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Employee Benefit Plans (Amounts Recognized in the Consolidated Balance Sheet) (Details) (Other postretirement benefits, USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Defined Benefit Plans and Other Postretirement Benefit Plans    
Pension and Other Postretirement Defined Benefit Plans, Liabilities $ 6,767us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesCurrentAndNoncurrent $ 6,376us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesCurrentAndNoncurrent
Accrued compensation and employee benefits    
Defined Benefit Plans and Other Postretirement Benefit Plans    
Pension and Other Postretirement Defined Benefit Plans, Liabilities 425us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesCurrentAndNoncurrent
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
/ us-gaap_FairValueByLiabilityClassAxis
= bmi_AccruedCompensationAndEmployeeBenefitsMember		 442us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesCurrentAndNoncurrent
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
/ us-gaap_FairValueByLiabilityClassAxis
= bmi_AccruedCompensationAndEmployeeBenefitsMember
Accrued non-pension postretirement benefits    
Defined Benefit Plans and Other Postretirement Benefit Plans    
Pension and Other Postretirement Defined Benefit Plans, Liabilities $ 6,342us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesCurrentAndNoncurrent
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
/ us-gaap_FairValueByLiabilityClassAxis
= bmi_AccruedNonPensionPostretirementBenefitsMember		 $ 5,934us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesCurrentAndNoncurrent
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
/ us-gaap_FairValueByLiabilityClassAxis
= bmi_AccruedNonPensionPostretirementBenefitsMember