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Future Gas Production Hedged in MMBtu (Energy Item Type)

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Payables for Settled Derivatives

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Receivables for Settled Derivatives

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Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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Fair value of the assets less the liabilities of a derivative or group of derivatives.

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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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The aggregate net gain (loss) on price risk derivatives included in earnings in the period.

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The quantity of future oil and gas production being hedged.

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Price-Risk Management Price-Risk Management (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($) MMBTU $ / MMBTU $ / Boe bbl	Mar. 31, 2017 USD ($)	Dec. 31, 2017 USD ($)
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain (Loss) on Price Risk Derivatives, Net \| $	$ (6,400)	$ 10,900
Cash Received (Paid) On Settlements of Derivative Contracts \| $	977	$ (811)
Receivables for Settled Derivatives \| $	600		$ 2,200
Payables for Settled Derivatives \| $	900		400
Derivative, Fair Value, Net \| $	(5,400)		(100)
Other Current Assets [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Asset, Fair Value, Gross Asset \| $	2,700		5,100
Other Noncurrent Assets [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Asset, Fair Value, Gross Asset \| $	3,100		2,600
Other Current Liabilities [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Liability, Fair Value, Gross Liability \| $	7,700		5,100
Other Noncurrent Liabilities [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Liability, Fair Value, Gross Liability \| $	$ 3,500		$ 2,800
Swap [Member] \| Oil Derivative Swaps [Member] \| Second Quarter 2018 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Swap Type, Fixed Price \| $ / Boe	52.57
Portion of Future Oil and Gas Production Being Hedged \| bbl	140,400
Swap [Member] \| Oil Derivative Swaps [Member] \| Third Quarter 2018 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Swap Type, Fixed Price \| $ / Boe	52.40
Portion of Future Oil and Gas Production Being Hedged \| bbl	130,400
Swap [Member] \| Oil Derivative Swaps [Member] \| Fourth Quarter 2018 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Swap Type, Fixed Price \| $ / Boe	52.23
Portion of Future Oil and Gas Production Being Hedged \| bbl	122,800
Swap [Member] \| Oil Derivative Swaps [Member] \| First Quarter 2019 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Swap Type, Fixed Price \| $ / Boe	52.77
Portion of Future Oil and Gas Production Being Hedged \| bbl	107,700
Swap [Member] \| Oil Derivative Swaps [Member] \| Second Quarter 2019 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Swap Type, Fixed Price \| $ / Boe	52.72
Portion of Future Oil and Gas Production Being Hedged \| bbl	103,200
Swap [Member] \| Oil Derivative Swaps [Member] \| Third Quarter 2019 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Swap Type, Fixed Price \| $ / Boe	52.79
Portion of Future Oil and Gas Production Being Hedged \| bbl	99,000
Swap [Member] \| Oil Derivative Swaps [Member] \| Fourth Quarter 2019 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Swap Type, Fixed Price \| $ / Boe	52.73
Portion of Future Oil and Gas Production Being Hedged \| bbl	95,000
Swap [Member] \| Oil Derivative Swaps [Member] \| First Quarter 2020 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Swap Type, Fixed Price \| $ / Boe	52.42
Portion of Future Oil and Gas Production Being Hedged \| bbl	81,300
Swap [Member] \| Oil Derivative Swaps [Member] \| Second Quarter 2020 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Swap Type, Fixed Price \| $ / Boe	52.38
Portion of Future Oil and Gas Production Being Hedged \| bbl	77,850
Swap [Member] \| Oil Derivative Swaps [Member] \| Third Quarter 2020 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Swap Type, Fixed Price \| $ / Boe	52.34
Portion of Future Oil and Gas Production Being Hedged \| bbl	74,700
Swap [Member] \| Oil Derivative Swaps [Member] \| Fourth Quarter 2020 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Swap Type, Fixed Price \| $ / Boe	52.29
Portion of Future Oil and Gas Production Being Hedged \| bbl	72,000
Swap [Member] \| Natural Gas Derivative Swaps [Member] \| Second Quarter 2018 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Swap Type, Fixed Price	2.87
Future Gas Production Hedged in MMBtu (Energy Item Type) \| MMBTU	5,868,000
Swap [Member] \| Natural Gas Derivative Swaps [Member] \| Third Quarter 2018 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Swap Type, Fixed Price	2.88
Future Gas Production Hedged in MMBtu (Energy Item Type) \| MMBTU	9,834,000
Swap [Member] \| Natural Gas Derivative Swaps [Member] \| Fourth Quarter 2018 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Swap Type, Fixed Price	2.96
Future Gas Production Hedged in MMBtu (Energy Item Type) \| MMBTU	11,241,000
Swap [Member] \| Natural Gas Derivative Swaps [Member] \| First Quarter 2019 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Swap Type, Fixed Price	3.08
Future Gas Production Hedged in MMBtu (Energy Item Type) \| MMBTU	7,516,000
Swap [Member] \| Natural Gas Derivative Swaps [Member] \| Second Quarter 2019 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Swap Type, Fixed Price	2.83
Future Gas Production Hedged in MMBtu (Energy Item Type) \| MMBTU	6,060,000
Swap [Member] \| Natural Gas Derivative Swaps [Member] \| Third Quarter 2019 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Swap Type, Fixed Price	2.84
Future Gas Production Hedged in MMBtu (Energy Item Type) \| MMBTU	5,550,000
Swap [Member] \| Natural Gas Derivative Swaps [Member] \| Fourth Quarter 2019 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Swap Type, Fixed Price	2.84
Future Gas Production Hedged in MMBtu (Energy Item Type) \| MMBTU	5,966,000
Swap [Member] \| Natural Gas Derivative Swaps [Member] \| First Quarter 2020 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Swap Type, Fixed Price	2.83
Future Gas Production Hedged in MMBtu (Energy Item Type) \| MMBTU	5,370,000
Swap [Member] \| Natural Gas Derivative Swaps [Member] \| Second Quarter 2020 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Swap Type, Fixed Price	2.76
Future Gas Production Hedged in MMBtu (Energy Item Type) \| MMBTU	3,688,000
Swap [Member] \| Natural Gas Derivative Swaps [Member] \| Third Quarter 2020 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Swap Type, Fixed Price	2.76
Future Gas Production Hedged in MMBtu (Energy Item Type) \| MMBTU	3,585,000
Swap [Member] \| Natural Gas Derivative Swaps [Member] \| Fourth Quarter 2020 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Swap Type, Fixed Price	2.77
Future Gas Production Hedged in MMBtu (Energy Item Type) \| MMBTU	3,362,000
Swap [Member] \| Natural Gas Liquid Derivative [Member] \| Second Quarter 2018 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Swap Type, Fixed Price	24.78
Future NGL Production Hedged in Bbls (Energy Item Type) \| bbl	118,200
Swap [Member] \| Natural Gas Liquid Derivative [Member] \| Third Quarter 2018 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Swap Type, Fixed Price	24.78
Future NGL Production Hedged in Bbls (Energy Item Type) \| bbl	112,200
Swap [Member] \| Natural Gas Liquid Derivative [Member] \| Fourth Quarter 2018 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Swap Type, Fixed Price	24.78
Future NGL Production Hedged in Bbls (Energy Item Type) \| bbl	148,200
Basis Swap [Member] \| Natural Gas Basis Derivative Swaps [Member] \| Second Quarter 2018 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Basis Swap Type, Fixed Price	(0.04)
Future Gas Production Hedged in MMBtu (Energy Item Type) \| MMBTU	5,765,000
Basis Swap [Member] \| Natural Gas Basis Derivative Swaps [Member] \| Third Quarter 2018 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Basis Swap Type, Fixed Price	(0.02)
Future Gas Production Hedged in MMBtu (Energy Item Type) \| MMBTU	9,460,000
Basis Swap [Member] \| Natural Gas Basis Derivative Swaps [Member] \| Fourth Quarter 2018 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Basis Swap Type, Fixed Price	(0.08)
Future Gas Production Hedged in MMBtu (Energy Item Type) \| MMBTU	10,550,000
Basis Swap [Member] \| Natural Gas Basis Derivative Swaps [Member] \| First Quarter 2019 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Basis Swap Type, Fixed Price	(0.10)
Future Gas Production Hedged in MMBtu (Energy Item Type) \| MMBTU	1,200,000
Basis Swap [Member] \| Natural Gas Basis Derivative Swaps [Member] \| Second Quarter 2019 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Basis Swap Type, Fixed Price	0.02
Future Gas Production Hedged in MMBtu (Energy Item Type) \| MMBTU	1,205,000
Basis Swap [Member] \| Natural Gas Basis Derivative Swaps [Member] \| Third Quarter 2019 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Basis Swap Type, Fixed Price	0.02
Future Gas Production Hedged in MMBtu (Energy Item Type) \| MMBTU	1,210,000
Basis Swap [Member] \| Natural Gas Basis Derivative Swaps [Member] \| Fourth Quarter 2019 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Basis Swap Type, Fixed Price	(0.05)
Future Gas Production Hedged in MMBtu (Energy Item Type) \| MMBTU	1,210,000
Basis Swap [Member] \| Oil Basis Derivative [Member] \| Second Quarter 2018 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Basis Swap Type, Fixed Price	(4.13)
Portion of Future Oil and Gas Production Being Hedged \| bbl	80,000
Basis Swap [Member] \| Oil Basis Derivative [Member] \| Third Quarter 2018 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Basis Swap Type, Fixed Price	(4.13)
Portion of Future Oil and Gas Production Being Hedged \| bbl	120,000
Basis Swap [Member] \| Oil Basis Derivative [Member] \| Fourth Quarter 2018 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Basis Swap Type, Fixed Price	(4.13)
Portion of Future Oil and Gas Production Being Hedged \| bbl	120,000