Debt Instrument, Covenant, Available Liquidity, Minimum allowed

No definition available.

Name:	bcc_DebtInstrumentCovenantAvailableLiquidityMinimum
Namespace Prefix:	bcc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Debt Instrument, Covenant, Capitalization Ratio, Maximum allowed (as a percent)

+ References

No definition available.

+ Details

Name:	bcc_DebtInstrumentCovenantCapitalizationRatioMaximumasapercent
Namespace Prefix:	bcc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Debt Instrument, Covenant, Consolidated Net Worth minimum allowed

+ References

No definition available.

+ Details

Name:	bcc_DebtInstrumentCovenantConsolidatedNetWorthMinimum
Namespace Prefix:	bcc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The average effective interest rate during the reporting period, which includes the expected patronage credits.

+ References

No definition available.

+ Details

Name:	bcc_DebtInstrumentInterestRateDuringPeriodWithPatronageCredits
Namespace Prefix:	bcc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of commitment fees, as a percentage, for the unused borrowing capacity under the long-term financing arrangement that is available to the entity.

+ References

No definition available.

+ Details

Name:	bcc_DebtInstrumentUnusedBorrowingCapacityFeeasapercentage
Namespace Prefix:	bcc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Minimum fixed charge coverage ratio. If that percentage is met, there is no restriction upon the payment of dividend.

+ References

No definition available.

+ Details

Name:	bcc_Dividendrestrictionfixedchargecoverageratioasapercent
Namespace Prefix:	bcc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Minimum interest coverage ratio. If that percentage is met, there is no restriction upon the payment of dividends.

+ References

No definition available.

+ Details

Name:	bcc_Dividendrestrictioninterestcoverageratioasapercent
Namespace Prefix:	bcc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of Consecutive Quarters Within Which Maixmum Threshold Amount Of Capital Expenditures Applies.

+ References

No definition available.

+ Details

Name:	bcc_NumberofConsecutiveQuartersWithinWhichMaixmumThresholdAmountOfCapitalExpendituresApplies
Namespace Prefix:	bcc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Threshold of amount of capital expenditures made during four consecutive quarters, maximum

+ References

No definition available.

+ Details

Name:	bcc_Thresholdofamountofcapitalexpendituresmadeduringfourconsecutivequartersmaximum
Namespace Prefix:	bcc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Date the debt agreement requires the first payment to be made, in CCYY-MM-DD format.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823

+ Details

Name:	us-gaap_DebtInstrumentDateOfFirstRequiredPayment1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Description of the frequency of periodic payments (monthly, quarterly, annual).

+ References

+ Details

Name:	us-gaap_DebtInstrumentFrequencyOfPeriodicPayment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The average effective interest rate during the reporting period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentInterestRateDuringPeriod
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of the required periodic payments applied to principal.

+ References

+ Details

Name:	us-gaap_DebtInstrumentPeriodicPaymentPrincipal
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of unused borrowing capacity under the long-term financing arrangement that is available to the entity as of the balance sheet date.

+ References

+ Details

Name:	us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585

+ Details

Name:	us-gaap_RepaymentsOfLongTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	us-gaap_DebtInstrumentAxis=bcc_TermLoanDue2026Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_BaseRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Debt:Term Loan (Details) $ in Thousands	12 Months Ended
Debt:Term Loan (Details) $ in Thousands	Dec. 31, 2018 USD ($) Integer9	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Mar. 30, 2016 USD ($)
Debt Instrument [Line Items]
Repayments of Long-term Debt	$ 7,500	$ 410,400	$ 754,071
Term Loan Due 2026 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount				$ 75,000
Debt Instrument, Periodic Payment, Principal	$ 10,000
Debt Instrument, Date of First Required Payment	Mar. 30, 2022
Debt Instrument, Frequency of Periodic Payment	annual
Debt Instrument, Unused Borrowing Capacity, Amount			30,000
Debt Instrument, Unused Borrowing Capacity, Fee (as a percentage)	0.325%
Repayments of Long-term Debt			$ 30,000
Debt Instrument, Covenant, Capitalization Ratio, Maximum (as a percent)	60.00%
Debt Instrument, Covenant, Consolidated Net Worth, Minimum	$ 350,000
Debt Instrument, Covenant, Available Liquidity, Minimum	100,000
Threshold of amount of capital expenditures made during four consecutive quarters, maximum	$ 50,000
Number of Consecutive Quarters Within Which Maixmum Threshold Amount Of Capital Expenditures Applies \| Integer9	4
Dividend restriction, interest coverage ratio (as a percent)	300.00%
Dividend restriction, fixed-charge coverage ratio (as a percent)	100.00%
Debt Instrument, Interest Rate During Period	3.86%
Debt Instrument, Interest Rate During Period With Patronage Credits	3.10%
Term Loan Due 2026 [Member] \| London Interbank Offered Rate (LIBOR) [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Basis spread on variable interest rate	1.875%
Term Loan Due 2026 [Member] \| London Interbank Offered Rate (LIBOR) [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Basis spread on variable interest rate	2.125%
Term Loan Due 2026 [Member] \| Base Rate [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Basis spread on variable interest rate	0.875%
Term Loan Due 2026 [Member] \| Base Rate [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Basis spread on variable interest rate	1.125%