Asset Retirement Obligation (Details) - USD ($) $ in Thousands		1 Months Ended	5 Months Ended	6 Months Ended
Jan. 31, 2018	Feb. 08, 2019	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Changes to the Company's asset retirement obligation liability
Asset retirement obligation, beginning of period		$ 2,480	$ 2,486	$ 31,310
Liabilities incurred		0	20	7
Liabilities settled		(11)	(292)	(98)
Accretion expense		17	69	240
Revisions in estimates		0	1,839	(67)
Divestiture of oil and gas properties		0	0	(28,214)
Asset retirement obligation, end of period		2,486	4,122	3,178
Less: current portion of asset retirement obligation		(183)	(1,525)	(877)	$ (183)
Long-term asset retirement obligation		$ 2,303	$ 2,597	$ 2,301	$ 2,297
Gulf Of Mexico Properties
Changes to the Company's asset retirement obligation liability
Divestiture of oil and gas properties	$ (28,200)

Asset Retirement Obligation, Liabilities Related To Oil And Gas Properties Sold

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- 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.

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- 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

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-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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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.

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Amount of asset retirement obligations incurred during the period.

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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.

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- 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

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-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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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.

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