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Net Income Per Common Share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
1 Months Ended 3 Months Ended
Feb. 28, 2013
Mar. 31, 2015
Mar. 31, 2014
Net Income Per Common Share [Line Items]      
Weighted average number of diluted shares outstanding adjustment (in shares)   571,915us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment 1,322,272us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment
Adjustments to net income for purposes of computing income available to common stockholders   0b_AdjustmentsToNetIncomeForPurposesOfComputingIncomeAvailableToCommonStockholders 0b_AdjustmentsToNetIncomeForPurposesOfComputingIncomeAvailableToCommonStockholders
Stock Options [Member]      
Net Income Per Common Share [Line Items]      
Antidilutive securities excluded from computation of EPS   199,950us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
92,049us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
Options, granted (in shares) 122,700us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
   
Restricted Stock Units (RSUs) [Member]      
Net Income Per Common Share [Line Items]      
Other than options, granted (in shares) 106,685us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
   
Performance Share Awards [Member]      
Net Income Per Common Share [Line Items]      
Other than options, granted (in shares) 85,465us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= b_PerformanceShareAwardsMember
   
Award vesting period   3 years  
Minimum range of target award of stock plan   0.00%b_MinimumRangeOfTargetAwardOfStockPlan
/ us-gaap_AwardTypeAxis
= b_PerformanceShareAwardsMember
 
Maximum range of target award of stock plan   250.00%b_MaximumRangeOfTargetAwardOfStockPlan
/ us-gaap_AwardTypeAxis
= b_PerformanceShareAwardsMember