Quarterly report pursuant to Section 13 or 15(d)

Derivative Financial Instruments - Summary of Open Commodity Derivative Contracts (Details)

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Derivative Financial Instruments - Summary of Open Commodity Derivative Contracts (Details)
 9 Months Ended
Sep. 30, 2018
$ / Derivative
bbl
N Y M E X Crude Oil Swap  
Derivatives Fair Value [Line Items]  
Termination Period December
Notional Quantity (Bbls/day) 2,000 [1]
Notional Quantity (Bbls) 184,000 [1]
Strike Price | $ / Derivative 63.80
NYMEX Crude Oil Puts  
Derivatives Fair Value [Line Items]  
Termination Period December
Notional Quantity (Bbls/day) 5,000 [1]
Notional Quantity (Bbls) 460,000 [1]
Put Price | $ / Derivative 60.00
NYMEX Crude Oil Two Way Collars | Open Crude Oil Derivative Contracts One  
Derivatives Fair Value [Line Items]  
Termination Period December
Notional Quantity (Bbls/day) 2,000 [1]
Notional Quantity (Bbls) 184,000 [1]
NYMEX Crude Oil Two Way Collars | Open Crude Oil Derivative Contracts One | Put Option | Bought  
Derivatives Fair Value [Line Items]  
Contract Prices | $ / Derivative 60.00
NYMEX Crude Oil Two Way Collars | Open Crude Oil Derivative Contracts One | Call Option | Sold  
Derivatives Fair Value [Line Items]  
Contract Prices | $ / Derivative 69.50
NYMEX Crude Oil Two Way Collars | Open Crude Oil Derivative Contracts Two  
Derivatives Fair Value [Line Items]  
Termination Period December
Notional Quantity (Bbls/day) 2,000 [1]
Notional Quantity (Bbls) 184,000 [1]
NYMEX Crude Oil Two Way Collars | Open Crude Oil Derivative Contracts Two | Put Option | Bought  
Derivatives Fair Value [Line Items]  
Contract Prices | $ / Derivative 55.00
NYMEX Crude Oil Two Way Collars | Open Crude Oil Derivative Contracts Two | Call Option | Sold  
Derivatives Fair Value [Line Items]  
Contract Prices | $ / Derivative 72.75
[1] bbls = barrels