Derivative Instruments and Hedging Activities (Details)	9 Months Ended
Sep. 30, 2016 bbl / d MMBTU / d $ / bbl $ / MMBTU
Crude Oil Commodity Contract \| Swaps - NYMEX WTI 2016
Derivative [Line Items]
Settlement Period	2016
Index	NYMEX WTI
Bbls Per Day \| bbl / d	16,000
Weighted Average Fixed Price	67.69
Crude Oil Commodity Contract \| Two Way Collars - NYMEX WTI 2016 [Member]
Derivative [Line Items]
Settlement Period	2016
Index	NYMEX WTI
Bbls Per Day \| bbl / d	10,000
Weighted Average Floor Price	40.50
Weighted Average Ceiling Price	53.42
Crude Oil Commodity Contract \| Swaps - Dated Brent 2016
Derivative [Line Items]
Settlement Period	2016
Index	Dated Brent
Bbls Per Day \| bbl / d	9,000
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
Bbls Per Day \| bbl / d	8,000
Weighted Average Short Put Price	54.50
Weighted Average Floor Price	65.63
Weighted Average Ceiling Price	79.03
Crude Oil Commodity Contract \| Three Way Collars - Dated Brent 2016
Derivative [Line Items]
Settlement Period	2016
Index	Dated Brent
Bbls Per Day \| bbl / d	8,000
Weighted Average Short Put Price	72.50
Weighted Average Floor Price	86.25
Weighted Average Ceiling Price	101.79
Crude Oil Commodity Contract \| Call - NYMEX WTI 2016 [Member]
Derivative [Line Items]
Settlement Period	2016
Index	NYMEX WTI
Bbls Per Day \| bbl / d	5,000
Weighted Average Ceiling Price	54.16
Crude Oil Commodity Contract \| Call - NYMEX WTI 2017 [Member]
Derivative [Line Items]
Settlement Period	2017
Index	NYMEX WTI
Bbls Per Day \| bbl / d	3,000
Weighted Average Ceiling Price	57.00
Crude Oil Commodity Contract \| Swaps - NYMEX WTI 2017 [Member]
Derivative [Line Items]
Settlement Period	2017
Index	NYMEX WTI
Bbls Per Day \| bbl / d	4,000
Weighted Average Ceiling Price	47.34
Crude Oil Commodity Contract \| Two Way Collars - NYMEX WTI 2017 [Member]
Derivative [Line Items]
Settlement Period	2017
Index	NYMEX WTI
Bbls 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 - NYMEX WTI 2017 [Member]
Derivative [Line Items]
Settlement Period	2017
Index	NYMEX WTI
Bbls Per Day \| bbl / d	15,000
Weighted Average Short Put Price	36.33
Weighted Average Floor Price	46.33
Weighted Average Ceiling Price	60.68
Crude Oil Commodity Contract \| Three Way Collars - Dated Brent 2017 [Member]
Derivative [Line Items]
Settlement Period	2017
Index	Dated Brent
Bbls 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 - Dated Brent 2018 [Member]
Derivative [Line Items]
Settlement Period	2018
Index	Dated Brent
Bbls 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	2016
Index	NYMEX HH
Bbls Per Day \| MMBTU / d	70,000
Weighted Average Fixed Price \| $ / MMBTU	3.24
Natural Gas Commodity Contract \| Two Way Collars - NYMEX HH 2016
Derivative [Line Items]
Settlement Period	2016
Index	NYMEX HH
Bbls Per Day \| MMBTU / d	30,000
Weighted Average Floor Price \| $ / MMBTU	3.00
Weighted Average Ceiling Price \| $ / MMBTU	3.50
Natural Gas Commodity Contract \| Three Way Collars - NYMEX HH 2016 [Member]
Derivative [Line Items]
Settlement Period	2016
Index	NYMEX HH
Bbls Per Day \| MMBTU / d	90,000
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 \| Swaps - NYMEX HH 2017 [Member]
Derivative [Line Items]
Settlement Period	2017
Index	NYMEX HH
Bbls Per Day \| MMBTU / d	30,000
Weighted Average Fixed Price \| $ / MMBTU	3.15
Natural Gas Commodity Contract \| Swaptions - NYMEX HH 2017 [Member] [Member]
Derivative [Line Items]
Settlement Period	2017
Index	NYMEX HH
Bbls Per Day \| MMBTU / d	60,000
Weighted Average Ceiling Price \| $ / MMBTU	3.14
Natural Gas Commodity Contract \| Three Way Collars - NYMEX HH 2017 [Member]
Derivative [Line Items]
Settlement Period	2017
Index	NYMEX HH
Bbls Per Day \| MMBTU / d	180,000
Weighted Average Short Put Price \| $ / MMBTU	2.50
Weighted Average Floor Price \| $ / MMBTU	2.93
Weighted Average Ceiling Price \| $ / MMBTU	3.58
Natural Gas Commodity Contract \| Two Way Collars - NYMEX HH 2017 [Member]
Derivative [Line Items]
Settlement Period	2017
Index	NYMEX HH
Bbls 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
Bbls 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
Rosetta Resources, Inc [Member] \| Crude Oil Commodity Contract \| Swaps - NYMEX WTI 2016
Derivative [Line Items]
Settlement Period	2016
Index	(3)
Bbls Per Day \| bbl / d	6,000
Weighted Average Fixed Price	90.28
Rosetta Resources, Inc [Member] \| Natural Gas Commodity Contract \| Swaps - Houston Ship Channel and Tennessee Zone 0 2016 [Member] [Member]
Derivative [Line Items]
Settlement Period	2016
Index	(2)
Bbls Per Day \| MMBTU / d	30,000
Weighted Average Fixed Price \| $ / MMBTU	4.04
Rosetta Resources, Inc [Member] \| Natural Gas Commodity Contract \| Two Way Collars - Houston Ship Channel and Tennessee Zone 0 2016 [Member]
Derivative [Line Items]
Settlement Period	2016
Index	(2)
Bbls Per Day \| MMBTU / d	30,000
Weighted Average Floor Price \| $ / MMBTU	3.50
Weighted Average Ceiling Price \| $ / MMBTU	5.60
Second half 2017 [Member] \| Crude Oil Commodity Contract \| Call - NYMEX WTI 2017 [Member]
Derivative [Line Items]
Settlement Period	2H17 (4)
Index	NYMEX WTI
Bbls Per Day \| bbl / d	3,000
Weighted Average Ceiling Price	60.12
Second half 2017 [Member] \| Crude Oil Commodity Contract \| Swaps - NYMEX WTI 2017 [Member]
Derivative [Line Items]
Settlement Period	2H17 (4)
Index	NYMEX WTI
Bbls Per Day \| bbl / d	3,000
Weighted Average Ceiling Price	50.05
Second half 2017 [Member] \| Crude Oil Commodity Contract \| Swaps - Dated Brent 2017 [Member]
Derivative [Line Items]
Settlement Period	2H17 (4)
Index	Dated Brent
Bbls Per Day \| bbl / d	3,000
Weighted Average Ceiling Price	62.80
Second half 2017 [Member] \| Natural Gas Commodity Contract \| Swaps - NYMEX HH 2017 [Member]
Derivative [Line Items]
Settlement Period	2H17
Index	NYMEX HH
Bbls Per Day \| MMBTU / d	30,000
Weighted Average Ceiling Price \| $ / MMBTU	2.92
First half 2017 [Member] \| Crude Oil Commodity Contract \| Swaps - NYMEX WTI 2017 [Member]
Derivative [Line Items]
Settlement Period	1H17 (4)
Index	NYMEX WTI
Bbls Per Day \| bbl / d	6,000
Weighted Average Fixed Price	55.08
First half 2017 [Member] \| Crude Oil Commodity Contract \| Swaps - Dated Brent 2017 [Member]
Derivative [Line Items]
Settlement Period	1H17 (4)
Index	Dated Brent
Bbls Per Day \| bbl / d	3,000
Weighted Average Fixed Price	62.80
First half 2017 [Member] \| Crude Oil Commodity Contract \| Two Way Collars - NYMEX WTI 2017 [Member]
Derivative [Line Items]
Settlement Period	1H17 (4)
Index	NYMEX WTI
Bbls Per Day \| bbl / d	2,000
Weighted Average Floor Price	40.00
Weighted Average Ceiling Price	50.44
First half 2017 [Member] \| Natural Gas Commodity Contract \| Swaps - NYMEX HH 2017 [Member]
Derivative [Line Items]
Settlement Period	1H17
Index	NYMEX HH
Bbls 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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- 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.

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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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