Fresh Start Accounting (Fair Value Other Assets) (Details 9) $ in Thousands	Sep. 18, 2020 USD ($)
Fresh-Start Adjustment [Line Items]
Fair value adjustment for CO2 and oil pipeline line-fill	$ (3,698)
Fresh value adjustments for escrow accounts	671
Fresh Start Adjustments
Fresh-Start Adjustment [Line Items]
Fair value adjustments to other assets	$ (3,027)

Amount of fresh-start adjustment to total other noncurrent assets.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 852
-SubTopic 10
-Section 50
-Paragraph 7
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=120604989&loc=SL2890621-112765

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 852
-SubTopic 10
-Section 55
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=84165509&loc=d3e56426-112766

Name:	us-gaap_FreshStartAdjustmentIncreaseDecreaseOtherAssetsNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant