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Summary of Significant Accounting Policies (Inventories) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Obsolete Inventory Reserve      
Balance at beginning of year $ 4,236us-gaap_InventoryValuationReserves $ 2,880us-gaap_InventoryValuationReserves $ 2,680us-gaap_InventoryValuationReserves
Net additions charged to earnings 974bmi_ProvisionForObsoleteInventory 2,322bmi_ProvisionForObsoleteInventory 1,082bmi_ProvisionForObsoleteInventory
Disposals (1,896)bmi_ProvisionForObsoleteInventoryChargeOffs (966)bmi_ProvisionForObsoleteInventoryChargeOffs (882)bmi_ProvisionForObsoleteInventoryChargeOffs
Balance at end of year $ 3,314us-gaap_InventoryValuationReserves $ 4,236us-gaap_InventoryValuationReserves $ 2,880us-gaap_InventoryValuationReserves