Derivative Instruments (Schedule of Crude Oil Derivative Positions) (Details) - Crude Oil	Jun. 30, 2018 bbl / d $ / bbls
Q3 - Q4 2018 \| Fixed Price Swaps
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount \| bbl / d	6,000
Weighted Average Fixed Price ($/Bbl)	(49.55)
Q3 - Q4 2018 \| Basis Swaps \| LLS-NYMEX Price Differential
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount \| bbl / d	18,000
Weighted Average Fixed Price ($/Bbl)	(5.11)
Q3 - Q4 2018 \| Basis Swaps \| Midland-NYMEX Price Differential
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount \| bbl / d	6,000
Weighted Average Fixed Price ($/Bbl)	(0.10)
Q3 - Q4 2018 \| Three-way Collars
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount \| bbl / d	24,000
Weighted Average Sub-Floor Price ($/Bbls)	39.38
Weighted Average Floor Price ($/Bbls)	49.06
Weighted Average Ceiling Price ($/Bbls)	60.14
Q3 - Q4 2018 \| Call Option
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount \| bbl / d	3,388
Weighted Average Ceiling Price ($/Bbls)	71.33
1H 2019 \| Basis Swaps \| Midland-NYMEX Price Differential
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount \| bbl / d	3,000
Weighted Average Fixed Price ($/Bbl)	(3.83)
Q3 2019 \| Basis Swaps \| Midland-NYMEX Price Differential
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount \| bbl / d	3,500
Weighted Average Fixed Price ($/Bbl)	(4.18)
Q4 2019 \| Basis Swaps \| Midland-NYMEX Price Differential
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount \| bbl / d	6,000
Weighted Average Fixed Price ($/Bbl)	(3.71)
FY 2019 \| Three-way Collars
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount \| bbl / d	15,000
Weighted Average Sub-Floor Price ($/Bbls)	41.00
Weighted Average Floor Price ($/Bbls)	49.72
Weighted Average Ceiling Price ($/Bbls)	62.48
FY 2019 \| Call Option
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount \| bbl / d	3,875
Weighted Average Ceiling Price ($/Bbls)	73.66
FY 2020 \| Call Option
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount \| bbl / d	4,575
Weighted Average Ceiling Price ($/Bbls)	75.98

Derivative, Average Sub-Floor Price

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- Definition

Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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- Definition

The average cap rate on a group of price risk derivatives such as caps or collars. A payment or receipt is triggered if the market rate exceeds the cap rate on the contract.

+ References

No definition available.

+ Details

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- Definition

The average floor rate on a group of price risk derivatives such as floors or collars. A payment or receipt is triggered if the market rate falls below the floor rate on the contract.

+ References

No definition available.

+ Details

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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.

+ References

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- Definition

Average fixed price related to the group of price risk swap derivatives.

+ References

No definition available.

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