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Commitments and Contingencies (Details) (USD $)
In Thousands, unless otherwise specified
 0 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2014
Dec. 16, 2013
Dec. 31, 2012
Operating leases        
Rent expense related to lease commitments $ 302us-gaap_OperatingLeasesRentExpenseNet $ 6,000us-gaap_OperatingLeasesRentExpenseNet $ 5,000us-gaap_OperatingLeasesRentExpenseNet $ 3,000us-gaap_OperatingLeasesRentExpenseNet
Operating Leases, Future Minimum Payments Due        
Operating leases, future minimum payments due   13,865us-gaap_OperatingLeasesFutureMinimumPaymentsDue [1]    
Operating leases, future minimum payments due, current   4,384us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent [1]    
Operating leases, future minimum payments, due in two years   3,801us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears [1]    
Operating leases, future minimum payments, due in three years   2,258us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears [1]    
Operating leases, future minimum payments, due in four years   1,269us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears [1]    
Operating leases, future minimum payments, due in five years   1,174us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears [1]    
Operating leases, future minimum payments, due after fifth year   979us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter [1]    
Recorded Unconditional Purchase Obligation and Operating Leases, Future Minimum Payments Due        
Unrecorded unconditional purchase obligation and operating leases, future minimum payments due   199,558bry_UnrecordedUnconditionalPurchaseObligationAndOperatingLeasesFutureMinimumPaymentsDue    
Unrecorded unconditional purchase obligation and operating leases, future minimum payments due, current   40,654bry_UnrecordedUnconditionalPurchaseObligationDueAndOperatingLeasesFutureMinimumPaymentsDueCurrent    
Unrecorded unconditional purchase obligation and operating leases, future minimum payments due in second year   39,689bry_UnrecordedUnconditionalPurchaseObligationDueAndOperatingLeasesFutureMinimumPaymentsDueWithSecondYear    
Unrecorded unconditional purchase obligation and operating leases, future minimum payments due in third year   35,675bry_UnrecordedUnconditionalPurchaseObligationDueAndOperatingLeasesFutureMinimumPaymentsDueWithThirdYear    
Unrecorded unconditional purchase obligation and operating leases, future minimum payments due in fourth year   25,241bry_UnrecordedUnconditionalPurchaseObligationDueAndOperatingLeasesFutureMinimumPaymentsDueWithFourthYear    
Unrecorded unconditional purchase obligation and operating leases, future minimum payments due in fifth year   23,701bry_UnrecordedUnconditionalPurchaseObligationDueAndOperatingLeasesFutureMinimumPaymentsDueWithinFifthYear    
Unrecorded unconditional purchase obligation and operating leases, future minimum payments due after fifth year   34,598bry_UnrecordedUnconditionalPurchaseObligationDueAndOperatingLeasesFutureMinimumPaymentsDueAfterFifthYear    
Other commitments        
Unrecorded Unconditional Purchase Obligation Payment Schedule        
Unrecorded unconditional purchase obligation due   5,294us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount
/ us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= us-gaap_PurchaseCommitmentMember		 [2]    
Unrecorded unconditional purchase obligation due, current   2,852us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversary
/ us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= us-gaap_PurchaseCommitmentMember		 [2]    
Unrecorded unconditional purchase obligation due in second year   2,442us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnSecondAnniversary
/ us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= us-gaap_PurchaseCommitmentMember		 [2]    
Unrecorded unconditional purchase obligation due in third year   0us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnThirdAnniversary
/ us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= us-gaap_PurchaseCommitmentMember		 [2]    
Unrecorded unconditional purchase obligation due in fourth year   0us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFourthAnniversary
/ us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= us-gaap_PurchaseCommitmentMember		 [2]    
Unrecorded unconditional purchase obligation due in fifth year   0us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFifthAnniversary
/ us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= us-gaap_PurchaseCommitmentMember		 [2]    
Unrecorded unconditional purchase obligation due after fifth year   0us-gaap_UnrecordedUnconditionalPurchaseObligationDueAfterFiveYears
/ us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= us-gaap_PurchaseCommitmentMember		 [2]    
Firm natural gas transportation contracts        
Unrecorded Unconditional Purchase Obligation Payment Schedule        
Unrecorded unconditional purchase obligation due   180,399us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount
/ us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= bry_FirmNaturalGasTransportationContractsMember		 [3]    
Unrecorded unconditional purchase obligation due, current   33,418us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversary
/ us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= bry_FirmNaturalGasTransportationContractsMember		 [3]    
Unrecorded unconditional purchase obligation due in second year   33,446us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnSecondAnniversary
/ us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= bry_FirmNaturalGasTransportationContractsMember		 [3]    
Unrecorded unconditional purchase obligation due in third year   33,417us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnThirdAnniversary
/ us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= bry_FirmNaturalGasTransportationContractsMember		 [3]    
Unrecorded unconditional purchase obligation due in fourth year   23,972us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFourthAnniversary
/ us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= bry_FirmNaturalGasTransportationContractsMember		 [3]    
Unrecorded unconditional purchase obligation due in fifth year   22,527us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFifthAnniversary
/ us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= bry_FirmNaturalGasTransportationContractsMember		 [3]    
Unrecorded unconditional purchase obligation due after fifth year   $ 33,619us-gaap_UnrecordedUnconditionalPurchaseObligationDueAfterFiveYears
/ us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= bry_FirmNaturalGasTransportationContractsMember		 [3]    
[1] Operating leases relate primarily to obligations associated with the Company’s office facilities, vehicles and rail cars.
[2] Other commitments relate primarily to cogeneration facility management services and equipment purchase obligations.
[3] The Company enters into certain firm commitments to transport natural gas production to market and to transport natural gas for use in the Company’s cogeneration and conventional steam generation facilities. The remaining terms of these contracts range from approximately one to nine years and require a minimum monthly charge regardless of whether the contracted capacity is used or not.