The amount of cash received during the period for offsetting hedges.

No definition available.

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- Definition

This element reflects realized gain (loss) on the settlement of financial commodity derivative instruments.

+ References

No definition available.

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- Definition

Percent of total receivables represented by amounts due from a single external customer.

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No definition available.

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- Definition

Fair value, after the 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, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
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- Definition

Fair value, after the 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, expected to be settled after one year or the normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

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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.

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- References

No definition available.

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- Definition

Amount of obligation to return cash collateral under master netting arrangements that have not been offset against derivative assets.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 13
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- Definition

Amount of right to receive cash collateral under master netting arrangements that have not been offset against derivative liabilities.

+ References

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Fair value, after the effects of master netting arrangements, of a financial liability or 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, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

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- Definition

Fair value, after the effects of master netting arrangements, of a financial liability or 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, expected to be settled after one year or the normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

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- Definition

Nominal energy measure used to calculate payments on a derivative instrument.

+ References

No definition available.

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- Definition

Nominal volume used to calculate payments on a derivative instrument.

+ References

No definition available.

+ Details

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- Definition

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

+ References

No definition available.

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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

The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of open derivatives, commodity, or energy contracts, held at each balance sheet date, that was included in earnings for the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585

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Risk Management Activities (Details)	12 Months Ended
Risk Management Activities (Details)	Dec. 31, 2018 USD ($) MMBTU $ / bbl $ / MMBTU bbl	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Derivatives, Fair Value [Line Items]
Derivative, Cash Received For Offsetting Hedges	$ 26,100,000
Assets from Price Risk Management Activities	23,806,000	$ 7,699,000
Liabilities from Price Risk Management Activities	$ 0	$ 50,429,000
Receivable Major Customer Percentage	10.00%	10.00%
Gains (Losses) on Mark-to-Market Commodity Derivative Contracts	$ (165,640,000)	$ 19,828,000	$ (99,608,000)
Net Cash Received from (Payments for) Settlements of Commodity Derivatives Contracts	(258,906,000)	7,438,000	$ (22,219,000)
Derivative Collateral [Abstract]
Collateral Held on Derivative	0	0
Collateral Had on Derivaitve	0	0
Assets [Member] \| Price Risk Derivative [Member]
Derivatives, Fair Value [Line Items]
Assets from Price Risk Management Activities	24,000,000	8,000,000
Other Assets [Member] \| Price Risk Derivative [Member]
Derivatives, Fair Value [Line Items]
Other Assets	0	0
Liabilities From Price Risk Management Activities [Member]
Derivatives, Fair Value [Line Items]
Assets from Price Risk Management Activities		5,000,000
Liabilities from Price Risk Management Activities		55,000,000
Liabilities From Price Risk Management Activities [Member] \| Price Risk Derivative [Member]
Derivatives, Fair Value [Line Items]
Liabilities from Price Risk Management Activities	0	50,000,000
Liability [Member] \| Price Risk Derivative [Member]
Derivatives, Fair Value [Line Items]
Other Liabilities	$ 0	$ 7,000,000
Crude Oil [Member] \| Midland Differential Basis Swap [Member] \| Derivative Contracts - January through December (closed) [Member]
Derivatives, Fair Value [Line Items]
Volume (Bbld) \| bbl	15,000
Derivative, Swap Type, Average Fixed Price \| $ / bbl	1.063
Crude Oil [Member] \| Midland Differential Basis Swap [Member] \| Derivative Contracts - Year Two - January (closed) [Member]
Derivatives, Fair Value [Line Items]
Volume (Bbld) \| bbl	20,000
Derivative, Swap Type, Average Fixed Price \| $ / bbl	1.075
Crude Oil [Member] \| Midland Differential Basis Swap [Member] \| Derivative Contracts - Year Two - February through December [Member]
Derivatives, Fair Value [Line Items]
Volume (Bbld) \| bbl	20,000
Derivative, Swap Type, Average Fixed Price \| $ / bbl	1.075
Crude Oil [Member] \| Gulf Coast Differential Basis Swap [Member] \| Derivative Contracts - Year Two - January (closed) [Member]
Derivatives, Fair Value [Line Items]
Volume (Bbld) \| bbl	13,000
Derivative, Swap Type, Average Fixed Price \| $ / bbl	5.572
Crude Oil [Member] \| Gulf Coast Differential Basis Swap [Member] \| Derivative Contracts - Year Two - February through December [Member]
Derivatives, Fair Value [Line Items]
Volume (Bbld) \| bbl	13,000
Derivative, Swap Type, Average Fixed Price \| $ / bbl	5.572
Crude Oil [Member] \| Gulf Coast Differential Basis Swap [Member] \| Derivative Contracts - January through September (closed) [Member]
Derivatives, Fair Value [Line Items]
Volume (Bbld) \| bbl	37,000
Derivative, Swap Type, Average Fixed Price \| $ / bbl	3.818
Crude Oil [Member] \| Gulf Coast Differential Basis Swap [Member] \| Derivative Contracts - October through December (closed) [Member]
Derivatives, Fair Value [Line Items]
Volume (Bbld) \| bbl	52,000
Derivative, Swap Type, Average Fixed Price \| $ / bbl	3.911
Crude Oil [Member] \| Price Swap [Member] \| Derivative Contracts - January through November (closed) [Member]
Derivatives, Fair Value [Line Items]
Volume (Bbld) \| bbl	134,000
Derivative, Swap Type, Average Fixed Price \| $ / bbl	60.04
Crude Oil [Member] \| Price Swap [Member] \| Derivative Contracts - December (closed) [Member]
Derivatives, Fair Value [Line Items]
Volume (Bbld) \| bbl	134,000
Derivative, Swap Type, Average Fixed Price \| $ / bbl	53.75
Crude Oil [Member] \| Price Swap [Member] \| Crude Oil Derivative Contracts - December (closed) [Member]
Derivatives, Fair Value [Line Items]
Volume (Bbld) \| bbl	134,000
Derivative, Swap Type, Average Fixed Price \| $ / bbl	60.04
Natural Gas [Member] \| Price Swap [Member] \| Derivative Contracts - March through November (closed) [Member]
Derivatives, Fair Value [Line Items]
Derivative, Swap Type, Average Fixed Price \| $ / MMBTU	3.00
volume (MMBTU) \| MMBTU	35,000
Natural Gas [Member] \| Call Option [Member] \| Derivative Contracts - March through November (closed) [Member]
Derivatives, Fair Value [Line Items]
volume (MMBTU) \| MMBTU	120,000
Derivative, Average Price Risk Option Strike Price \| $ / MMBTU	3.38
Natural Gas [Member] \| Put Option [Member] \| Derivative Contracts - March through November (closed) [Member]
Derivatives, Fair Value [Line Items]
volume (MMBTU) \| MMBTU	96,000
Derivative, Average Price Risk Option Strike Price \| $ / MMBTU	2.94