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Stock Compensation (Nonvested Stock) (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award      
Total stock compensation expense $ 1,400,000us-gaap_AllocatedShareBasedCompensationExpense $ 1,400,000us-gaap_AllocatedShareBasedCompensationExpense $ 1,300,000us-gaap_AllocatedShareBasedCompensationExpense
Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award      
Unrecognized compensation cost period (in months) 1 year 3 months 18 days    
Unrecognized compensation cost 1,300,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
   
Vesting period (in years) 3 years    
Restricted stock expense 1,000,000us-gaap_RestrictedStockExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
900,000us-gaap_RestrictedStockExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
900,000us-gaap_RestrictedStockExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
Omnibus Incentive Plan | Common Stock      
Share-based Compensation Arrangement by Share-based Payment Award      
Annual share award 50,000us-gaap_StockIssuedDuringPeriodValueOther
/ us-gaap_AwardTypeAxis
= us-gaap_CommonStockMember
/ us-gaap_PlanNameAxis
= bmi_OmnibusIncentivePlanMember
   
Total stock compensation expense 400,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_CommonStockMember
/ us-gaap_PlanNameAxis
= bmi_OmnibusIncentivePlanMember
400,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_CommonStockMember
/ us-gaap_PlanNameAxis
= bmi_OmnibusIncentivePlanMember
400,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_CommonStockMember
/ us-gaap_PlanNameAxis
= bmi_OmnibusIncentivePlanMember
Unrecognized compensation cost period (in months) 4 months    
Unrecognized compensation cost $ 100,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_CommonStockMember
/ us-gaap_PlanNameAxis
= bmi_OmnibusIncentivePlanMember