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Derivative Instruments Derivative Instruments (Commodity Derivatives) (Details) (2015, Oil Derivative Instruments, Three-way collars (NYMEX WTI))
Dec. 31, 2014
MBbl
Derivative [Line Items]  
Annual Hedged Volume (in energy unit) 1,095invest_DerivativeNonmonetaryNotionalAmount
Short
  
Derivative [Line Items]  
Derivative, Floor Price 70.00us-gaap_DerivativeFloorPrice
/ us-gaap_DerivativeByNatureAxis
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/ bry_DerivativeByRiskAxis
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/ bry_DerivativesByAnnualHedgedVolumesAndPricesAxis
= bry_Year2015Member
/ us-gaap_PositionAxis
= us-gaap_ShortMember
Derivative, Cap Price 101.62us-gaap_DerivativeCapPrice
/ us-gaap_DerivativeByNatureAxis
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/ bry_DerivativeByRiskAxis
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/ bry_DerivativesByAnnualHedgedVolumesAndPricesAxis
= bry_Year2015Member
/ us-gaap_PositionAxis
= us-gaap_ShortMember
Long
  
Derivative [Line Items]  
Derivative, Floor Price 90.00us-gaap_DerivativeFloorPrice
/ us-gaap_DerivativeByNatureAxis
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/ bry_DerivativeByRiskAxis
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/ us-gaap_PositionAxis
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