v3.19.3

Asset Retirement Obligations (Details) - USD ($) $ in Thousands	1 Months Ended	5 Months Ended	6 Months Ended
	Feb. 08, 2018	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018	Feb. 08, 2018
Asset Retirement Obligation [Line Items]
Balance, beginning of period		$ 0	$ 11,552
Liabilities assumed in Business Combination		5,998	0
Liabilities incurred		877	634
Liabilities settled		(806)	(162)
Liabilities transferred in sale of properties		(20)	0
Revisions to estimates		665	(8)
Accretion expense		263	470
Balance, end of period		0	$ 11,552	$ 12,486	$ 11,552	$ 6,977	$ 0
Less: current portion				44	2,079	538
Long-term portion				$ 12,442	$ 9,473	$ 6,439
Predecessor
Asset Retirement Obligation [Line Items]
Balance, beginning of period	$ 10,469	10,509
Liabilities assumed in Business Combination	0
Liabilities incurred	0
Liabilities settled	(63)
Liabilities transferred in sale of properties	0
Revisions to estimates	63
Accretion expense	40
Balance, end of period	$ 10,469	$ 10,509					10,509
Less: current portion							33
Long-term portion							$ 10,476

Asset Retirement Obligation, Liabilities Assumed In Business Combination

+ References

No definition available.

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Balance Type:	credit
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- Definition

Asset Retirement Obligation, Liabilities Transferred In Sale of Properties

+ References

No definition available.

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Namespace Prefix:	amr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Asset Retirement Obligation [Line Items]

+ References

No definition available.

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Namespace Prefix:	amr_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

+ References

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)(3)
-URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6392676&loc=d3e7480-110848

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Current portion of the carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

+ References

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Balance Type:	credit
Period Type:	instant

- Definition

Amount of asset retirement obligations incurred during the period.

+ References

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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- Definition

Amount of asset retirement obligations settled, or otherwise disposed of, during the period. This may include asset retirement obligations transferred to third parties associated with the sale of a long-lived asset.

+ References

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of increase (decrease) in the asset retirement obligation from changes in the amount or timing of the estimated cash flows associated with the settlement of the obligation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 20
-Section 35
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=6392603&loc=d3e7123-110846

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)(4)
-URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849

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Balance Type:	credit
Period Type:	duration

- Definition

Noncurrent portion of the carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

+ References

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Alta Mesa Resources, Inc. /DE 10-Q