Derivative Instruments (Schedule of Crude Oil Derivative Positions) (Details) - Crude Oil	Mar. 31, 2019 bbl / d $ / bbls
2Q 2019 \| Three-way Collars
Derivative [Line Items]
Derivative, Volumes (in Bbl/d) \| bbl / d	27,000
Weighted Average Sub-Floor Price ($/Bbl)	41.67
Weighted Average Floor Price ($/Bbl)	50.96
Weighted Average Ceiling Price ($/Bbl)	74.23
2Q 2019 \| Basis Swaps \| LLS-Cushing WTI Price Differential
Derivative [Line Items]
Derivative, Volumes (in Bbl/d) \| bbl / d	6,000
Weighted Average Fixed Price ($/Bbl)	5.16
2Q 2019 \| Basis Swaps \| Midland WTI-Cushing WTI Price Differential
Derivative [Line Items]
Derivative, Volumes (in Bbl/d) \| bbl / d	7,609
Weighted Average Fixed Price ($/Bbl)	4.38
2Q 2019 \| Call Option
Derivative [Line Items]
Derivative, Volumes (in Bbl/d) \| bbl / d	3,875
Weighted Average Ceiling Price ($/Bbl)	81.07
3Q 2019 \| Three-way Collars
Derivative [Line Items]
Derivative, Volumes (in Bbl/d) \| bbl / d	27,000
Weighted Average Sub-Floor Price ($/Bbl)	41.67
Weighted Average Floor Price ($/Bbl)	50.96
Weighted Average Ceiling Price ($/Bbl)	74.23
3Q 2019 \| Basis Swaps \| LLS-Cushing WTI Price Differential
Derivative [Line Items]
Derivative, Volumes (in Bbl/d) \| bbl / d	6,000
Weighted Average Fixed Price ($/Bbl)	5.16
3Q 2019 \| Basis Swaps \| Midland WTI-Cushing WTI Price Differential
Derivative [Line Items]
Derivative, Volumes (in Bbl/d) \| bbl / d	9,100
Weighted Average Fixed Price ($/Bbl)	4.44
3Q 2019 \| Call Option
Derivative [Line Items]
Derivative, Volumes (in Bbl/d) \| bbl / d	3,875
Weighted Average Ceiling Price ($/Bbl)	81.07
4Q 2019 \| Three-way Collars
Derivative [Line Items]
Derivative, Volumes (in Bbl/d) \| bbl / d	27,000
Weighted Average Sub-Floor Price ($/Bbl)	41.67
Weighted Average Floor Price ($/Bbl)	50.96
Weighted Average Ceiling Price ($/Bbl)	74.23
4Q 2019 \| Basis Swaps \| Midland WTI-Cushing WTI Price Differential
Derivative [Line Items]
Derivative, Volumes (in Bbl/d) \| bbl / d	9,200
Weighted Average Fixed Price ($/Bbl)	4.64
4Q 2019 \| Call Option
Derivative [Line Items]
Derivative, Volumes (in Bbl/d) \| bbl / d	3,875
Weighted Average Ceiling Price ($/Bbl)	81.07
FY 2020 \| Fixed Price Swaps
Derivative [Line Items]
Derivative, Volumes (in Bbl/d) \| bbl / d	3,000
Derivative, Swap Type, Fixed Price	55.06
FY 2020 \| Three-way Collars
Derivative [Line Items]
Derivative, Volumes (in Bbl/d) \| bbl / d	6,000
Weighted Average Sub-Floor Price ($/Bbl)	45.00
Weighted Average Floor Price ($/Bbl)	55.00
Weighted Average Ceiling Price ($/Bbl)	64.69
FY 2020 \| Basis Swaps \| Midland WTI-Cushing WTI Price Differential
Derivative [Line Items]
Derivative, Volumes (in Bbl/d) \| bbl / d	10,658
Weighted Average Fixed Price ($/Bbl)	1.68
FY 2020 \| Call Option
Derivative [Line Items]
Derivative, Volumes (in Bbl/d) \| bbl / d	4,575
Weighted Average Ceiling Price ($/Bbl)	75.98
FY 2021 \| Basis Swaps \| Midland WTI-Cushing WTI Price Differential
Derivative [Line Items]
Derivative, Volumes (in Bbl/d) \| bbl / d	8,000
Weighted Average Fixed Price ($/Bbl)	0.18

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

No definition available.

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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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- Definition

Fixed price related to the price risk swap derivative.

+ References

No definition available.

+ Details

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