Derivative Instruments and Hedging Activities (Details) bbl / d in Thousands, MMBTU / d in Thousands	12 Months Ended
Dec. 31, 2015 bbl / d MMBTU / d $ / bbl $ / MMBTU
Crude Oil Commodity Contract \| Swaps - NYMEX WTI 2016
Derivative [Line Items]
Settlement Period	2016
Index	(4)
Volume Per Day \| bbl / d	6
Weighted Average Fixed Price	90.28
Crude Oil Commodity Contract \| Swaps - Dated Brent 2016
Derivative [Line Items]
Settlement Period	2016
Index	Dated Brent
Volume Per Day \| bbl / d	9
Weighted Average Fixed Price	97.96
Crude Oil Commodity Contract \| Three Way Collars - NYMEX WTI 2016
Derivative [Line Items]
Settlement Period	2016
Index	NYMEX WTI
Volume Per Day \| bbl / d	6
Weighted Average Short Put Price	61.00
Weighted Average Floor Price	72.50
Weighted Average Ceiling Price	86.37
Crude Oil Commodity Contract \| Three Way Collars - Dated Brent 2016
Derivative [Line Items]
Settlement Period	2016
Index	Dated Brent
Volume Per Day \| bbl / d	8
Weighted Average Short Put Price	72.50
Weighted Average Floor Price	86.25
Weighted Average Ceiling Price	101.79
Crude Oil Commodity Contract \| Swaps - Dated Brent 2017
Derivative [Line Items]
Volume Per Day \| MMBTU / d	3
Weighted Average Fixed Price \| $ / MMBTU	62.80
Crude Oil Commodity Contract \| Call - NYMEX WTI 2017
Derivative [Line Items]
Settlement Period	2017
Index	NYMEX WTI
Volume Per Day \| bbl / d	3
Weighted Average Ceiling Price	57.00
Crude Oil Commodity Contract \| Two Way Collars - NYMEX WTI 2017
Derivative [Line Items]
Settlement Period	2017
Index	NYMEX WTI
Volume Per Day \| bbl / d	5
Weighted Average Floor Price	40.00
Weighted Average Ceiling Price	54.00
Crude Oil Commodity Contract \| Two Way Collars - NYMEX HH 2016
Derivative [Line Items]
Settlement Period	2016
Index	NYMEX WTI
Volume Per Day \| bbl / d	1
Weighted Average Floor Price	60.00
Weighted Average Ceiling Price	70.00
Natural Gas Commodity Contract \| Swaps - NYMEX HH Extension
Derivative [Line Items]
Volume Per Day \| MMBTU / d	30
Natural Gas Commodity Contract \| Swaps - NYMEX HH 2016
Derivative [Line Items]
Settlement Period	2016
Index	NYMEX HH
Volume Per Day \| MMBTU / d	40
Weighted Average Fixed Price \| $ / MMBTU	3.60
Natural Gas Commodity Contract \| Three Way Collars - NYMEX HH 2016
Derivative [Line Items]
Settlement Period	2016
Index	NYMEX HH
Volume Per Day \| MMBTU / d	90
Weighted Average Short Put Price \| $ / MMBTU	2.83
Weighted Average Floor Price \| $ / MMBTU	3.42
Weighted Average Ceiling Price \| $ / MMBTU	3.90
Natural Gas Commodity Contract \| Two Way Collars - NYMEX HH 2016
Derivative [Line Items]
Settlement Period	2016
Index	NYMEX HH
Volume Per Day \| MMBTU / d	30
Weighted Average Floor Price \| $ / MMBTU	3.00
Weighted Average Ceiling Price \| $ / MMBTU	3.50
Natural Gas Commodity Contract \| Swaps - Houston Ship Channel and Tennessee Zone 0 2016
Derivative [Line Items]
Settlement Period	2016
Index	Houston Ship Channel
Volume Per Day \| MMBTU / d	30
Weighted Average Fixed Price \| $ / MMBTU	4.04
Natural Gas Commodity Contract \| Two Way Collars - Houston Ship Channel and Tennessee Zone 0 2016
Derivative [Line Items]
Settlement Period	2016
Index	Houston Ship Channel
Volume Per Day \| MMBTU / d	30
Weighted Average Floor Price \| $ / MMBTU	3.50
Weighted Average Ceiling Price \| $ / MMBTU	5.60
Natural Gas Commodity Contract \| Swaps - NYMEX HH Increase
Derivative [Line Items]
Volume Per Day \| MMBTU / d	30
Weighted Average Fixed Price \| $ / MMBTU	3.50
First half 2016 \| Crude Oil Commodity Contract \| Swaps - NYMEX WTI 2016
Derivative [Line Items]
Settlement Period	1H16 (1)
Index	NYMEX WTI
Volume Per Day \| bbl / d	17
Weighted Average Fixed Price	68.50
Second half 2016 \| Crude Oil Commodity Contract \| Swaps - NYMEX WTI 2016
Derivative [Line Items]
Settlement Period	2H16 (1)
Index	NYMEX WTI
Volume Per Day \| bbl / d	12
Weighted Average Fixed Price	74.47
Second half 2016 \| Crude Oil Commodity Contract \| Call - NYMEX WTI 2016
Derivative [Line Items]
Settlement Period	2H16 (1)
Index	NYMEX WTI
Volume Per Day \| bbl / d	5
Weighted Average Ceiling Price	54.16
First half 2017 \| Crude Oil Commodity Contract \| Swaps - NYMEX WTI 2017
Derivative [Line Items]
Settlement Period	1H17 (1)
Index	NYMEX WTI
Volume Per Day \| bbl / d	3
Weighted Average Fixed Price	60.12
First half 2017 \| Crude Oil Commodity Contract \| Swaps - Dated Brent 2017
Derivative [Line Items]
Settlement Period	1H17 (1)
Index	Dated Brent
Volume Per Day \| bbl / d	3
Weighted Average Fixed Price	62.80
Second half 2017 \| Crude Oil Commodity Contract \| Call - NYMEX WTI 2017
Derivative [Line Items]
Settlement Period	2H17 (1)
Index	NYMEX WTI
Volume Per Day \| bbl / d	3
Weighted Average Ceiling Price	60.12

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

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

Contract period of time relating to a derivative instrument.

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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.

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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

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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

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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

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

+ References

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- Definition

Reference to the index or unit of measurement for the underlying which establishes the pricing terms of the derivative instrument. For example, the basis on the underlying for a natural gas futures contract might be the NYMEX price per million British thermal units (MMBtu).

+ References

No definition available.

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