]  
Weighted Average Contract Price 62.30
NYMEX Crude Oil - Three-Way Collars | Call Option | Sold  
Derivatives Fair Value [Line Items]  
Weighted Average Contract Price 60.00
NYMEX Crude Oil - Three-Way Collars | 2015: 3rd Quarter  
Derivatives Fair Value [Line Items]  
Termination Period 3rd Quarter
Notional Quantity (Bbls/day) | bbl 6,000
Notional Quantity (Bbls) | bbl 552,000
NYMEX Crude Oil - Three-Way Collars | 2015: 3rd Quarter | Put Option | Bought  
Derivatives Fair Value [Line Items]  
Weighted Average Contract Price 50.00
NYMEX Crude Oil - Three-Way Collars | 2015: 3rd Quarter | Call Option | Bought  
Derivatives Fair Value [Line Items]  
Weighted Average Contract Price 62.30
NYMEX Crude Oil - Three-Way Collars | 2015: 3rd Quarter | Call Option | Sold  
Derivatives Fair Value [Line Items]  
Weighted Average Contract Price 60.00
NYMEX Crude Oil - Three-Way Collars | 2015: 4th Quarter  
Derivatives Fair Value [Line Items]  
Termination Period 4th Quarter
Notional Quantity (Bbls/day) | bbl 6,000
Notional Quantity (Bbls) | bbl 552,000
NYMEX Crude Oil - Three-Way Collars | 2015: 4th Quarter | Put Option | Bought  
Derivatives Fair Value [Line Items]  
Weighted Average Contract Price 50.00
NYMEX Crude Oil - Three-Way Collars | 2015: 4th Quarter | Call Option | Bought  
Derivatives Fair Value [Line Items]  
Weighted Average Contract Price 62.30
NYMEX Crude Oil - Three-Way Collars | 2015: 4th Quarter | Call Option | Sold  
Derivatives Fair Value [Line Items]  
Weighted Average Contract Price 60.00
NYMEX Crude Oil - Two-Way Collars  
Derivatives Fair Value [Line Items]  
Notional Quantity (Bbls) | bbl 1,830,000
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 Crude Oil - Two-Way Collars | 2016: 1st Quarter  
Derivatives Fair Value [Line Items]  
Termination Period 1st Quarter
Notional Quantity (Bbls/day) | bbl 5,000
Notional Quantity (Bbls) | bbl 455,000
NYMEX Crude Oil - Two-Way Collars | 2016: 1st Quarter | Put Option | Bought  
Derivatives Fair Value [Line Items]  
Weighted Average Contract Price 40.00
NYMEX Crude Oil - Two-Way Collars | 2016: 1st Quarter | Call Option | Sold  
Derivatives Fair Value [Line Items]  
Weighted Average Contract Price 81.47
NYMEX Crude Oil - Two-Way Collars | 2016: 2nd Quarter  
Derivatives Fair Value [Line Items]  
Termination Period 2nd Quarter
Notional Quantity (Bbls/day) | bbl 5,000
Notional Quantity (Bbls) | bbl 455,000
NYMEX Crude Oil - Two-Way Collars | 2016: 2nd Quarter | Put Option | Bought  
Derivatives Fair Value [Line Items]  
Weighted Average Contract Price 40.00
NYMEX Crude Oil - Two-Way Collars | 2016: 2nd Quarter | Call Option | Sold  
Derivatives Fair Value [Line Items]  
Weighted Average Contract Price 81.47
NYMEX Crude Oil - Two-Way Collars | 2016: 3rd Quarter  
Derivatives Fair Value [Line Items]  
Termination Period 3rd Quarter
Notional Quantity (Bbls/day) | bbl 5,000
Notional Quantity (Bbls) | bbl 460,000
NYMEX Crude Oil - Two-Way Collars | 2016: 3rd Quarter | Put Option | Bought  
Derivatives Fair Value [Line Items]  
Weighted Average Contract Price 40.00
NYMEX Crude Oil - Two-Way Collars | 2016: 3rd Quarter | Call Option | Sold  
Derivatives Fair Value [Line Items]  
Weighted Average Contract Price 81.47
NYMEX Crude Oil - Two-Way Collars | 2016: 4th Quarter  
Derivatives Fair Value [Line Items]  
Termination Period 4th Quarter
Notional Quantity (Bbls/day) | bbl 5,000
Notional Quantity (Bbls) | bbl 460,000
NYMEX Crude Oil - Two-Way Collars | 2016: 4th Quarter | Put Option | Bought  
Derivatives Fair Value [Line Items]  
Weighted Average Contract Price 40.00
NYMEX Crude Oil - Two-Way Collars | 2016: 4th Quarter | 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]  
Notional Quantity (MMBTUs) | MMBTU 19,230,000 [1]
NYMEX Natural Gas - Three-Way Collars | Put Option | Bought  
Derivatives Fair Value [Line Items]  
Weighted Average Contract Price 2.25 [1]
NYMEX Natural Gas - Three-Way Collars | Call Option | Bought  
Derivatives Fair Value [Line Items]  
Weighted Average Contract Price 3.70 [1]
NYMEX Natural Gas - Three-Way Collars | Call Option | Sold  
Derivatives Fair Value [Line Items]  
Weighted Average Contract Price 3.44 [1]
NYMEX Natural Gas - Three-Way Collars | 2015: 3rd Quarter  
Derivatives Fair Value [Line Items]  
Termination Period 3rd Quarter [1]
Notional Quantity (MMBTUs/day) | MMBTU 30,000 [1]
Notional Quantity (MMBTUs) | MMBTU 1,830,000 [1]
NYMEX Natural Gas - Three-Way Collars | 2015: 3rd Quarter | Put Option | Bought  
Derivatives Fair Value [Line Items]  
Weighted Average Contract Price 2.25 [1]
NYMEX Natural Gas - Three-Way Collars | 2015: 3rd Quarter | Call Option | Bought  
Derivatives Fair Value [Line Items]  
Weighted Average Contract Price 3.51 [1]
NYMEX Natural Gas - Three-Way Collars | 2015: 3rd Quarter | Call Option | Sold  
Derivatives Fair Value [Line Items]  
Weighted Average Contract Price 3.25 [1]
NYMEX Natural Gas - Three-Way Collars | 2015: 4th Quarter  
Derivatives Fair Value [Line Items]  
Termination Period 4th Quarter [1]
Notional Quantity (MMBTUs/day) | MMBTU 30,000 [1]
Notional Quantity (MMBTUs) | MMBTU 2,760,000 [1]
NYMEX Natural Gas - Three-Way Collars | 2015: 4th Quarter | Put Option | Bought  
Derivatives Fair Value [Line Items]  
Weighted Average Contract Price 2.25 [1]
NYMEX Natural Gas - Three-Way Collars | 2015: 4th Quarter | Call Option | Bought  
Derivatives Fair Value [Line Items]  
Weighted Average Contract Price 3.51 [1]
NYMEX Natural Gas - Three-Way Collars | 2015: 4th Quarter | Call Option | Sold  
Derivatives Fair Value [Line Items]  
Weighted Average Contract Price 3.25 [1]
NYMEX Natural Gas - Three-Way Collars | 2016: 1st Quarter  
Derivatives Fair Value [Line Items]  
Termination Period 1st Quarter [1]
Notional Quantity (MMBTUs/day) | MMBTU 40,000 [1]
Notional Quantity (MMBTUs) | MMBTU 3,640,000 [1]
NYMEX Natural Gas - Three-Way Collars | 2016: 1st Quarter | Put Option | Bought  
Derivatives Fair Value [Line Items]  
Weighted Average Contract Price 2.25 [1]
NYMEX Natural Gas - Three-Way Collars | 2016: 1st Quarter | Call Option | Bought  
Derivatives Fair Value [Line Items]  
Weighted Average Contract Price 3.77 [1]
NYMEX Natural Gas - Three-Way Collars | 2016: 1st Quarter | Call Option | Sold  
Derivatives Fair Value [Line Items]  
Weighted Average Contract Price 3.50 [1]
NYMEX Natural Gas - Three-Way Collars | 2016: 2nd Quarter  
Derivatives Fair Value [Line Items]  
Termination Period 2nd Quarter [1]
Notional Quantity (MMBTUs/day) | MMBTU 40,000 [1]
Notional Quantity (MMBTUs) | MMBTU 3,640,000 [1]
NYMEX Natural Gas - Three-Way Collars | 2016: 2nd Quarter | Put Option | Bought  
Derivatives Fair Value [Line Items]  
Weighted Average Contract Price 2.25 [1]
NYMEX Natural Gas - Three-Way Collars | 2016: 2nd Quarter | Call Option | Bought  
Derivatives Fair Value [Line Items]  
Weighted Average Contract Price 3.77 [1]
NYMEX Natural Gas - Three-Way Collars | 2016: 2nd Quarter | Call Option | Sold  
Derivatives Fair Value [Line Items]  
Weighted Average Contract Price 3.50 [1]
NYMEX Natural Gas - Three-Way Collars | 2016: 3rd Quarter  
Derivatives Fair Value [Line Items]  
Termination Period 3rd Quarter [1]
Notional Quantity (MMBTUs/day) | MMBTU 40,000 [1]
Notional Quantity (MMBTUs) | MMBTU 3,680,000 [1]
NYMEX Natural Gas - Three-Way Collars | 2016: 3rd Quarter | Put Option | Bought  
Derivatives Fair Value [Line Items]  
Weighted Average Contract Price 2.25 [1]
NYMEX Natural Gas - Three-Way Collars | 2016: 3rd Quarter | Call Option | Bought  
Derivatives Fair Value [Line Items]  
Weighted Average Contract Price 3.77 [1]
NYMEX Natural Gas - Three-Way Collars | 2016: 3rd Quarter | Call Option | Sold  
Derivatives Fair Value [Line Items]  
Weighted Average Contract Price 3.50 [1]
NYMEX Natural Gas - Three-Way Collars | 2016: 4th Quarter  
Derivatives Fair Value [Line Items]  
Termination Period 4th Quarter [1]
Notional Quantity (MMBTUs/day) | MMBTU 40,000 [1]
Notional Quantity (MMBTUs) | MMBTU 3,680,000 [1]
NYMEX Natural Gas - Three-Way Collars | 2016: 4th Quarter | Put Option | Bought  
Derivatives Fair Value [Line Items]  
Weighted Average Contract Price 2.25 [1]
NYMEX Natural Gas - Three-Way Collars | 2016: 4th Quarter | Call Option | Bought  
Derivatives Fair Value [Line Items]  
Weighted Average Contract Price 3.77 [1]
NYMEX Natural Gas - Three-Way Collars | 2016: 4th Quarter | Call Option | Sold  
Derivatives Fair Value [Line Items]  
Weighted Average Contract Price 3.50 [1]
[1] 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 July 2015 production were priced and closed in June 2015 and are not included in the above table as these were not open derivative contracts as of June 30, 2015.