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Information on Business Segments Details 1 (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Segment Reporting Information [Line Items]    
Assets $ 2,023,637us-gaap_Assets $ 2,073,885us-gaap_Assets
Aerospace [Member]    
Segment Reporting Information [Line Items]    
Assets 653,984us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= b_AerospaceMember		 655,042us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= b_AerospaceMember
Industrial [Member]    
Segment Reporting Information [Line Items]    
Assets 1,236,666us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= b_IndustrialMember		 1,281,974us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= b_IndustrialMember
Other [Member]    
Segment Reporting Information [Line Items]    
Assets $ 132,987us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= b_OtherCorporateAssetsMember		 $ 136,869us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= b_OtherCorporateAssetsMember