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Stock-Based Compensation (Details) $ / shares in Units, $ in Thousands		1 Months Ended		3 Months Ended		6 Months Ended		12 Months Ended
		Feb. 28, 2018 stock_awards	Feb. 28, 2017 stock_awards	Jun. 30, 2018 USD ($) $ / shares shares	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) tranch $ / shares shares	Jun. 30, 2017 USD ($) shares	Dec. 31, 2017 $ / shares shares
Stock-Based Compensation [Abstract]
Number of types of stock-based awards granted (in types) | stock_awards		2	2
Fair market value of awards | $						$ 15,200	$ 8,400
Stock-based compensation expense | $				$ 2,445	$ 2,441	4,731	4,443
Tax benefit from compensation expense | $						1,200	1,700
Unrecognized compensation expense | $				14,500		$ 14,500
Unrecognized compensation, period for recognition						1 year 11 months
Performance Shares [Member]
Stock-Based Compensation [Abstract]
Stock-based compensation expense | $				$ 1,231	1,094	$ 2,318	$ 2,015
Number of shares [Abstract]
Outstanding, December 31, 2017 | shares						487,160
Granted | shares						78,976	178,021
Performance condition adjustment | shares	[1]					67,835
Vested | shares						(181,638)
Forfeited | shares						(10,784)
Outstanding, June 30, 2018 | shares				441,549		441,549		487,160
Weighted Average Grant Date Fair Value [Abstract]
Outstanding, December 31, 2017 | $ / shares						$ 20.76
Granted | $ / shares						43.05
Performance condition adjustment | $ / shares	[1]					27.05
Vested | $ / shares						20.20
Forfeited | $ / shares						27.09
Outstanding, June 30, 2018 | $ / shares				$ 25.79		$ 25.79		$ 20.76
Restricted Stock Units (RSUs) [Member]
Stock-Based Compensation [Abstract]
Stock-based compensation expense | $				$ 1,214	$ 1,347	$ 2,413	$ 2,428
Number of shares [Abstract]
Outstanding, December 31, 2017 | shares						403,252
Granted | shares						99,087	209,697
Performance condition adjustment | shares						0
Vested | shares						(198,928)
Forfeited | shares						(9,203)
Outstanding, June 30, 2018 | shares				294,208		294,208		403,252
Weighted Average Grant Date Fair Value [Abstract]
Outstanding, December 31, 2017 | $ / shares						$ 23.06
Granted | $ / shares						43.08
Performance condition adjustment | $ / shares						0.00
Vested | $ / shares						23.48
Forfeited | $ / shares						27.08
Outstanding, June 30, 2018 | $ / shares				$ 29.39		$ 29.39		$ 23.06
Officer [Member]
Stock-Based Compensation [Abstract]
Performance Shares Target Percentage Earned, Officers								135.00%
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]
Performance Shares that could be awarded, as a percentage of ROIC target amount, minimum						0.00%
Performance Shares that could be awarded, as a percentage of ROIC target amount, maximum						200.00%
Officer [Member] | Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]
Vesting period (in years)						3 years
Other employees [Member]
Stock-Based Compensation [Abstract]
Performance Shares Target Percentage Earned, Other Employees								145.00%
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]
Performance Shares that could be awarded, as a percentage of EBITDA target amount, minimum						0.00%
Performance Shares that could be awarded, as a percentage of EBITDA target amount, maximum						200.00%
Other employees [Member] | Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]
Number of equal tranches for annual vesting (in tranches) | tranch						3
Officers and other employees [Member] | Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]
Number of equal tranches for annual vesting (in tranches) | tranch						3
Nonemployee Directors [Member] | Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]
Vesting period (in years)						1 year
[1] represents additional PSU's granted, as other employees earned 145% of the target based on Boise Cascade's 2017 EBITDA and officers earned 135% of the target based on Boise Cascade’s 2017 ROIC.

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The company's EBITDA exceed the performance target, thus participants earned a true-up related to their performance stock unit shares.

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Unrecognized cost of unvested share-based compensation awards.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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