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Stock Plans (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]      
Contribution expense $ 5,213us-gaap_DefinedContributionPlanCostRecognized $ 4,780us-gaap_DefinedContributionPlanCostRecognized $ 5,319us-gaap_DefinedContributionPlanCostRecognized
Retirement Savings Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Employer match of employee contributions to Retirement Savings Plan 50.00%b_EmployerMatchOfEmployeeContributionsToRetirementSavingsPlan
/ b_StockPlansByTypeAxis
= b_RetirementSavingsPlanMember		    
Share-based compensation arrangement by share-based payment award, maximum salary percentage of employer match 6.00%b_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumSalaryPercentageOfEmployerMatch
/ b_StockPlansByTypeAxis
= b_RetirementSavingsPlanMember		    
Annual Retirement Contribution Percent 4.00%b_AnnualRetirementContributionPercent
/ b_StockPlansByTypeAxis
= b_RetirementSavingsPlanMember		    
Contribution expense $ 3,278us-gaap_DefinedContributionPlanCostRecognized
/ b_StockPlansByTypeAxis
= b_RetirementSavingsPlanMember		 $ 2,815us-gaap_DefinedContributionPlanCostRecognized
/ b_StockPlansByTypeAxis
= b_RetirementSavingsPlanMember		 $ 3,504us-gaap_DefinedContributionPlanCostRecognized
/ b_StockPlansByTypeAxis
= b_RetirementSavingsPlanMember
Shares held by Retirement Savings Plan 1,807,534b_SharesHeldByRetirementSavingsPlan
/ b_StockPlansByTypeAxis
= b_RetirementSavingsPlanMember