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Stock-Based Compensation (Details) $ / shares in Units, $ in Thousands		1 Months Ended		3 Months Ended
		Feb. 28, 2018 stock_awards	Feb. 28, 2017 stock_awards	Mar. 31, 2018 USD ($) tranch $ / shares shares	Mar. 31, 2017 USD ($) 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	$ 7,900
Stock-based compensation expense | $				2,286	2,002
Tax benefit from compensation expense | $				600	800
Unrecognized compensation expense | $				$ 16,000
Unrecognized compensation, period for recognition				2 years 1 month
Performance Shares [Member]
Stock-Based Compensation [Abstract]
Stock-based compensation expense | $				$ 1,087	$ 921
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				(181,536)
Forfeited | shares				(4,451)
Outstanding, March 31, 2018 | shares				447,984
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				20.19
Forfeited | $ / shares				23.72
Outstanding, March 31, 2018 | $ / shares				$ 25.84
Restricted Stock Units (RSUs) [Member]
Stock-Based Compensation [Abstract]
Stock-based compensation expense | $				$ 1,199	$ 1,081
Number of shares [Abstract]
Outstanding, December 31, 2017 | shares				403,252
Granted | shares				98,375	208,888
Performance condition adjustment | shares				0
Vested | shares				(198,634)
Forfeited | shares				(3,547)
Outstanding, March 31, 2018 | shares				299,446
Weighted Average Grant Date Fair Value [Abstract]
Outstanding, December 31, 2017 | $ / shares				$ 23.06
Granted | $ / shares				43.05
Performance condition adjustment | $ / shares				0.00
Vested | $ / shares				23.48
Forfeited | $ / shares				22.98
Outstanding, March 31, 2018 | $ / shares				$ 29.35
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] Amount represents additional PSU's earned during the three months ended March 31, 2018, based on the performance condition adjustment, as other employees earned 145% of the target based 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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