Financial Instruments - Schedule of Contracted Volumes and Weighted Average Prices and will Receive Under Derivative Contracts (Details)	6 Months Ended	12 Months Ended
Jun. 30, 2018 MMBTU $ / bbl $ / MMBTU bbl	Dec. 31, 2017 MMBTU $ / bbl $ / MMBTU bbl
July Two Thousand Eighteen To December Two Thousand Eighteen Production \| Henry Hub \| NYMEX \| Swap
Average Sales Price And Production Costs Per Unit Of Production [Line Items]
Instrument Type	Swap
Average Daily Volumes \| MMBTU	23,747
Weighted Average Swap Price \| $ / MMBTU	3.01
July Two Thousand Eighteen To December Two Thousand Eighteen Production \| Henry Hub \| NYMEX \| Collar
Average Sales Price And Production Costs Per Unit Of Production [Line Items]
Instrument Type	Collar
Average Daily Volumes \| MMBTU	6,000
Weighted Average Put Price	2.75
Weighted Average Call Price	3.24
January 2019 - December 2019 \| Henry Hub \| NYMEX \| Swap
Average Sales Price And Production Costs Per Unit Of Production [Line Items]
Instrument Type	Swap	Swap
Average Daily Volumes \| bbl	10,146
Average Daily Volumes \| MMBTU		10,146
Weighted Average Swap Price	2.99	2.99
January 2018 - December 2018 \| Henry Hub \| NYMEX \| Swap
Average Sales Price And Production Costs Per Unit Of Production [Line Items]
Instrument Type		Swap
Average Daily Volumes \| MMBTU		26,346
Weighted Average Swap Price \| $ / MMBTU		3.00
Crude Oil \| WTI \| July Two Thousand Eighteen To December Two Thousand Eighteen Production \| Swap
Average Sales Price And Production Costs Per Unit Of Production [Line Items]
Instrument Type	Swap
Average Daily Volumes \| bbl	29,615
Weighted Average Swap Price	54.06
Crude Oil \| WTI \| July Two Thousand Eighteen To December Two Thousand Eighteen Production \| Collar
Average Sales Price And Production Costs Per Unit Of Production [Line Items]
Instrument Type	Collar
Average Daily Volumes \| bbl	1,000
Weighted Average Put Price	45.00
Weighted Average Call Price	55.35
Crude Oil \| WTI \| July Two Thousand Eighteen To December Two Thousand Eighteen Production \| Put
Average Sales Price And Production Costs Per Unit Of Production [Line Items]
Instrument Type	Put
Average Daily Volumes \| bbl	2,000
Weighted Average Put Price	49.50
Crude Oil \| WTI \| January 2019 - December 2019 \| Swap
Average Sales Price And Production Costs Per Unit Of Production [Line Items]
Instrument Type	Swap	Swap
Average Daily Volumes \| bbl	23,130	15,866
Weighted Average Swap Price	54.14	53.17
Crude Oil \| WTI \| January 2018 - December 2018 \| Swap
Average Sales Price And Production Costs Per Unit Of Production [Line Items]
Instrument Type		Swap
Average Daily Volumes \| bbl		24,804
Weighted Average Swap Price		53.79
Crude Oil \| WTI \| January 2019 – June 2019 \| Swap
Average Sales Price And Production Costs Per Unit Of Production [Line Items]
Instrument Type		Swap
Average Daily Volumes \| bbl		1,008
Weighted Average Swap Price		56.25

Derivative Weighted Average Strike Price Call Options.

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- Definition

Derivative Weighted Average Strike Price Put Options.

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Nominal energy measure used to calculate payments on a derivative instrument.

+ References

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- Definition

Nominal volume used to calculate payments on a derivative instrument.

+ References

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- Definition

Average variable price rate related to the group of price risk swap derivatives.

+ References

No definition available.

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- Definition

Description of the type of derivative instrument, such as a swap, forward, and option. Excludes the underlying risk of the instrument.

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