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Long-Term Debt (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2010
Accounts, Notes, Loans and Financing Receivable    
Loans Payable $ 0.9us-gaap_LoansPayable $ 1.5us-gaap_LoansPayable
Employee Stock Ownership Plan (ESOP), Plan | Loans Receivable    
Accounts, Notes, Loans and Financing Receivable    
Loan, restructured outstanding debt of ESSOP   0.5bmi_NotesLoansAndFinancingReceivableRepayThirdPartyDebt
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis
= bmi_EmployeeStockOwnershipPlanEsopPlanMember
Purchase of company shares   1.0bmi_NotesLoansAndFinancingReceivablePurchaseOfCompanyShares
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis
= bmi_EmployeeStockOwnershipPlanEsopPlanMember
Loans Payable $ 0.9us-gaap_LoansPayable
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis
= bmi_EmployeeStockOwnershipPlanEsopPlanMember		 $ 1.5us-gaap_LoansPayable
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis
= bmi_EmployeeStockOwnershipPlanEsopPlanMember