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Leases - Schedule of Rent Expenses (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Leases [Abstract] |  |  |
Operating lease expense | $ 3,406 | $ 3,447 |
Variable and short-term lease expense | 192 | 76 |
Rent expense | $ 3,598 | $ 3,523 | $ 3,100

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

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- Definition Variable and short term lease expense. + References No definition available. + Details
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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_LeasesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of operating lease expense. Excludes sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 4 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479041/842-20-45-4 + Details
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Balance Type: | debit
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