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DERIVATIVES - NARRATIVE (Details)	Sep. 30, 2021 derivative
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Number of derivative instruments qualified as hedging instruments	0

X

- Definition

Represents number of derivative instruments qualified for hedging instruments.

+ References

No definition available.

+ Details

Name:	bcei_NumberOfDerivativeInstrumentsQualifiedForHedgingInstruments
Namespace Prefix:	bcei_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration