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Stock-Based Compensation (Details) $ / shares in Units, $ in Thousands		1 Months Ended		3 Months Ended		9 Months Ended		12 Months Ended
		Feb. 28, 2018 stock_awards	Feb. 28, 2017 stock_awards	Sep. 30, 2018 USD ($) $ / shares shares	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) tranch $ / shares shares	Sep. 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 | $						$ 15,400	$ 8,400
Stock-based compensation expense | $				$ 2,162	$ 2,488	6,893	6,931
Tax benefit from compensation expense | $						1,700	2,700
Unrecognized compensation expense | $				11,400		$ 11,400
Unrecognized compensation, period for recognition						1 year 9 months
Performance Shares [Member]
Stock-Based Compensation [Abstract]
Stock-based compensation expense | $				$ 945	1,297	$ 3,263	$ 3,312
Number of shares [Abstract]
Outstanding, December 31, 2017 | shares						487,160
Granted | shares						78,976	178,021
Performance condition adjustment (a) | shares	[1]					67,835
Vested | shares						(187,606)
Forfeited | shares						(14,027)
Outstanding, September 30, 2018 | shares				432,338		432,338		487,160
Weighted Average Grant Date Fair Value [Abstract]
Outstanding, December 31, 2017 | $ / shares						$ 20.76
Granted | $ / shares						43.05
Performance condition adjustment (a) | $ / shares	[1]					27.05
Vested | $ / shares						20.20
Forfeited | $ / shares						26.26
Outstanding, September 30, 2018 | $ / shares				$ 25.88		$ 25.88		$ 20.76
Restricted Stock Units (RSUs) [Member]
Stock-Based Compensation [Abstract]
Stock-based compensation expense | $				$ 1,217	$ 1,191	$ 3,630	$ 3,619
Number of shares [Abstract]
Outstanding, December 31, 2017 | shares						403,252
Granted | shares						99,087	214,035
Performance condition adjustment (a) | shares						0
Vested | shares						(199,414)
Forfeited | shares						(11,738)
Outstanding, September 30, 2018 | shares				291,187		291,187		403,252
Weighted Average Grant Date Fair Value [Abstract]
Outstanding, December 31, 2017 | $ / shares						$ 23.06
Granted | $ / shares						43.08
Performance condition adjustment (a) | $ / shares						0.00
Vested | $ / shares						23.47
Forfeited | $ / shares						26.13
Outstanding, September 30, 2018 | $ / shares				$ 29.47		$ 29.47		$ 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] Performance condition adjustment 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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