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Commitments and Contingencies - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Commitments and Contingencies Disclosure [Abstract] |  |  |
Total rental expense charged to operations | $ 3,598 | $ 3,523 | $ 3,100

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- Definition Operating variable and short term lease expense. + References No definition available. + Details
Name: | bmi_OperatingVariableAndShortTermLeaseExpense
Namespace Prefix: | bmi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration