STOCK-BASED COMPENSATION - OTHER THAN OPTIONS SPLIT CRITERION (Details) - Performance stock units - LTIP	9 Months Ended
Sep. 30, 2021
2021
STOCK-BASED COMPENSATION
TSR	100.00%
ROCE	0.00%
2020
STOCK-BASED COMPENSATION
TSR	67.00%
ROCE	33.00%
2019
STOCK-BASED COMPENSATION
TSR	50.00%
ROCE	50.00%

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Return On Average Capital Employed Criterion

No definition available.

Name:	bcei_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodReturnOnAverageCapitalEmployedCriterion
Namespace Prefix:	bcei_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration