Commodity Derivative Contracts (Commodity Derivatives Outstanding Table) (Details)	Dec. 31, 2016 bbl / d $ / Barrel
Q1 \| Swap \| NYMEX [Member]
Derivative [Line Items]
Volume per day \| bbl / d	22,000
Weighted average swap price	42.67
Q1 \| Swap \| LLS [Member]
Derivative [Line Items]
Volume per day \| bbl / d	10,000
Weighted average swap price	43.77
Q1 \| Collar \| NYMEX [Member]
Derivative [Line Items]
Volume per day \| bbl / d	4,000
Derivative, Floor Price	40.00
Derivative, Cap Price	55.40
Weighted average floor price	40.00
Weighted average ceiling price	54.80
Q1 \| Collar \| LLS [Member]
Derivative [Line Items]
Volume per day \| bbl / d	3,000
Derivative, Floor Price	40.00
Derivative, Cap Price	57.35
Weighted average floor price	40.00
Weighted average ceiling price	57.23
Q2 \| Swap \| NYMEX [Member]
Derivative [Line Items]
Volume per day \| bbl / d	22,000
Weighted average swap price	43.99
Q2 \| Swap \| LLS [Member]
Derivative [Line Items]
Volume per day \| bbl / d	7,000
Weighted average swap price	45.35
Q3 \| Three-way Collar \| NYMEX [Member]
Derivative [Line Items]
Volume per day \| bbl / d	13,500
Derivative, Floor Price	40.00
Derivative, Cap Price	70.25
Weighted average sold put price	30.00
Weighted average floor price	40.00
Weighted average ceiling price	69.13
Q3 \| Three-way Collar \| LLS [Member]
Derivative [Line Items]
Volume per day \| bbl / d	2,000
Derivative, Floor Price	41.00
Derivative, Cap Price	69.25
Weighted average sold put price	31.00
Weighted average floor price	41.00
Weighted average ceiling price	69.25
Q4 \| Three-way Collar \| NYMEX [Member]
Derivative [Line Items]
Volume per day \| bbl / d	10,000
Derivative, Floor Price	40.00
Derivative, Cap Price	70.20
Weighted average sold put price	30.00
Weighted average floor price	40.00
Weighted average ceiling price	69.64
Q4 \| Three-way Collar \| LLS [Member]
Derivative [Line Items]
Volume per day \| bbl / d	1,000
Derivative, Floor Price	41.00
Derivative, Cap Price	70.25
Weighted average sold put price	31.00
Weighted average floor price	41.00
Weighted average ceiling price	70.25
Q4 \| Collar \| NYMEX [Member]
Derivative [Line Items]
Volume per day \| bbl / d	1,000
Derivative, Floor Price	40.00
Derivative, Cap Price	70.00
Weighted average floor price	40.00
Weighted average ceiling price	70.00
Minimum \| Q1 \| Swap \| NYMEX [Member]
Derivative [Line Items]
Derivative, Swap Type, Fixed Price	41.15
Minimum \| Q1 \| Swap \| LLS [Member]
Derivative [Line Items]
Derivative, Swap Type, Fixed Price	42.35
Minimum \| Q2 \| Swap \| NYMEX [Member]
Derivative [Line Items]
Derivative, Swap Type, Fixed Price	41.20
Minimum \| Q2 \| Swap \| LLS [Member]
Derivative [Line Items]
Derivative, Swap Type, Fixed Price	42.65
Maximum \| Q1 \| Swap \| NYMEX [Member]
Derivative [Line Items]
Derivative, Swap Type, Fixed Price	45.45
Maximum \| Q1 \| Swap \| LLS [Member]
Derivative [Line Items]
Derivative, Swap Type, Fixed Price	46.15
Maximum \| Q2 \| Swap \| NYMEX [Member]
Derivative [Line Items]
Derivative, Swap Type, Fixed Price	46.50
Maximum \| Q2 \| Swap \| LLS [Member]
Derivative [Line Items]
Derivative, Swap Type, Fixed Price	46.65

- 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

+ Details

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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

The average strike price on the group of price risk option contracts such as put options or call options.

+ References

No definition available.

+ Details

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- Definition

The cap rate on a price risk derivative such as a cap or collar. 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

Floor rate on a price risk derivative such as a floor or a collar. 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.

+ Details

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- Definition

Fixed price related to the price risk swap derivative.

+ References

No definition available.

+ Details

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