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Summary of Significant Accounting Policies:Vendor and Customer Rebates and Allowances (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Vendor and Customer Rebates and Allowances |  |
Vendor rebates and allowances | $ 6.7 | $ 7.0
Customer rebates payable | $ 45.5 | $ 31.6

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- Definition Vendor and customer rebates and allowances. + References No definition available. + Details
Name: | bcc_Bcc_VendorAndCustomerRebatesAndAllowancesAbstract
Namespace Prefix: | bcc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Accrued customer rebates and allowances as of the balance sheet date. + References No definition available. + Details
Name: | bcc_CustomerRebatesAndAllowances
Namespace Prefix: | bcc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Rebates and allowances receivable from the vendor as of the balance sheet date. + References No definition available. + Details
Name: | bcc_VendorRebatesAndAllowances
Namespace Prefix: | bcc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant