Derivative Instruments and Hedging Activities (Details)	12 Months Ended
Dec. 31, 2016 bbl / d MMBTU / d $ / bbl $ / MMBTU
Crude Oil Commodity Contract \| Swaps - NYMEX WTI 2017
Derivative [Line Items]
Settlement Period	2017
Index	NYMEX WTI
Volume Per Day \| bbl / d	4,000
Weighted Average Fixed Price	50.90
Crude Oil Commodity Contract \| Three Way Collars - NYMEX WTI 2017
Derivative [Line Items]
Settlement Period	2017
Index	NYMEX WTI
Volume Per Day \| bbl / d	24,000
Weighted Average Short Put Price	39.08
Weighted Average Floor Price	47.71
Weighted Average Ceiling Price	61.20
Crude Oil Commodity Contract \| Call - NYMEX WTI 2017
Derivative [Line Items]
Settlement Period	2017
Index	NYMEX WTI
Volume Per Day \| bbl / d	3,000
Weighted Average Ceiling Price	57.00
Crude Oil Commodity Contract \| Three Way Collars - ICE Brent 2017
Derivative [Line Items]
Settlement Period	2017
Index	ICE Brent
Volume Per Day \| bbl / d	2,000
Weighted Average Short Put Price	43.00
Weighted Average Floor Price	50.00
Weighted Average Ceiling Price	63.15
Crude Oil Commodity Contract \| Two Way Collars - NYMEX WTI 2017
Derivative [Line Items]
Settlement Period	2017
Index	NYMEX WTI
Volume Per Day \| bbl / d	7,000
Weighted Average Floor Price	40.00
Weighted Average Ceiling Price	53.29
Crude Oil Commodity Contract \| Three Way Collars - Dated Brent 2017
Derivative [Line Items]
Settlement Period	2017
Index	Dated Brent
Volume Per Day \| bbl / d	2,000
Weighted Average Short Put Price	35.00
Weighted Average Floor Price	45.00
Weighted Average Ceiling Price	66.33
Crude Oil Commodity Contract \| Three Way Collars - NYMEX WTI 2018
Derivative [Line Items]
Settlement Period	2018
Index	NYMEX WTI
Volume Per Day \| bbl / d	5,000
Weighted Average Short Put Price	43.00
Weighted Average Floor Price	50.00
Weighted Average Ceiling Price	68.50
Crude Oil Commodity Contract \| Swaps - NYMEX WTI 2018
Derivative [Line Items]
Settlement Period	2018
Index	NYMEX WTI
Volume Per Day \| bbl / d	5,000
Weighted Average Fixed Price	54.03
Crude Oil Commodity Contract \| Swaptions - NYMEX WTI 2018
Derivative [Line Items]
Settlement Period	2018
Index	NYMEX WTI
Volume Per Day \| bbl / d	3,000
Weighted Average Fixed Price	56.10
Crude Oil Commodity Contract \| Three Way Collars - Dated Brent 2018
Derivative [Line Items]
Settlement Period	2018
Index	Dated Brent
Volume Per Day \| bbl / d	3,000
Weighted Average Short Put Price	40.00
Weighted Average Floor Price	50.00
Weighted Average Ceiling Price	70.41
Natural Gas Commodity Contract \| Swaps - NYMEX HH 2016
Derivative [Line Items]
Settlement Period	1H17 (1)
Index	NYMEX HH
Volume Per Day \| MMBTU / d	30,000
Weighted Average Fixed Price \| $ / MMBTU	2.92
Natural Gas Commodity Contract \| Swaps - NYMEX HH 2017 [Member]
Derivative [Line Items]
Settlement Period	2017
Index	NYMEX HH
Volume Per Day \| MMBTU / d	110,000
Weighted Average Fixed Price \| $ / MMBTU	3.16
Natural Gas Commodity Contract \| Three Way Collars - NYMEX HH 2017 [Member]
Derivative [Line Items]
Settlement Period	2017
Index	NYMEX HH
Volume Per Day \| MMBTU / d	210,000
Weighted Average Short Put Price \| $ / MMBTU	2.54
Weighted Average Floor Price \| $ / MMBTU	2.96
Weighted Average Ceiling Price \| $ / MMBTU	3.62
Natural Gas Commodity Contract \| Two Way Collars - NYMEX HH 2017 [Member]
Derivative [Line Items]
Settlement Period	2017
Index	NYMEX HH
Volume Per Day \| MMBTU / d	70,000
Weighted Average Floor Price \| $ / MMBTU	2.93
Weighted Average Ceiling Price \| $ / MMBTU	3.32
Natural Gas Commodity Contract \| Three Way Collars - NYMEX HH 2018 [Member]
Derivative [Line Items]
Settlement Period	2018
Index	NYMEX HH
Volume Per Day \| MMBTU / d	70,000
Weighted Average Short Put Price \| $ / MMBTU	2.50
Weighted Average Floor Price \| $ / MMBTU	2.80
Weighted Average Ceiling Price \| $ / MMBTU	3.76
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	6,000
Weighted Average Fixed Price	55.08
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	3,000
Weighted Average Fixed Price	62.80
First half 2017 \| Crude Oil Commodity Contract \| Two Way Collars - NYMEX WTI 2017
Derivative [Line Items]
Settlement Period	1H17 (1)
Index	NYMEX WTI
Volume Per Day \| bbl / d	2,000
Weighted Average Floor Price	40.00
Weighted Average Ceiling Price	50.44
Second half 2017 \| Crude Oil Commodity Contract \| Swaps - NYMEX WTI 2017
Derivative [Line Items]
Settlement Period	2H17 (1)
Index	Dated Brent
Volume Per Day \| bbl / d	3,000
Weighted Average Fixed Price	62.80
Second half 2017 \| Crude Oil Commodity Contract \| Swaps - Dated Brent 2017
Derivative [Line Items]
Settlement Period	2H17 (1)
Index	NYMEX WTI
Volume Per Day \| bbl / d	3,000
Weighted Average Fixed Price	50.05
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	3,000
Weighted Average Ceiling Price	60.12
Second half 2017 \| Natural Gas Commodity Contract \| Swaps - NYMEX HH 2017 [Member]
Derivative [Line Items]
Settlement Period	2H17 (1)
Index	NYMEX HH
Volume Per Day \| MMBTU / d	30,000
Weighted Average Fixed Price \| $ / MMBTU	3.45
Second half 2017 \| Natural Gas Commodity Contract \| Swaptions - NYMEX HH 2017 [Member] [Member]
Derivative [Line Items]
Volume Per Day \| MMBTU / d	30,000
Weighted Average Fixed Price \| $ / MMBTU	2.92

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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Contract period of time relating to a derivative instrument.

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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.

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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.

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

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

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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).

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