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Employee Benefit Plans (Amounts Included in Other Comprehensive Loss not Recognized in Net Periodic Benefit Cost) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Pension plans  
Defined Benefit Plans and Other Postretirement Benefit Plans  
Prior service cost $ 0bmi_AccumulatedOtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetOfTaxNetPriorServiceCost
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
Net actuarial loss 11,156bmi_AccumulatedOtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetOfTaxActuarialGainLoss
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
Other postretirement benefits  
Defined Benefit Plans and Other Postretirement Benefit Plans  
Prior service cost 6bmi_AccumulatedOtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetOfTaxNetPriorServiceCost
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
Net actuarial loss $ 314bmi_AccumulatedOtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetOfTaxActuarialGainLoss
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember