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DERIVATIVES - NARRATIVE (Details) | Jun. 30, 2021 derivative
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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
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Namespace Prefix: | bcei_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration