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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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- Definition The weighted average fair value of non-vested performance true-up awards on equity-based plans excluding options plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. + References No definition available. + Details
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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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