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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- Definition

Calculation period for oil and natural gas.

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- Definition

Derivative notional quantity.

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- Definition

Derivative Notional Quantity Natural Gas

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- Definition

Open costless collar contracts for oil and natural gas.

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No definition available.

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- Definition

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://www.xbrl.org/2003/role/presentationRef
-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.

+ References

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- Definition

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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- 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.

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Derivative Financial Instruments (Details) bbl in Thousands, MMBTU in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) MMBTU $ / MMBTU $ / bbl bbl	Dec. 31, 2017 MMBTU $ / MMBTU	Dec. 31, 2016 MMBTU bbl $ / MMBTU $ / bbl
Oil [Member]
Summary of contracts for oil and natural gas
Calculation Period	01/01/2016 - 12/31/2016
Notional Quantity \| bbl	1,560
Price Floor \| $ / bbl	47.46
Price Ceiling \| $ / bbl	74.64
Natural Gas [Member]
Summary of contracts for oil and natural gas
Calculation Period	01/01/2016 - 12/31/2016
Derivative Notional Quantity Natural Gas \| MMBTU	8,400
Price Floor \| $ / MMBTU	2.75
Price Ceiling \| $ / MMBTU	3.80
Fair Value of Asset (Liability) \| $	$ 3,201
Open costless collar contracts [Member]
Summary of contracts for oil and natural gas
Fair Value of Asset (Liability) \| $	16,284
Open costless collar contracts [Member] \| Oil [Member]
Summary of contracts for oil and natural gas
Fair Value of Asset (Liability) \| $	$ 13,083
Scenario, Forecast [Member] \| Oil [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount \| bbl			600
Summary of contracts for oil and natural gas
Price Floor \| $ / bbl			35.00
Price Ceiling \| $ / bbl			43.23
Scenario, Forecast [Member] \| Natural Gas [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount \| MMBTU		7,200	3,300
Summary of contracts for oil and natural gas
Price Floor \| $ / MMBTU		2.25	2.25
Price Ceiling \| $ / MMBTU		3.57	2.90