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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Derivative Asset (Liability), Net

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- Definition

Open costless collar contracts for oil and natural gas.

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Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958

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- Definition

The cap rate on a price risk derivative such as a cap or collar. A payment or receipt is triggered if the market rate exceeds the cap rate on the contract.

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Floor rate on a price risk derivative such as a floor or a collar. A payment or receipt is triggered if the market rate falls below the floor rate on the contract.

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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. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611

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-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313

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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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Derivative Financial Instruments (Details) $ in Thousands	Dec. 31, 2018 USD ($) bbl MMBTU $ / bbl $ / MMBTU	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)
Derivative [Line Items]
Derivative Asset (Liability), Net	$ 49,846
Summary of contracts for oil and natural gas
Derivative liability		$ 15,239
Open costless collar contracts
Summary of contracts for oil and natural gas
Fair Value of Asset (Liability)			$ 31,695
Open costless collar contracts \| Oil - WTI
Summary of contracts for oil and natural gas
Notional Quantity (Bbl) \| bbl	3,720,000
Weighted Average Price Floor (usd per Bbl) \| $ / bbl	53.55
Weighted Average Price Ceiling (usd per Bbl) \| $ / bbl	72.22
Fair Value of Asset (Liability)	$ 31,531
Open costless collar contracts \| Natural Gas
Summary of contracts for oil and natural gas
Notional Quantity (Bbl) \| MMBTU	2,400,000
Weighted Average Price Floor (usd per Bbl) \| $ / MMBTU	2.50
Weighted Average Price Ceiling (usd per Bbl) \| $ / MMBTU	3.80
Fair Value of Asset (Liability)	$ 164
Open Swap Contracts
Summary of contracts for oil and natural gas
Fair Value of Asset (Liability)	$ (83)
Open Swap Contracts \| Oil, Calculation Period Two
Summary of contracts for oil and natural gas
Notional Quantity (Bbl) \| bbl	1,200,000
Fair Value of Asset (Liability)	$ (83)
Fixed price (usd per Bbl) \| $ / bbl	(0.15)
Derivative Contract, Calculation Period One \| Open Three-way Costless Collar Contracts
Summary of contracts for oil and natural gas
Fair Value of Asset (Liability)	$ 18,234
Derivative Contract, Calculation Period One \| Open Three-way Costless Collar Contracts \| Oil - WTI
Summary of contracts for oil and natural gas
Notional Quantity (Bbl) \| bbl	1,320,000
Weighted Average Price Floor (usd per Bbl) \| $ / bbl	60.00
Fair Value of Asset (Liability)	$ 18,114
Derivative Contract, Calculation Period One \| Open Three-way Costless Collar Contracts \| Natural Gas
Summary of contracts for oil and natural gas
Notional Quantity (Bbl) \| bbl	4,800,000
Weighted Average Price Floor (usd per Bbl) \| $ / bbl	2.50
Fair Value of Asset (Liability)	$ 120
Short \| Derivative Contract, Calculation Period One \| Open Three-way Costless Collar Contracts \| Oil - WTI
Summary of contracts for oil and natural gas
Weighted Average Price Ceiling (usd per Bbl) \| $ / bbl	75.00
Short \| Derivative Contract, Calculation Period One \| Open Three-way Costless Collar Contracts \| Natural Gas
Summary of contracts for oil and natural gas
Weighted Average Price Ceiling (usd per Bbl) \| $ / bbl	3.00
Long \| Derivative Contract, Calculation Period One \| Open Three-way Costless Collar Contracts \| Oil - WTI
Summary of contracts for oil and natural gas
Weighted Average Price Ceiling (usd per Bbl) \| $ / bbl	78.85
Long \| Derivative Contract, Calculation Period One \| Open Three-way Costless Collar Contracts \| Natural Gas
Summary of contracts for oil and natural gas
Weighted Average Price Ceiling (usd per Bbl) \| $ / bbl	3.24