Derivative Financial Instruments (Details) $ in Thousands	Dec. 31, 2017 USD ($) MMBTU bbl $ / bbl $ / MMBTU	Sep. 30, 2017 USD ($)
Summary of contracts for oil and natural gas
Fair Value of Asset (Liability)	$ (15,239)
Open costless collar contracts [Member]
Summary of contracts for oil and natural gas
Fair Value of Asset (Liability)		$ (9,675)
Open costless collar contracts [Member] \| Oil - WTI [Member]
Summary of contracts for oil and natural gas
Derivative, Nonmonetary Notional Amount \| bbl	2,880,000
Price Floor \| $ / bbl	44.27
Price Ceiling \| $ / bbl	60.29
Fair Value of Asset (Liability)	$ (8,414)
Open costless collar contracts [Member] \| Oil - LLS [Member]
Summary of contracts for oil and natural gas
Derivative, Nonmonetary Notional Amount \| bbl	720,000
Price Floor \| $ / bbl	45.00
Price Ceiling \| $ / bbl	63.05
Fair Value of Asset (Liability)	$ (2,451)
Open costless collar contracts [Member] \| Natural Gas, Calculation Period One [Member]
Summary of contracts for oil and natural gas
Derivative, Nonmonetary Notional Amount \| MMBTU	16,800,000
Price Floor \| $ / MMBTU	2.58
Price Ceiling \| $ / MMBTU	3.67
Fair Value of Asset (Liability)	$ 1,190
Open Swap Contracts [Member]
Summary of contracts for oil and natural gas
Fair Value of Asset (Liability)	$ (5,564)
Open Swap Contracts [Member] \| Oil, Calculation Period Two [Member]
Summary of contracts for oil and natural gas
Derivative, Nonmonetary Notional Amount \| bbl	5,220,000
Fair Value of Asset (Liability)	$ (5,564)
Fixed price \| $ / bbl	(1.02)

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

Open costless collar contracts for oil and natural gas.

+ References

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

No definition available.

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958

Reference 2: 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

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13495-108611

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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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- Definition

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

+ References

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