Boise Cascade (BCC) 10-K 24 Feb 20 2019 FY Annual report Financial data

Cover Page Cover Page

Cover Page Cover Page - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Feb. 14, 2020	Jun. 28, 2019
Cover page.
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2019
Document Transition Report	false
Entity File Number	001-35805
Entity Registrant Name	Boise Cascade Company
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	20-1496201
Entity Address, Address Line One	1111 West Jefferson Street
Entity Address, Address Line Two	Suite 300
Entity Address, City or Town	Boise
Entity Address, State or Province	ID
Entity Address, Postal Zip Code	83702-5389
City Area Code	208
Local Phone Number	384-6161
Title of 12(b) Security	Common Stock, $0.01 par value per share
Trading Symbol	BCC
Security Exchange Name	NYSE
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Public Float			$ 1,084
Entity Common Stock, Shares Outstanding		38,987,515
Documents Incorporated by Reference [Text Block]	Portions of the registrant’s Proxy Statement for its 2020 annual meeting of stockholders are incorporated by reference into Part III of this Form 10-K.
Entity Central Index Key	0001328581
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	FY
Amendment Flag	false

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Sales
Sales	$ 4,643,404	$ 4,995,290	$ 4,431,991
Costs and expenses
Materials, labor, and other operating expenses (excluding depreciation)	3,965,776	4,307,594	3,819,574
Depreciation and amortization	80,141	146,837	80,379
Selling and distribution expenses	390,739	363,138	327,220
General and administrative expenses	71,072	68,811	63,028
Loss (gain) on sale and curtailment of facilities	0	38,314	0
Other (income) expense, net	(783)	(1,442)	377
Total costs and expenses	4,506,945	4,923,252	4,290,578
Income from operations	136,459	72,038	141,413
Foreign currency exchange gain (loss)	449	(944)	720
Pension expense (excluding service costs)	(2,474)	(24,999)	(260)
Interest expense	(26,051)	(26,193)	(25,370)
Interest income	2,811	1,649	547
Change in fair value of interest rate swaps	(2,963)	551	538
Total nonoperating income (expense)	(28,228)	(49,936)	(23,825)
Income before income taxes	108,231	22,102	117,588
Income tax provision	(27,306)	(1,625)	(34,631)
Net Income	$ 80,925	$ 20,477	$ 82,957
Weighted average common shares outstanding:
Basic	39,039	38,932	38,623
Diluted	39,242	39,387	39,074
Net income per common share:
Basic	$ 2.07	$ 0.53	$ 2.15
Diluted	2.06	0.52	2.12
Dividends declared per common share	$ 1.37	$ 1.30	$ 0.07

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Comprehensive Income [Abstract]
Net Income	$ 80,925	$ 20,477	$ 82,957
Defined benefit pension plans
Actuarial gain (loss), net of tax of ($1,176), $3,598, and $1,792, respectively	(3,466)	10,580	5,275
Amortization of actuarial (gain) loss, net of tax of ($44), $380, and $651, respectively	(131)	1,117	1,035
Effects of settlements, net of tax of $341, $5,902, and $-, respectively	1,001	17,353	0
Other comprehensive income (loss), net of tax	(2,596)	29,050	6,310
Comprehensive income	$ 78,329	$ 49,527	$ 89,267

Consolidated Statements of Co_2

Consolidated Statements of Comprehensive Income Parenthetical - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Comprehensive Income [Abstract]
Actuarial gain (loss), tax	$ (1,176)	$ 3,598	$ 1,792
Amortization of actuarial (gain) loss, tax	(44)	380	651
Effects of settlements, tax	$ 341	$ 5,902	$ 0

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Current
Cash and cash equivalents	$ 285,237	$ 191,671
Receivables
Trade, less allowances of $591 and $1,062	215,894	214,338
Related parties	568	436
Other	15,184	14,466
Inventories	497,596	533,049
Prepaid expenses and other	8,285	31,818
Total current assets	1,022,764	985,778
Property and equipment, net	476,949	487,224
Operating lease right-of-use assets	64,228	0
Finance lease right-of-use assets	21,798	0
Timber deposits	12,287	12,568
Goodwill	60,382	59,159
Intangible assets, net	17,797	16,851
Deferred income taxes	7,952	8,211
Other assets	9,194	11,457
Total assets	1,693,351	1,581,248
Accounts payable
Trade	222,930	210,587
Related parties	1,624	1,070
Accrued liabilities
Compensation and benefits	83,943	87,911
Interest payable	6,723	6,748
Other	69,772	63,509
Total current liabilities	384,992	369,825
Debt
Long-term debt	440,544	439,428
Other
Compensation and benefits	45,586	41,283
Operating lease liabilities, net of current portion	58,029	0
Finance lease liabilities, net of current portion	23,419	0
Deferred income taxes	26,694	19,218
Other long-term liabilities	12,757	38,904
Total other liabilities	166,485	99,405
Commitments and contingent liabilities
Stockholders' equity
Preferred stock, $0.01 par value per share; 50,000 shares authorized, no shares issued and outstanding	0	0
Common stock, $0.01 par value per share; 300,000 shares authorized, 44,353 and 44,076 shares issued, respectively	444	441
Treasury stock, 5,367 shares at cost	(138,909)	(138,909)
Additional paid-in capital	533,345	528,654
Accumulated other comprehensive loss	(50,248)	(47,652)
Retained earnings	356,698	330,056
Total stockholders' equity	701,330	672,590
Total liabilities and stockholders' equity	$ 1,693,351	$ 1,581,248

Consolidated Balance Sheets Par

Consolidated Balance Sheets Parenthetical - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Trade receivables, allowances	$ 591	$ 1,062
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, authorized	50,000,000	50,000,000
Preferred stock, outstanding	0	0
Preferred stock, shares Issued	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, authorized	300,000,000	300,000,000
Common stock, issued	44,352,778	44,075,840
Treasury stock, shares	5,367,000	5,367,000

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash provided by (used for) operations
Net Income	$ 80,925	$ 20,477	$ 82,957
Items in net income not using (providing) cash
Depreciation and amortization, including deferred financing costs and other	82,377	148,937	82,321
Stock-based compensation	7,973	8,831	9,730
Pension expense	3,121	25,793	1,464
Deferred income taxes	9,025	(7,965)	8,117
Change in fair value of interest rate swaps	2,963	(551)	(538)
Loss on sale and curtailment of facilities (excluding severance)	0	37,331	0
Other	(353)	(1,688)	376
Decrease (increase) in working capital, net of acquisitions
Receivables	2,160	37,561	(41,778)
Inventories	40,176	(64,190)	(43,222)
Prepaid expenses and other	(132)	(500)	(887)
Accounts payable and accrued liabilities	5,212	(14,531)	68,124
Pension contributions	(5,238)	(26,081)	(2,193)
Income taxes payable	19,387	(4,186)	(14,292)
Other	(1,949)	4,373	1,388
Net cash provided by operations	245,647	163,611	151,567
Cash provided by (used for) investment
Expenditures for property and equipment	(82,720)	(79,987)	(75,450)
Acquisitions of businesses and facilities	(15,676)	(25,482)	0
Proceeds from sale of facilities	2,493	15,003	0
Proceeds from sales of assets and other	1,838	1,209	2,238
Net cash used for investment	(94,065)	(89,257)	(73,212)
Cash provided by (used for) financing
Borrowings of long-term debt, including revolving credit facility	5,500	7,500	410,400
Payments of long-term debt, including revolving credit facility	(5,500)	(7,500)	(410,400)
Treasury stock purchased	0	(4,930)	0
Dividends paid on common stock	(53,954)	(50,615)	(2,701)
Tax withholding payments for stock-based awards	(3,574)	(5,135)	(2,902)
Other	(488)	857	410
Net cash used for financing	(58,016)	(59,823)	(5,193)
Net increase in cash and cash equivalents	93,566	14,531	73,162
Balance at beginning of the period	191,671	177,140	103,978
Balance at end of the period	$ 285,237	$ 191,671	$ 177,140

Consolidated Statements of Stoc

Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Loss [Member]	Retained Earnings [Member]
Common stock, shares, issued at Dec. 31, 2016		43,520,000
Beginning Balance, net of taxes at Dec. 31, 2016	$ 580,004	$ 435	$ (133,979)	$ 515,410	$ (83,012)	$ 281,150
Treasury stock, shares at Dec. 31, 2016			5,167,000
Net Income	82,957					82,957
Other comprehensive income (loss)	6,310				6,310
Common stock issued, shares		228,000
Common stock issued, value	2	$ 2
Stock-based compensation	9,730			9,730
Common stock dividends	(2,760)					(2,760)
Tax withholding payments on stock-based awards	(2,902)			(2,902)
Proceeds from exercise of stock options	1,144			1,144
Other	64			168		(104)
Common stock, shares, issued at Dec. 31, 2017		43,748,000
Ending Balance, net of taxes at Dec. 31, 2017	674,549	$ 437	$ (133,979)	523,550	(76,702)	361,243
Treasury stock, shares at Dec. 31, 2017			5,167,000
Net Income	20,477					20,477
Other comprehensive income (loss)	29,050				29,050
Common stock issued, shares		328,000
Common stock issued, value	4	$ 4
Treasury stock, shares acquired			200,000
Treasury stock, acquired	(4,930)		$ (4,930)
Stock-based compensation	8,831			8,831
Common stock dividends	(51,664)					(51,664)
Tax withholding payments on stock-based awards	(5,135)			(5,135)
Proceeds from exercise of stock options	1,412			1,412
Other	$ (4)			(4)
Common stock, shares, issued at Dec. 31, 2018	44,075,840	44,076,000
Ending Balance, net of taxes at Dec. 31, 2018	$ 672,590	$ 441	$ (138,909)	528,654	(47,652)	330,056
Treasury stock, shares at Dec. 31, 2018	5,367,000		5,367,000
Net Income	$ 80,925					80,925
Other comprehensive income (loss)	(2,596)				(2,596)
Common stock issued, shares		277,000
Common stock issued, value	3	$ 3
Stock-based compensation	7,973			7,973
Common stock dividends	(54,283)					(54,283)
Tax withholding payments on stock-based awards	(3,574)			(3,574)
Proceeds from exercise of stock options	295			295
Other	$ (3)			(3)
Common stock, shares, issued at Dec. 31, 2019	44,352,778	44,353,000
Ending Balance, net of taxes at Dec. 31, 2019	$ 701,330	$ 444	$ (138,909)	$ 533,345	$ (50,248)	$ 356,698
Treasury stock, shares at Dec. 31, 2019	5,367,000		5,367,000

Consolidated Statements of St_2

Consolidated Statements of Stockholders' Equity Parenthetical - $ / shares

3 Months Ended

12 Months Ended

Dec. 31, 2019

Sep. 30, 2019

Jun. 30, 2019

Mar. 31, 2019

Dec. 31, 2018

Sep. 30, 2018

Jun. 30, 2018

Mar. 31, 2018

Dec. 31, 2017

Sep. 30, 2017

Jun. 30, 2017

Mar. 31, 2017

Dec. 31, 2019

Dec. 31, 2018

Dec. 31, 2017

Statement of Stockholders' Equity [Abstract]

Dividends declared per common share

$ 1.10

[1]

$ 0.09

$ 0.09

$ 0.09

$ 0.09

$ 1.07

[1]

$ 0.07

$ 0.07

$ 0.07

$ 0

$ 0

$ 0

$ 1.37

$ 1.30

$ 0.07

[1]

During each fourth quarter 2019 and third quarter 2018, our board of directors declared and paid a supplemental dividend of $1.00 per share of our common stock.

Nature of Operations and Basis

Nature of Operations and Basis of Presentation	12 Months Ended
	Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Nature of Operations and Basis of Presentation	Nature of Operations and Basis of Presentation Boise Cascade Company is a building products company headquartered in Boise, Idaho. Our operations began on October 29, 2004 (inception), when we acquired the forest products assets of OfficeMax, Incorporated. As used in these consolidated financial statements, the terms "Boise Cascade," "we," and "our" refer to Boise Cascade Company and its consolidated subsidiaries. We are one of the largest producers of engineered wood products (EWP) and plywood in North America and a leading United States (U.S.) wholesale distributor of building products. We operate our business using two reportable segments: (1) Wood Products, which primarily manufactures EWP and plywood, and (2) Building Materials Distribution, which is a wholesale distributor of building materials. For more information, see Note 17, Segment Information .

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2019
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Principles of Consolidation The consolidated financial statements include the accounts of Boise Cascade and its subsidiaries. Intercompany balances and transactions have been eliminated. Use of Estimates The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America (GAAP) requires management to make estimates and assumptions about future events. These estimates and the underlying assumptions affect the amounts of assets and liabilities reported, disclosures about contingent assets and liabilities, and reported amounts of revenues and expenses. Such estimates include the valuation of accounts receivable, inventories, goodwill, intangible assets, and other long-lived assets; legal contingencies; guarantee obligations; indemnifications; assumptions used in retirement, medical, and workers' compensation benefits; assumptions used in the determination of right-of-use assets and related lease liabilities; stock-based compensation; fair value measurements; income taxes; and vendor and customer rebates, among others. These estimates and assumptions are based on management's best estimates and judgment. Management evaluates its estimates and assumptions on an ongoing basis using historical experience and other factors, including the current economic environment, which management believes to be reasonable under the circumstances. We adjust such estimates and assumptions when facts and circumstances dictate. As future events and their effects cannot be determined with precision, actual results could differ significantly from these estimates. Changes in these estimates resulting from continuing changes in the economic environment will be reflected in the consolidated financial statements in future periods. Revenue Recognition Revenues are recognized when control of the promised goods or services is transferred to our customers, in an amount that reflects the consideration we expect to be entitled to in exchange for those goods or services. For additional information regarding our revenue recognition policies, see Note 3, Revenues . Cash and Cash Equivalents Cash equivalents consist of short-term investments that have a maturity of three months or less at the date of purchase. At December 31, 2019 and 2018 , the majority of our cash and cash equivalents were invested in money market funds that are broadly diversified and invested in high-quality, short-duration securities, including commercial paper, certificates of deposit, U.S. government agency securities, and similar instruments. We have significant amounts of cash and cash equivalents that are in excess of federally insured limits. Though we have not experienced any losses on our cash and cash equivalents to date and we do not anticipate incurring any losses, we cannot be assured that we will not experience losses on our cash and cash equivalents. Trade Accounts Receivables and Allowance for Doubtful Accounts Trade accounts receivable are stated at the amount we expect to collect. Trade accounts receivable do not bear interest. We make ongoing estimates relating to the collectibility of our accounts receivable and maintain a reserve for estimated losses resulting from the inability of our customers to meet their financial obligations to us. At December 31, 2019 and 2018 , we had $0.6 million and $1.1 million , respectively, recorded as allowances for doubtful accounts. In determining the amount of the reserve and in order to manage credit risk, we consider our historical level of credit losses, customer concentrations, and current economic trends and monitor the creditworthiness of significant customers based on ongoing credit evaluations. Our sales are principally to customers in the building products industry located in the U.S. and Canada. A significant portion of our sales are concentrated with a relatively small number of customers. In 2019 , our top ten customers represented approximately 40% of sales, with no customer accounting for 10% or more of total sales. At December 31, 2019 , receivables from two customers accounted for approximately 14% and 12% of total receivables. At December 31, 2018 , receivables from these two customers accounted for approximately 13% and 11% of total receivables. No other customer accounted for 10% or more of total receivables. Adjustments to the valuation allowance are charged to income. Trade accounts receivable balances that remain outstanding after we have used reasonable collection efforts are written off through a charge to the valuation allowance and a credit to accounts receivable. Although we have not experienced material credit losses in recent years, our actual future losses from uncollectible accounts may differ materially from our current estimates. As additional information becomes known, we may change our estimates. In the event we determine that a change in the reserve is appropriate, we will record a charge to "Selling and distribution expenses" in our Consolidated Statements of Operations in the period we make such a determination. Fair Value Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. The fair value hierarchy under GAAP gives the highest priority to quoted market prices (Level 1) and the lowest priority to unobservable inputs (Level 3). In general, and where applicable, we use quoted prices in active markets for identical assets or liabilities to determine fair value (Level 1). If quoted prices in active markets for identical assets or liabilities are not available to determine fair value, we use quoted prices for similar assets and liabilities or inputs that are observable either directly or indirectly (Level 2). If quoted prices for identical or similar assets are not available or are unobservable, we may use internally developed valuation models, whose inputs include bid prices, and third-party valuations utilizing underlying asset assumptions (Level 3). See Note 12, Retirement and Benefit Plans , for the fair value measurements of our defined benefit plans' assets. Financial Instruments Our financial instruments are cash and cash equivalents, accounts receivable, accounts payable, long-term debt, and interest rate swaps. Our cash is recorded at cost, which approximates fair value, and our cash equivalents are money market funds. As of December 31, 2019 and 2018 , we held $259.5 million and $160.4 million , respectively, in money market funds that are measured at fair value on a recurring basis using Level 1 inputs. The recorded values of accounts receivable and accounts payable approximate fair values based on their short-term nature. At December 31, 2019 and 2018 , the book value of our fixed-rate debt for each period was $350.0 million , and the fair value was estimated to be $364.7 million and $328.1 million , respectively. The difference between the book value and the fair value is derived from the difference between the period-end market interest rate and the stated rate of our fixed-rate, long-term debt. We estimated the fair value of our fixed-rate debt using quoted market prices of our debt in inactive markets (Level 2 inputs). The interest rate on our term loans is based on market conditions such as the London Interbank Offered Rate (LIBOR) or a base rate. Because the interest rate on the term loans is based on current market conditions, we believe that the estimated fair value of the outstanding balance on our term loans approximates book value. We are exposed to financial risks such as changes in commodity prices, interest rates, and foreign currency exchange rates. We employ a variety of practices to manage these risks, including operating and financing activities and, where deemed appropriate, the use of derivative instruments. As discussed in Note 16, Financial Instrument Risk , we use interest rate swaps to mitigate our variable interest rate exposure, the fair value of which is measured based on Level 2 inputs. Vendor Rebates and Allowances We receive rebates and allowances from our vendors under a number of different programs, including vendor marketing programs. At December 31, 2019 and 2018 , we had $9.2 million and $9.7 million , respectively, of vendor rebates and allowances recorded in "Receivables, Other" on the Consolidated Balance Sheets. Rebates and allowances received from our vendors are recognized as a reduction of "Materials, labor, and other operating expenses (excluding depreciation)" when the product is sold, unless the rebates and allowances are linked to a specific incremental cost to sell a vendor's product. Amounts received from vendors that are linked to specific selling and distribution expenses are recognized as a reduction of "Selling and distribution expenses" in the period the expense is incurred. Foreign Currency The functional currency for our operations outside the United States is the U.S. dollar. Nonmonetary assets and liabilities and related depreciation and amortization for these foreign operations are remeasured into U.S. dollars using historical exchange rates. Monetary assets and liabilities are remeasured into U.S. dollars using the exchange rates as of the Consolidated Balance Sheet date. Revenue and expense items are remeasured into U.S. dollars using an average exchange rate prevailing during the year. Leases Our lease accounting policies are described in Note 11, Leases . Income Taxes We account for income taxes under the asset and liability method. Deferred tax assets and liabilities are recognized for the future tax consequences attributable to temporary differences between the financial statement carrying amounts of existing assets and liabilities and respective tax bases and operating loss and tax credit carryforwards, as measured using enacted tax rates expected to be in effect in the periods where temporary differences are expected to be realized or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date. We recognize deferred tax assets to the extent that we believe that these assets are more likely than not to be realized. In making such a determination, we consider all available positive and negative evidence, including future reversals of existing taxable temporary differences, projected future taxable income, tax-planning strategies, and results of recent operations. If we determine that we would be unable to realize our deferred tax assets in the future, we would make an adjustment to the deferred tax asset valuation allowance, which would increase the provision for income taxes. We review and update our tax positions as necessary to add any new uncertain tax positions taken, or to remove previously identified uncertain positions that have been adequately resolved. Additionally, uncertain positions may be remeasured as warranted by changes in facts or law. Accounting for uncertain tax positions requires estimating the amount, timing and likelihood of ultimate settlement. Although we believe that these estimates are reasonable, actual results could differ from these estimates. Inventory Valuation Inventories are valued at the lower of cost or net realizable value. Cost is based on the first-in, first-out (FIFO) method of inventory valuation or average cost. Wholesale distribution inventories include costs incurred in bringing inventory to its existing location. Manufactured inventories include costs for materials, labor, and factory overhead. Log inventories include costs to harvest and deliver the logs. Inventories included the following (work in process is not material): December 31, December 31, (thousands) Finished goods and work in process $ 413,020 $ 441,774 Logs 45,574 54,301 Other raw materials and supplies 39,002 36,974 $ 497,596 $ 533,049 Property and Equipment Property and equipment are recorded at cost. Cost includes expenditures for major improvements and replacements and the amount of interest cost associated with significant capital additions. For the years ended December 31, 2019 , 2018 , and 2017 , an insignificant amount of interest was capitalized. We expense all repair and maintenance costs as incurred. When property and equipment are retired, sold, or otherwise disposed of, the asset's carrying amount and related accumulated depreciation are removed from the accounts and any gain or loss is included in income (loss). We use the straight-line method of depreciation. Property and equipment consisted of the following asset classes with the following general range of estimated useful lives: December 31, December 31, General Range of Estimated Useful Lives in Years (thousands) Land $ 39,304 $ 38,888 Buildings (a) 140,008 164,878 20 - 40 Improvements 61,187 49,509 10 - 15 Mobile equipment, information technology, and office furniture 165,445 150,712 3 - 7 Machinery and equipment 666,467 629,337 7 - 12 Construction in progress 34,846 31,015 1,107,257 1,064,339 Less accumulated depreciation (630,308 ) (577,115 ) $ 476,949 $ 487,224 ___________________________________ (a) As of December 31, 2018, capital lease assets were included in the "Buildings" asset class. For additional information related to leases, see Note 11, Leases . Long-Lived Asset Impairment We review long-lived assets for impairment when events or changes in circumstances indicate that the carrying amount of assets may not be recoverable (triggering event). An impairment of long-lived assets exists when the carrying value is not recoverable through future undiscounted cash flows from operations and when the carrying value of an asset or asset group exceeds its fair value. No triggering event was identified during the year ended December 31, 2019. For a description of the impairment losses recorded during the year ended December 31, 2018, see Note 7, Sale of Manufacturing Facilities . Goodwill and Intangible Assets Impairment We maintain two reporting units for purposes of our goodwill impairment testing, Wood Products and Building Materials Distribution, which are the same as our operating segments discussed in Note 17, Segment Information . We test goodwill in each of our reporting units and intangible assets with indefinite lives for impairment annually in the fourth quarter or sooner if events or changes in circumstances indicate that the carrying value of the asset may exceed fair value. We also evaluate the remaining useful lives of our finite-lived purchased intangible assets to determine whether any adjustments to the useful lives are necessary. We completed our annual assessment of goodwill in fourth quarter 2019 using a qualitative approach. The qualitative goodwill impairment assessment requires evaluating factors, based on the weight of evidence, to determine whether a reporting unit's carrying value would more likely than not exceed its fair value. As part of our goodwill qualitative testing process for each reporting unit, we evaluate various factors that are specific to the reporting unit as well as industry and macroeconomic factors in order to determine whether it is reasonably likely to have a material impact on the fair value of our reporting units. Based on the qualitative analysis performed in 2019 , we concluded that there were no changes that were reasonably likely to cause the fair value of the reporting units to be less than the reporting units' carrying value and determined that there was no impairment of our goodwill. In the event we were to determine that a reporting unit's carrying value would more likely than not exceed its fair value, quantitative testing would be performed comparing carrying values to estimated fair values. See Note 9, Goodwill and Intangible Assets , for additional information. Asset Retirement Obligations We recognize our asset retirement obligations in the period in which they are incurred if sufficient information is available to reasonably estimate the fair value of the obligation. Fair value estimates are determined using Level 3 inputs in the fair value hierarchy. The fair values of our asset retirement obligations are measured using expected future cash outflows discounted using the company's credit-adjusted risk-free interest rate. When we record the liability, we capitalize the cost by increasing the carrying amount of the related long-lived asset. Over time, the liability is accreted to its settlement value, and the capitalized cost is depreciated over the useful life of the related asset. Upon settlement of the liability, we will recognize a gain or loss for any difference between the settlement amount and the liability recorded. At December 31, 2019 and 2018 , we had $2.2 million and $2.1 million , respectively, of asset retirement obligations recorded in "Other long-term liabilities" on our Consolidated Balance Sheets. At December 31, 2019 , these liabilities related primarily to landfill closure costs. The liabilities are based on the best estimate of current costs and are updated periodically to reflect current technology, laws and regulations, inflation, and other economic factors. We do not have any assets legally restricted for purposes of settling asset retirement obligations. We have additional asset retirement obligations with indeterminate settlement dates. The fair value of these asset retirement obligations cannot be estimated due to the lack of sufficient information to estimate the settlement dates of the obligations. These asset retirement obligations include, for example, (i) removal and disposal of potentially hazardous materials on equipment and/or an operating facility if the equipment and/or facility were to undergo major maintenance, renovation, or demolition; (ii) retention ponds that may be required to be drained and/or cleaned if the related operating facility is closed; and (iii) storage sites or owned facilities for which removal and/or disposal of chemicals and other related materials are required if the operating facility is closed. We will recognize a liability in the period in which sufficient information becomes available to reasonably estimate the fair value of these obligations. Pension Benefits Several estimates and assumptions are required to record pension costs and liabilities, including discount rates, expected return on plan assets, expected rate of compensation increases, retirement and mortality rates, expected contributions, and other factors. We review and update these assumptions annually unless a plan curtailment or other event occurs requiring that we update the estimates on an interim basis. See Note 12, Retirement and Benefit Plans , for additional information related to our pension plan. While we believe that the assumptions used to measure our pension obligations are reasonable, differences in actual experience or changes in assumptions may materially affect our pension obligations and future expense. Deferred Software Costs We defer internal-use software costs that benefit future years. These costs are amortized using the straight-line method over the expected life of the software, typically three to five years . "Other assets" in the Consolidated Balance Sheets includes $4.6 million of deferred software costs at each December 31, 2019 and 2018 . For each of the years ended December 31, 2019 , 2018 , and 2017 , we amortized $2.0 million of deferred software costs. Labor Concentration and Unions As of December 31, 2019 , we had approximately 6,020 employees. Approximately 23% of these employees work pursuant to collective bargaining agreements. As of December 31, 2019 , we had ten collective bargaining agreements. Five agreements, covering approximately 450 employees at our Elgin plywood plant, Kettle Falls plywood plant, and Woodinville BMD facility, are set to expire on May 31, 2020. Another agreement, covering approximately 35 employees at our Vancouver BMD facility, is set to expire on December 31, 2020. During the course of negotiations, if these agreements are not renewed or extended upon their termination, we could experience a material labor disruption, strike, or significantly increased labor costs at one or more of our facilities, which could prevent us from meeting customer demand or reduce our sales and profitability. Self-Insurance We are self-insured for certain losses related to workers' compensation and medical claims, general and auto liability, as well as property and business interruption losses. The expected ultimate costs for claims incurred are recognized as liabilities in the Consolidated Balance Sheets and are estimated based principally on an analysis of historical claims data and estimates of claims incurred but not reported. Losses are accrued and charged to operations when it is probable that a loss has been incurred and the amount can be reasonably estimated. We maintain third-party stop-loss insurance policies to cover these liability costs in excess of predetermined retained amounts. Costs related to the administration of the plans and related claims are expensed as incurred. At December 31, 2019 and 2018 , self-insurance related liabilities of $9.9 million and $10.0 million , respectively, were classified within "Accrued liabilities," and $10.0 million and $9.5 million , respectively, were classified within "Other long-term liabilities" on our Consolidated Balance Sheets. New and Recently Adopted Accounting Standards In December 2019, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes , which is intended to reduce complexity in accounting for income taxes. This ASU removes certain exceptions to the general principles in Topic 740 and also clarifies and amends existing guidance to improve consistent application. The updated guidance is effective for interim and annual reporting periods beginning after December 15, 2020, with early adoption permitted. We are currently evaluating the effects of this ASU on our consolidated financial statements. In August 2018, the FASB issued ASU 2018-15, Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40): Customer's Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract . This ASU provides guidance on implementation costs incurred in a cloud computing arrangement (CCA) that is a service contract. The guidance aligns the accounting for such costs with the guidance on capitalizing costs associated with developing or obtaining internal-use software. Specifically, the ASU amends ASC 350 to include in its scope implementation costs of a CCA that is a service contract and clarifies that a customer should apply ASC 350-40 to determine which implementation costs should be capitalized in such a CCA. The updated guidance is effective for interim and annual reporting periods beginning after December 15, 2019. We do not expect this guidance to have a material effect on our consolidated financial statements. In August 2018, the FASB issued ASU 2018-14, Compensation - Retirement Benefits - Defined Benefit Plans - General (Topic 715-20): Disclosure Framework - Changes to the Disclosure Requirements for Defined Benefit Plans . This ASU amends ASC 715 to remove disclosures that are no longer considered cost beneficial, clarifies the specific requirements of disclosures, and adds disclosure requirements identified as relevant related to defined benefit pension and other postretirement plans. The ASU's changes related to disclosures are part of the FASB's disclosure framework project. The updated guidance is effective retrospectively for annual reporting periods ending after December 15, 2020, with early adoption permitted. We are currently evaluating the effects of this ASU on our disclosures in the notes to our consolidated financial statements. In August 2018, the FASB issued ASU 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement . This ASU amends ASC 820 to remove disclosures that are no longer considered cost beneficial, clarifies the specific requirements of disclosures, and adds disclosure requirements identified as relevant related to recurring and nonrecurring fair value measurements. The ASU's changes related to disclosures are part of the FASB's disclosure framework project. The updated guidance is effective for interim and annual reporting periods beginning after December 15, 2019. We do not expect this guidance to have a material effect on our disclosures in the notes to our consolidated financial statements. In June 2016, the FASB issued ASU 2016-13, Financial Instruments - Credit Losses (Topic 326) . This ASU sets forth a "current expected credit loss" (CECL) model which requires the measurement of all expected credit losses for financial instruments or other assets (e.g. trade receivables), held at the reporting date based on historical experience, current conditions, and reasonable supportable forecasts. This replaces the existing incurred loss model and is applicable to the measurement of credit losses on financial assets measured at amortized cost and applies to some off-balance sheet credit exposures. ASU 2016-13 also requires enhanced disclosures to help financial statement users better understand significant estimates and judgments used in estimating credit losses, as well as the credit quality and underwriting standards of an entity's portfolio. This ASU is effective for annual reporting periods ending after December 15, 2019, using a modified retrospective approach. The adoption of this standard in fourth quarter of 2019 did not have a material effect on our consolidated financial statements. In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842) . This amendment requires a lessee to recognize a right-of-use (ROU) asset and an associated lease liability on the balance sheet for all leases (whether operating or finance leases) with a term longer than 12 months. For leases defined as finance leases under the new standard, the lessee subsequently recognizes interest expense and amortization of the ROU asset, similar to accounting for capital leases under the previous lease standard. For leases defined as operating leases under the new standard, the lessee subsequently recognizes straight-line lease expense over the life of the lease. We adopted this standard effective January 1, 2019. The new lease standard had a material impact on our consolidated balance sheets, but did not have a material impact on our consolidated statements of operations or cash flows. The most significant impact was the recognition of ROU assets and lease liabilities for operating leases. See Note 11, Leases , for additional information on the impact of this standard on our accounting for leases and additional required qualitative disclosures of our lease policies. There were no other accounting standards recently issued that had or are expected to have a material impact on our consolidated financial statements and associated disclosures. Reclassifications

Revenues

Revenues	12 Months Ended
	Dec. 31, 2019
Revenue from Contract with Customer [Abstract]
Revenue	Revenues Adoption of ASC Topic 606, "Revenue from Contracts with Customers" On January 1, 2018, we adopted Topic 606 using the modified retrospective method applied to those contracts which were not completed as of January 1, 2018. Results for reporting periods beginning after January 1, 2018, are presented under Topic 606, while prior period amounts are not adjusted and continue to be reported in accordance with our historic accounting under Topic 605. There was no cumulative effect adjustment recorded to opening retained earnings as of January 1, 2018, upon adoption of Topic 606. However, the new revenue standard provided new guidance that resulted in reclassifications between "Sales" and "Materials, labor, and other operating expenses (excluding depreciation)" and "Selling and distribution expenses" for certain byproduct sales and restocking fees previously netted against these costs. The impact of the reclassifications to revenues and expenses for the year ended December 31, 2018 was an increase of $26.5 million as a result of applying Topic 606. Wood Products Segment Our Wood Products segment manufactures EWP, consisting of laminated veneer lumber (LVL), I-joists, and laminated beams, which are structural products used in applications where extra strength and consistent quality are required, such as headers and beams. LVL is also used in the manufacture of I-joists, which are assembled by combining a vertical web of oriented strand board (OSB) with top and bottom LVL or solid wood flanges. In addition, we manufacture structural, appearance, and industrial plywood panels. Our wood products are used primarily in new residential construction, residential repair-and-remodeling markets, and light commercial construction. The majority of our wood products are sold to leading wholesalers (including our Building Materials Distribution segment), home improvement centers, retail lumberyards, and industrial converters. For EWP, plywood and veneer, byproducts, and other products, we transfer control and recognize a sale when we ship the product from our manufacturing facility to our customer. Control transfers when product is shipped because the customer has legal title, a present obligation to pay, and risk and rewards of ownership. The amount of consideration we receive and revenue we recognize varies with changes in rebates and cash discounts we offer to our customers. See "Rebates and Cash Discounts" below. Building Materials Distribution Segment Our Building Materials Distribution segment is a leading national stocking wholesale distributor of building materials. We distribute a broad line of building materials, including OSB, plywood, and lumber (collectively referred to as commodities); general line items such as siding, composite decking, doors, metal products, insulation, and roofing; and EWP. Except for EWP, we purchase most of these building materials from third-party suppliers and market them primarily to retail lumberyards, home improvement centers, and specialty distributors that then sell the products to the final end customers, who are typically professional builders, independent contractors, and homeowners engaged in residential construction projects. Substantially all of Building Materials Distribution's EWP is sourced from our Wood Products segment. We sell products using two primary distribution methods: warehouse sales and direct sales. Warehouse sales are distributed from our warehouses to our customers. Direct sales are shipped from the manufacturer to the customer without us taking physical possession of inventory. We report direct sales on a gross basis, that is, the amounts billed to our customers are recorded as "Sales," and inventory purchased from manufacturers are recorded as "Materials, labor, and other operating expenses (excluding depreciation)." We are the principal of direct sales because we control the inventory, as we have the ability to direct its use before it is transferred to our customers. For warehouse sales, we transfer control and recognize a sale when the customer takes physical possession of the product. Control transfers when the customer takes physical possession of the product because the customer has legal title, a present obligation to pay, and risk and rewards of ownership. For direct sales, we transfer control and recognize a sale when the product is shipped from the manufacturer to the customer. Control transfers when product is shipped because the customer has legal title, a present obligation to pay, and risk and rewards of ownership. The amount of consideration we receive and revenue we recognize varies with changes in customer rebates and cash discounts we offer to our customers. See "Rebates and Cash Discounts" below. Rebates and Cash Discounts Rebates are provided to our customers and our customers' customers based on the volume of their purchases, among other factors such as customer loyalty, conversion, and commitment. We provide the rebates to increase the sell-through of our products. Rebates are generally estimated based on the expected amount to be paid and recorded as a decrease in "Sales." At December 31, 2019 and 2018 , we had $49.4 million and $52.1 million , respectively, of rebates payable to our customers recorded in "Accrued liabilities, Other" on our Consolidated Balance Sheets. We estimate the expected cash discounts based on an analysis of historical experience and record cash discounts as a decrease in "Sales." We adjust our estimate of revenue at the earlier of when the probability of rebates paid and cash discounts provided changes or when the amounts become fixed. There have not been and we believe that there will not be significant changes to our estimates of variable consideration. Shipping and Handling Fees for shipping and handling charged to customers for sales transactions are included in "Sales" in our Consolidated Statements of Operations. When control over products has transferred to the customer, we have elected to recognize costs related to shipping and handling as fulfillment costs. For our Wood Products segment, costs related to shipping and handling are included in "Materials, labor, and other operating expenses (excluding depreciation)" in our Consolidated Statements of Operations. In our Wood Products segment, we view our shipping and handling costs as a cost of the manufacturing process and the movement of product to our end customers. For our Building Materials Distribution segment, costs related to shipping and handling of $169.2 million , $156.5 million , and $139.4 million for the years ended December 31, 2019 , 2018 , and 2017 , respectively, are included in "Selling and distribution expenses" in our Consolidated Statements of Operations. In our Building Materials Distribution segment, our activities relate to the purchase and resale of finished product, and excluding shipping and handling costs from “Materials, labor, and other operating expenses (excluding depreciation)” provides us a clearer view of our operating performance and the effectiveness of our sales and purchasing functions. Other Our payment terms vary by the type of customer and the products offered. The term between invoicing and when payment is due is not significant. Sales, value add, and other taxes we collect concurrent with revenue-producing activities are excluded from revenue. We expense sales commissions when incurred as they are earned when the product is shipped. These costs are recorded within "Selling and distribution expenses." For revenue disaggregated by major product line for each reportable segment, see Note 17, Segment Information

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes Income Tax Provision Income before income taxes includes the following components: Year Ended December 31 2019 2018 2017 (thousands) Domestic $ 105,341 $ 21,704 $ 115,083 Foreign 2,890 398 2,505 Income before income taxes $ 108,231 $ 22,102 $ 117,588 The income tax provision shown in the Consolidated Statements of Operations includes the following: Year Ended December 31 2019 2018 2017 (thousands) Current income tax provision (benefit) Federal $ 13,700 $ 6,459 $ 22,541 State 4,574 3,126 3,973 Foreign 7 5 — Total current 18,281 9,590 26,514 Deferred income tax provision (benefit) Federal 7,430 (5,987 ) 6,747 State 925 (2,127 ) 991 Foreign 670 149 379 Total deferred 9,025 (7,965 ) 8,117 Income tax provision $ 27,306 $ 1,625 $ 34,631 The effective tax rate varies from the U.S. Federal statutory income tax rate principally due to the following: Year Ended December 31 2019 2018 2017 (thousands, except percentages) Income before income taxes $ 108,231 $ 22,102 $ 117,588 Statutory U.S. income tax rate (a) 21.0 % 21.0 % 35.0 % Statutory tax provision $ 22,728 $ 4,642 $ 41,156 State taxes 4,390 741 3,719 Domestic production activities deduction — — (963 ) Unrecognized tax benefits (178 ) (181 ) (86 ) Benefit from enactment of the Tax Act (b) — (3,806 ) (8,129 ) Tax credits (725 ) (272 ) (912 ) Foreign rate differential 71 432 (366 ) Share-based compensation (532 ) (1,718 ) (413 ) Nondeductible executive compensation 852 366 — Meals and entertainment 738 886 663 Other (38 ) 535 (38 ) Total $ 27,306 $ 1,625 $ 34,631 Effective income tax rate 25.2 % 7.4 % 29.5 % ______________________________________ (a) On December 22, 2017, the Tax Cuts and Jobs Act (the “Tax Act”), was enacted by the U.S. government. The most significant impact to our financial statements was the reduction of the corporate federal income tax rate from 35% to 21% . (b) As of December 31, 2018, we completed our assessment of the effects of the Tax Act on our financial statements. In connection with our analysis of the Tax Act, we recorded discrete tax benefits of $3.8 million and $8.1 million , respectively, during the years ended December 31, 2018 and 2017. The $3.8 million reduction in income tax expense resulted from the remeasurement of deferred income taxes to the new federal statutory rate of 21% , which mostly relates to a $20.0 million discretionary pension contribution made during 2018, for which we received a tax deduction at the 2017 federal income tax rate. The $8.1 million reduction in income tax expense resulted from the remeasurement of deferred income taxes to the new federal statutory rate of 21% . During the year ended December 31, 2019 , refunds received, net of cash taxes paid was $1.4 million . During the years ended December 31, 2018 and 2017 , cash paid for taxes, net of refunds received, was $14.5 million and $36.1 million , respectively. Deferred income taxes reflect the net tax effects of temporary differences between the carrying amount of assets and liabilities for financial reporting purposes and the amounts for income tax purposes. The components of our net deferred tax assets and liabilities at December 31, 2019 and 2018 , are summarized as follows: December 31, 2019 December 31, 2018 (thousands) Deferred tax assets Employee benefits $ 26,914 $ 27,149 Lease liabilities 23,241 — Capital leases — 5,742 Inventories 3,358 2,649 Foreign net operating loss carryforward 1,514 3,108 Other 6,256 6,461 Net deferred tax assets $ 61,283 $ 45,109 Deferred tax liabilities Property and equipment $ (50,751 ) $ (48,302 ) Right-of-use assets (21,753 ) — Intangible assets and other (5,924 ) (5,369 ) Other (1,597 ) (2,445 ) Deferred tax liabilities $ (80,025 ) $ (56,116 ) Total deferred tax liabilities, net $ (18,742 ) $ (11,007 ) As of December 31, 2019 , we have foreign net operating loss carryforwards of $10.4 million , which if unused, will expire in years 2031 through 2036. We have state income tax credits totaling $1.3 million as of December 31, 2019 , which if unused will expire in years 2020 through 2032. The foreign net operating loss and state credit carryforwards in the income tax returns filed included unrecognized tax benefits. The deferred tax assets recognized for those net operating loss and state credit carryforwards are presented net of these unrecognized tax benefits. Income Tax Uncertainties The following table summarizes the changes related to our gross unrecognized tax benefits excluding interest and penalties: 2019 2018 2017 (thousands) Balance as of January 1 $ 1,850 $ 2,083 $ 2,224 Increases related to prior years' tax positions — 13 1 Increases related to current year tax positions 53 — 51 Decreases related to prior years' tax positions — (43 ) (12 ) Lapse of statute of limitations (218 ) (203 ) (181 ) Balance as of December 31 $ 1,685 $ 1,850 $ 2,083 As of December 31, 2019 , 2018 , and 2017 , we had $1.7 million , $1.9 million , and $2.1 million , respectively, of unrecognized tax benefits recorded on our Consolidated Balance Sheets, excluding interest and penalties. Of the total unrecognized tax benefits recorded, $1.7 million , $1.8 million , and $2.0 million (net of the federal benefit for state taxes), respectively, would impact the effective tax rate if recognized. We recognize interest and penalties related to uncertain tax positions as income tax expense in our Consolidated Statements of Operations. For the years ended December 31, 2019 , 2018 , and 2017 , we recognized an insignificant amount of interest and penalties related to taxes. We recognize tax liabilities and adjust these liabilities when our judgment changes as a result of the evaluation of new information not previously available or as new uncertainties occur. We do not expect the unrecognized tax benefits to change significantly over the next twelve months.

Net Income Per Common Share

Net Income Per Common Share	12 Months Ended
	Dec. 31, 2019
Earnings Per Share [Abstract]
Net Income Per Common Share	Net Income Per Common Share Basic net income per common share is computed by dividing net income by the weighted average number of common shares outstanding during the period. Weighted average common shares outstanding for the basic net income per common share calculation includes certain vested restricted stock units (RSUs) and performance stock units (PSUs) as there are no conditions under which those shares will not be issued. For more information about common share activity during the period, see Note 14, Stockholders' Equity . Diluted net income per common share is computed by dividing net income by the combination of the weighted average number of common shares outstanding during the period and other potentially dilutive weighted average common shares. Other potentially dilutive weighted average common shares include the dilutive effect of stock options, RSUs, and PSUs for each period using the treasury stock method. Under the treasury stock method, the exercise price of a share and the amount of compensation expense, if any, for future service that has not yet been recognized are assumed to be used to repurchase shares in the current period. The following table sets forth the computation of basic and diluted net income per common share: Year Ended December 31 2019 2018 2017 (thousands, except per-share data) Net income $ 80,925 $ 20,477 $ 82,957 Weighted average common shares outstanding during the period (for basic calculation) 39,039 38,932 38,623 Dilutive effect of other potential common shares 203 455 451 Weighted average common shares and potential common shares (for diluted calculation) 39,242 39,387 39,074 Net income per common share - Basic $ 2.07 $ 0.53 $ 2.15 Net income per common share - Diluted $ 2.06 $ 0.52 $ 2.12 The computation of the dilutive effect of other potential common shares excludes stock awards representing 0.1 million shares in both the years ended December 31, 2019 and 2018 , and no shares of common stock in the year ended December 31, 2017

Curtailment of Manufacturing Fa

Curtailment of Manufacturing Facilities	12 Months Ended
	Dec. 31, 2019
Restructuring and Related Activities [Abstract]
Curtailment of Manufacturing Facilities	Curtailment of Manufacturing Facilities On November 2, 2018 , we decided to permanently curtail LVL production at our Roxboro, North Carolina facility by December 31, 2018 . After extended efforts to improve the throughput and cost position of LVL production at Roxboro, we concluded that we would be unable to reduce manufacturing costs to an acceptable level. Roxboro will continue to produce I-joists. As a result of the curtailment, we recorded $55.0 million of accelerated depreciation during fourth quarter 2018 to fully depreciate the curtailed LVL production assets. In addition, we recorded $2.6 million of construction in progress and spare parts write-offs, as well as $0.2 million of severance-related expenses, recorded in "Loss on sale and curtailment of facilities" in our Consolidated Statements of Operations. On February 20, 2020 , we made a decision to permanently curtail I-joist production at our Roxboro, North Carolina facility by March 31, 2020 . Across our industry, I-joist consumption per housing start has trended downward in recent years which we believe is due to decreases in the median home size and an increasing proportion of slab on grade new home construction. Because Roxboro is a higher cost facility and we have additional available I-joist capacity at our Alexandria, Louisiana facility, we plan to permanently curtail Roxboro I-joist production. We do not anticipate any impact on our customers. We expect to record approximately $18 million of charges during first quarter 2020, substantially all of which will be to fully depreciate the curtailed I-joist production assets.

Sale of Manufacturing Facilitie

Sale of Manufacturing Facilities	12 Months Ended
	Dec. 31, 2019
Discontinued Operations and Disposal Groups [Abstract]
Sale of Manufacturing Facilities	Sale of Manufacturing Facilities In December 2018, we committed to sell a hardwood plywood facility located in Moncure, North Carolina, and subsequently entered into a definitive sale agreement in January 2019 (the Moncure Sale). This facility generated net sales and operating loss of approximately $5.5 million and $1.4 million , respectively, during the year ended December 31, 2019 , net sales and operating loss of approximately $32.7 million and $7.0 million , respectively, during the year ended December 31, 2018 , and net sales and operating loss of approximately $28.2 million and $9.8 million , respectively, during the year ended December 31, 2017 . These results are included in the operating results of our Wood Products segment. On March 1, 2019, we closed on the Moncure Sale and received proceeds of $2.5 million . The disposal group met the criteria to be classified as held for sale in December 2018 and were recorded as assets held for sale in "Prepaid expenses and other" on our Consolidated Balance Sheet as of December 31, 2018. Upon classification as held for sale, we discontinued depreciation of the long-lived assets, and performed an assessment of impairment to identify and expense any excess of carrying value over fair value less costs to sell. As a result, we recorded pre-tax impairment and sale-related losses of $24.0 million during the year ended December 31, 2018, recorded in "Loss on sale and curtailment of facilities" in our Consolidated Statements of Operations. On September 10, 2018, we entered into an agreement to sell two lumber mills and a particleboard plant located in Northeast Oregon (the Sale). These facilities generated net sales and operating loss of approximately $74.1 million and $0.2 million , respectively, for the year ended December 31, 2018 , and net sales and operating income of approximately $82.5 million and $0.9 million , respectively, for the year ended December 31, 2017 . These results are included in the operating results of our Wood Products segment. On November 2, 2018, we closed on the Sale and received proceeds of $15.0 million . As a result, we recorded a pre-tax loss of $11.5 million during the year ended December 31, 2018 , recorded in "Loss on sale and curtailment of facilities" in our Consolidated Statements of Operations.

Acquisitions

Acquisitions	12 Months Ended
	Dec. 31, 2019
Business Combinations [Abstract]
Acquisitions	Acquisitions During the year ended December 31, 2019 , our wholly owned subsidiary, Boise Cascade Building Materials Distribution, L.L.C., completed the acquisition of a wholesale building material distribution location in Birmingham, Alabama (the Acquisition). The purchase price of the Acquisition was $15.7 million , including a post-closing adjustment of less than $0.1 million based upon a working capital target. We funded the Acquisition with cash on hand. The distribution location adds to our existing distribution business and strengthens our nationwide presence. In addition, we believe we will be able to broaden our product and service offerings within this market following the Acquisition. Goodwill represents the excess of the purchase price and related costs over the fair value of the net tangible and intangible assets of businesses acquired. The goodwill and customer relationships recognized from the Acquisition are deductible for U.S. income tax purposes. The useful life for customer relationships is 10 years. All of the goodwill and intangible assets were assigned to the Building Materials Distribution segment. The following table summarizes the final allocations of the purchase price to the assets acquired and liabilities assumed, based on our estimates of the fair value at the acquisition date: Acquisition Date Fair Value (thousands) Accounts receivable $ 5,563 Inventories 3,395 Other assets 8 Property and equipment 3,487 Lease right-of-use assets 359 Intangible assets: Customer relationships 2,100 Goodwill 1,223 Assets acquired 16,135 Accounts payable 100 Lease liabilities 359 Liabilities assumed 459 Net assets acquired $ 15,676 During the year ended December 31, 2018, our wholly owned subsidiary, Boise Cascade Building Materials Distribution, L.L.C., completed the acquisition of wholesale building material distribution locations in Nashville, Tennessee, Medford, Oregon, and Cincinnati, Ohio (collectively, the 2018 Acquisitions). The purchase price of the 2018 Acquisitions was $25.5 million .

Goodwill and Intangible Assets

Goodwill and Intangible Assets	12 Months Ended
	Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	Goodwill and Intangible Assets Goodwill represents the excess of the purchase price and related costs over the fair value of the net tangible and intangible assets of businesses acquired. The carrying amount of our goodwill by segment is as follows: Building Wood Products Total (thousands) Balance at December 31, 2018 $ 10,569 $ 48,590 $ 59,159 Additions 1,223 (a) — 1,223 Balance at December 31, 2019 $ 11,792 $ 48,590 $ 60,382 ______________________________________ (a) Represents the acquisition of a wholesale building material distribution location. For additional information, see Note 8, Acquisitions . At December 31, 2019 and 2018 , intangible assets represented the values assigned to trade names and trademarks and customer relationships. The trade names and trademarks have indefinite lives and are not amortized. The weighted-average useful life for customer relationships from the date of purchase is approximately 10 years. Amortization expense is expected to be approximately $1.2 million per year for the next five years. Intangible assets consisted of the following: December 31, 2019 Gross Carrying Amount Accumulated Amortization Net Carrying Amount (thousands) Trade names and trademarks $ 8,900 $ — $ 8,900 Customer relationships 12,450 (3,553 ) 8,897 $ 21,350 $ (3,553 ) $ 17,797 December 31, 2018 Gross Carrying Amount Accumulated Amortization Net Carrying Amount (thousands) Trade names and trademarks $ 8,900 $ — $ 8,900 Customer relationships 10,350 (2,399 ) 7,951 $ 19,250 $ (2,399 ) $ 16,851

Debt

Debt	12 Months Ended
	Dec. 31, 2019
Debt Disclosure [Abstract]
Debt	Debt Long-term debt consisted of the following: December 31, December 31, (thousands) Asset-based revolving credit facility $ — $ — Asset-based credit facility term loan due 2022 50,000 50,000 Term loan due 2026 45,000 45,000 5.625% senior notes due 2024 350,000 350,000 Deferred financing costs (4,456 ) (5,572 ) Long-term debt $ 440,544 $ 439,428 At December 31, 2019 , the maturities for the aggregate amount of long-term debt outstanding were as follows (in thousands): 2020 $ — 2021 — 2022 50,000 2023 — 2024 350,000 Thereafter 45,000 Asset-Based Credit Facility On May 15, 2015, Boise Cascade and its principal operating subsidiaries, Boise Cascade Wood Products, L.L.C., and Boise Cascade Building Materials Distribution, L.L.C., as borrowers, and Boise Cascade Wood Products Holdings Corp., as guarantor, entered into an Amended and Restated Credit Agreement, as amended, (Amended Agreement) with Wells Fargo Capital Finance, LLC, as administrative agent, and the banks named therein as lenders. The Amended Agreement includes a $370 million senior secured asset-based revolving credit facility (Revolving Credit Facility) and a $50.0 million term loan (ABL Term Loan) maturing on May 1, 2022. Interest on borrowings under our Revolving Credit Facility and ABL Term Loan are payable monthly. Borrowings under the Amended Agreement are constrained by a borrowing base formula dependent upon levels of eligible receivables and inventory reduced by outstanding borrowings and letters of credit (Availability). The Amended Agreement is secured by a first-priority security interest in substantially all of our assets, except for property and equipment. The proceeds of borrowings under the agreement are available for working capital and other general corporate purposes. The Amended Agreement contains customary nonfinancial covenants, including a negative pledge covenant and restrictions on new indebtedness, investments, distributions to equity holders, asset sales, and affiliate transactions, the scope of which are dependent on the Availability existing from time to time. The Amended Agreement also contains a requirement that we meet a 1 :1 fixed-charge coverage ratio (FCCR), applicable only if Availability falls below 10% of the aggregate revolving lending commitments (or $37 million ). Availability exceeded the minimum threshold amounts required for testing of the FCCR at all times since entering into the Amended Agreement, and Availability at December 31, 2019 , was $336.7 million . The Amended Agreement permits us to pay dividends only if at the time of payment (i) no default has occurred or is continuing (or would result from such payment) under the Amended Agreement, and (ii) pro forma Excess Availability (as defined in the Amended Agreement) is equal to or exceeds 25% of the aggregate Revolver Commitments (as defined in the Amended Agreement) or (iii) (x) pro forma Excess Availability is equal to or exceeds 15% of the aggregate Revolver Commitment and (y) our fixed-charge coverage ratio is greater than or equal to 1 :1 on a pro forma basis. Revolving Credit Facility Interest rates under the Revolving Credit Facility are based, at our election, on either LIBOR or a base rate, as defined in the Amended Agreement, plus a spread over the index elected that ranges from 1.25% to 1.75% for loans based on LIBOR and from 0.25% to 0.75% for loans based on the base rate. The spread is determined on the basis of a pricing grid that results in a higher spread as average quarterly Availability declines. Letters of credit are subject to a fronting fee payable to the issuing bank and a fee payable to the lenders equal to the LIBOR margin rate. In addition, we are required to pay an unused commitment fee at a rate of 0.25% per annum of the average unused portion of the lending commitments. At both December 31, 2019 and 2018 , we had no borrowings outstanding under the Revolving Credit Facility and $4.6 million of letters of credit outstanding. These letters of credit and borrowings, if any, reduce Availability under the Revolving Credit Facility by an equivalent amount. During the year ended December 31, 2019 , the maximum borrowings under the Revolving Credit Facility was $5.5 million and the average interest rate on borrowings was approximately 3.69% . ABL Term Loan The ABL Term Loan was provided by institutions within the Farm Credit system. Borrowings under the ABL Term Loan may be repaid from time to time at the discretion of the borrowers without premium or penalty. However, any principal amount of ABL Term Loan repaid may not be subsequently re-borrowed. Interest rates under the ABL Term Loan are based, at our election, on either LIBOR or a base rate, as defined in the Amended Agreement, plus a spread over the index elected that ranges from 1.75% to 2.25% for LIBOR rate loans and from 0.75% to 1.25% for base rate loans, both dependent on the amount of Average Excess Availability (as defined in the Amended Agreement). During the year ended December 31, 2019 , the average interest rate on the ABL Term Loan was approximately 4.01% . We have received and expect to continue receiving patronage credits under the ABL Term Loan. Patronage credits are distributions of profits from banks in the Farm Credit system, which are cooperatives that are required to distribute profits to their members. Patronage distributions, which are generally made in cash, are received in the year after they are earned. Patronage credits are recorded as a reduction to interest expense in the year earned. After giving effect to expected patronage distributions, the effective average net interest rate on the ABL Term Loan was approximately 3.0% during the year ended December 31, 2019 . Term Loan On March 30, 2016 (Closing Date), Boise Cascade and its principal operating subsidiaries, Boise Cascade Wood Products, L.L.C., and Boise Cascade Building Materials Distribution, L.L.C., as borrowers, and the guarantors party thereto, entered into a term loan agreement, as amended, (Term Loan Agreement) with American AgCredit, PCA, as administrative agent and sole lead arranger, and other banks in the Farm Credit system named therein as lenders. The Term Loan Agreement was for a $75.0 million secured term loan (Term Loan). The outstanding principal balance of the Term Loan amortizes and is payable in equal installments of $10 million per year on each of the sixth, seventh, eighth, and ninth anniversaries of the Closing Date, with the remaining principal balance due and payable on March 30, 2026. Interest on our Term Loan is payable monthly. In December 2016, we prepaid $30 million of the Term Loan, which became available to reborrow. In November 2018, we terminated the ability to reborrow this prepaid Term Loan. This prepayment of $30 million satisfied our principal obligations due on the sixth, seventh, and eighth anniversaries of the Closing Date. Pursuant to the Term Loan Agreement, the borrowers are required to maintain, as of the end of any fiscal quarter, a Capitalization Ratio lower than 60% , a Consolidated Net Worth greater than $350 million , and Available Liquidity greater than $100 million (each as defined in the Term Loan Agreement). In addition, under the Term Loan Agreement, and subject to certain exceptions, the borrowers may not, among other things, (i) incur indebtedness, (ii) incur liens, (iii) make junior payments, (iv) make certain investments, and (v) under certain circumstances, make capital expenditures in excess of $50 million during four consecutive quarters. The Term Loan Agreement also includes customary representations of the borrowers and provides for certain events of default customary for similar facilities. The Term Loan Agreement permits us to pay dividends only if at the time of payment (i) no default has occurred or is continuing (or would result from such payment) under the Term Loan Agreement, and (ii) our interest coverage ratio is greater than or equal to 3 :1 at such time or (iii) our fixed-charge coverage ratio is greater than or equal to 1 :1. Interest rates under the Term Loan Agreement are based, at our election, on either the LIBOR or a base rate, as defined in the Term Loan Agreement, plus a spread over the index. The applicable spread for the Term Loan ranges from 1.875% to 2.125% for LIBOR rate loans, and 0.875% to 1.125% for base rate loans, both dependent on our Interest Coverage Ratio (as defined in the Term Loan Agreement). During the year ended December 31, 2019 , the average interest rate on the Term Loan was approximately 4.14% . We have received and expect to continue receiving patronage credits under the Term Loan. After giving effect to expected patronage distributions, the effective average net interest rate on the Term Loan was approximately 3.1% . The Term Loan is secured by a first priority mortgage on our Thorsby, Alabama, and Roxboro, North Carolina, EWP facilities and a first priority security interest on the equipment and certain tangible personal property located therein. 2024 Notes On August 29, 2016, Boise Cascade issued $350 million of 5.625% senior notes due September 1, 2024 (2024 Notes), through a private placement that was exempt from the registration requirements of the Securities Act. Interest on our 2024 Notes is payable semiannually in arrears on March 1 and September 1. The 2024 Notes are guaranteed by each of our existing and future direct or indirect domestic subsidiaries that is a guarantor under our Amended Agreement. The 2024 Notes are senior unsecured obligations and rank equally with all of the existing and future senior indebtedness of Boise Cascade Company and of the guarantors, senior to all of their existing and future subordinated indebtedness, effectively subordinated to all of their present and future senior secured indebtedness (including all borrowings with respect to our Amended Agreement to the extent of the value of the assets securing such indebtedness), and structurally subordinated to the indebtedness of any subsidiaries that do not guarantee the 2024 Notes. The terms of the indenture governing the 2024 Notes, among other things, limit the ability of Boise Cascade and our restricted subsidiaries to: incur additional debt; declare or pay dividends; redeem stock or make other distributions to stockholders; make investments; create liens on assets; consolidate, merge or transfer substantially all of their assets; enter into transactions with affiliates; and sell or transfer certain assets. The indenture governing the 2024 Notes permits us to pay dividends only if at the time of payment (i) no default has occurred or is continuing (or would result from such payment) under the indenture, and (ii) our consolidated leverage ratio is no greater than 3.5 :1, or (iii) the dividend, together with other dividends since the issue date, would not exceed our "builder" basket under the indenture. In addition, the indenture includes certain specific baskets for the payment of dividends. The indenture governing the 2024 Notes provides for customary events of default and remedies. Interest Rate Swaps For information on interest rate swaps, see Interest Rate Risk and Interest Rate Swaps of Note 16, Financial Instrument Risk . Cash Paid for Interest For the years ended December 31, 2019 , 2018 , and 2017 , cash payments for interest were $24.1 million , $24.1 million , and $23.5 million , respectively.

Leases

Leases	12 Months Ended
	Dec. 31, 2019
Leases [Abstract]
Lessee, Operaring Leases	Leases Adoption of ASC Topic 842, "Leases" On January 1, 2019, we adopted Topic 842 using the modified retrospective transition method and used the effective date as our date of initial application. Consequently, leases for reporting periods beginning after January 1, 2019 are presented under Topic 842, while prior period amounts are not adjusted and continue to be reported in accordance with our historic accounting under Topic 840. The new standard provides a number of optional practical expedients in transition. We elected the ‘package of practical expedients’, which permits us not to reassess under the new standard our prior conclusions about lease identification, lease classification, and initial direct costs. We did not elect the use-of-hindsight practical expedient. We recorded additional lease liabilities for operating leases of $72.4 million , with an offsetting increase to ROU assets of approximately $69.2 million as of January 1, 2019, substantially all of which are real estate leases. The difference between these amounts is related to the reclassification of accrued straight-line rent upon adoption. Capital leases were also reclassified from "Property and equipment, net" to "Finance lease right-of-use assets" and from "Other long-term liabilities" to "Finance lease liabilities" on our Consolidated Balance Sheet. The standard did not have a material impact on our consolidated net earnings and cash flows. There was no cumulative effect adjustment recorded to opening retained earnings as of January 1, 2019, upon adoption of Topic 842. The effect of the changes made to our consolidated balance sheet as of January 1, 2019, for the adoption of the new lease standard was as follows: Balance at December 31, 2018 Adjustments Due to ASC 842 Balance at January 1, 2019 (thousands) ASSETS Property and equipment, net $ 487,224 $ (21,732 ) $ 465,492 Operating lease right-of-use assets — 69,155 69,155 Finance lease right-of-use assets — 20,872 20,872 Prepaid expenses and other 31,818 (246 ) 31,572 LIABILITIES Accrued liabilities, other 63,509 8,863 72,372 Operating lease liabilities, net of current portion — 63,498 63,498 Finance lease liabilities, net of current portion — 21,921 21,921 Other long-term liabilities 38,904 (26,233 ) 12,671 In accordance with the new lease standard requirements, the disclosure of the impact of adoption on our consolidated balance sheet was as follows: December 31, 2019 As Reported Balances Without Adoption of ASC 842 Effect of Change Higher/(Lower) (thousands) ASSETS Property and equipment, net $ 476,949 $ 499,532 $ (22,583 ) Operating lease right-of-use assets 64,228 — 64,228 Finance lease right-of-use assets 21,798 — 21,798 Prepaid expenses and other 8,285 8,591 (306 ) LIABILITIES Accrued liabilities, other 69,772 60,393 9,379 Operating lease liabilities, net of current portion 58,029 — 58,029 Finance lease liabilities, net of current portion 23,419 — 23,419 Other long-term liabilities 12,757 40,447 (27,690 ) Leases We primarily lease land, building, and equipment under operating and finance leases. We determine if an arrangement is a lease at inception and assess lease classification as either operating or finance at lease inception or upon modification. Substantially all of our leases with initial terms greater than one year are for real estate, including distribution centers, corporate headquarters, land, and other office space. Substantially all of these lease agreements have fixed payment terms based on the passage of time and are recorded in our Building Materials Distribution segment. Many of our leases include fixed escalation clauses, renewal options and/or termination options that are factored into our determination of lease term and lease payments when appropriate. Renewal options generally range from one to ten years with fixed payment terms similar to those in the original lease agreements. Some lease agreements provide us with the option to purchase the leased property at market value. Our lease agreements do not contain any residual value guarantees. ROU assets represent our right to use an underlying asset for the lease term and lease liabilities represent our obligation to make lease payments arising from the lease. ROU assets and lease liabilities are recognized at the lease commencement date based on the estimated present value of fixed lease payments over the lease term. The current portion of our operating and finance lease liabilities are recorded in "Accrued liabilities, Other" on our Consolidated Balance Sheets. We use our estimated incremental borrowing rate, which is derived from information available at the lease commencement date, in determining the present value of lease payments. In determining our incremental borrowing rates, we give consideration to publicly available interest rates for instruments with similar characteristics. For purposes of determining straight-line rent expense, the lease term is calculated from the date we first take possession of the facility, including any periods of free rent and any renewal option periods we are reasonably certain of exercising. Variable lease expense generally includes reimbursement of actual costs for common area maintenance, property taxes, and insurance on leased real estate and are recorded as incurred. Most of our operating lease expense was recorded in "Selling and distribution expenses" in our Consolidated Statements of Operations. The new standard provides practical expedients for an entity’s ongoing accounting. We elected the practical expedient to not separate lease and non-lease components for all of our leases. We also elected the short-term lease recognition exemption for all leases that qualify. This means, for those leases that qualify, we will not recognize ROU assets or lease liabilities, and this includes not recognizing ROU assets or lease liabilities for existing short-term leases in transition. Our short-term leases primarily include equipment rentals with lease terms on a month-to-month basis, which provide for our seasonal needs and flexibility in the use of equipment. Our short-term leases also include certain real estate for which either party has the right to cancel upon providing notice of 30 to 90 days. Lease Costs The components of lease expense were as follows: Year Ended December 31, 2019 (thousands) Operating lease cost $ 13,541 Finance lease cost Amortization of right-of-use assets 1,616 Interest on lease liabilities 1,899 Variable lease cost 2,645 Short-term lease cost 4,614 Sublease income (540 ) Total lease cost $ 23,775 Other Information Supplemental cash flow information related to leases was as follows: Year Ended December 31, 2019 (thousands) Cash paid for amounts included in the measurement of lease liabilities Operating cash flows from operating leases $ 13,508 Operating cash flows from finance leases 1,862 Financing cash flows from finance leases 783 Right-of-use assets obtained in exchange for lease obligations Operating leases 4,211 Finance leases 2,637 Other information related to leases was as follows: December 31, 2019 Weighted-average remaining lease term (years) Operating leases 8 Finance leases 14 Weighted-average discount rate Operating leases (a) 6.5 % Finance leases 8.5 % ___________________________________ (a) Upon adoption of the new lease standard, discount rates used for existing leases were established at January 1, 2019. As of December 31, 2019 , our minimum lease payment requirements for noncancelable operating and finance leases are as follows: Operating Leases Finance Leases (thousands) 2020 $ 13,344 $ 3,009 2021 12,211 3,048 2022 10,847 3,043 2023 10,521 3,071 2024 9,920 3,076 Thereafter 32,592 28,889 Total future minimum lease payments 89,435 44,136 Less: interest (22,027 ) (19,634 ) Total lease obligations 67,408 24,502 Less: current obligations (9,379 ) (1,083 ) Long-term lease obligations $ 58,029 $ 23,419 As of December 31, 2019 , the minimum lease payment amount for operating leases signed but not yet commenced was $3.9 million . Disclosures Related to Periods Prior to Adoption of ASC Topic 842, "Leases" Rental expense for operating leases was $18.2 million and $19.3 million for the years ended December 31, 2018 and 2017 , respectively. Sublease rental income was not material in any of the periods presented. During the year ended December 31, 2018 , we recorded two capital leases for distribution centers with initial lease terms of 13 and 20 years , respectively, in the amount of $18.9 million , which represents non-cash investing and financing activities. At December 31, 2018 , we had $23.7 million of gross capital lease assets recorded in "Property and equipment, net" on our Consolidated Balance Sheet. At December 31, 2018, capital lease obligations were recorded in "Other long-term liabilities" on our Consolidated Balance Sheets. As of December 31, 2018, our minimum lease payment requirements for noncancelable operating and capital leases with terms of more than one year are as follows: Operating Leases Capital Leases (thousands) 2019 $ 13,222 $ 2,578 2020 12,734 2,617 2021 11,595 2,656 2022 10,208 2,694 2023 9,800 2,740 Thereafter 40,381 30,177 Total $ 97,940 43,462 Less: interest on capital lease obligations (20,838 ) Total principal payable on capital lease obligations 22,624 Less: current obligations (703 ) Long-term capital lease obligations $ 21,921 These future minimum lease payment requirements have not been reduced by sublease income due in the future under noncancelable subleases. Minimum sublease income expected to be received in the future is not material.
Lessee, Finance Leases	Leases Adoption of ASC Topic 842, "Leases" On January 1, 2019, we adopted Topic 842 using the modified retrospective transition method and used the effective date as our date of initial application. Consequently, leases for reporting periods beginning after January 1, 2019 are presented under Topic 842, while prior period amounts are not adjusted and continue to be reported in accordance with our historic accounting under Topic 840. The new standard provides a number of optional practical expedients in transition. We elected the ‘package of practical expedients’, which permits us not to reassess under the new standard our prior conclusions about lease identification, lease classification, and initial direct costs. We did not elect the use-of-hindsight practical expedient. We recorded additional lease liabilities for operating leases of $72.4 million , with an offsetting increase to ROU assets of approximately $69.2 million as of January 1, 2019, substantially all of which are real estate leases. The difference between these amounts is related to the reclassification of accrued straight-line rent upon adoption. Capital leases were also reclassified from "Property and equipment, net" to "Finance lease right-of-use assets" and from "Other long-term liabilities" to "Finance lease liabilities" on our Consolidated Balance Sheet. The standard did not have a material impact on our consolidated net earnings and cash flows. There was no cumulative effect adjustment recorded to opening retained earnings as of January 1, 2019, upon adoption of Topic 842. The effect of the changes made to our consolidated balance sheet as of January 1, 2019, for the adoption of the new lease standard was as follows: Balance at December 31, 2018 Adjustments Due to ASC 842 Balance at January 1, 2019 (thousands) ASSETS Property and equipment, net $ 487,224 $ (21,732 ) $ 465,492 Operating lease right-of-use assets — 69,155 69,155 Finance lease right-of-use assets — 20,872 20,872 Prepaid expenses and other 31,818 (246 ) 31,572 LIABILITIES Accrued liabilities, other 63,509 8,863 72,372 Operating lease liabilities, net of current portion — 63,498 63,498 Finance lease liabilities, net of current portion — 21,921 21,921 Other long-term liabilities 38,904 (26,233 ) 12,671 In accordance with the new lease standard requirements, the disclosure of the impact of adoption on our consolidated balance sheet was as follows: December 31, 2019 As Reported Balances Without Adoption of ASC 842 Effect of Change Higher/(Lower) (thousands) ASSETS Property and equipment, net $ 476,949 $ 499,532 $ (22,583 ) Operating lease right-of-use assets 64,228 — 64,228 Finance lease right-of-use assets 21,798 — 21,798 Prepaid expenses and other 8,285 8,591 (306 ) LIABILITIES Accrued liabilities, other 69,772 60,393 9,379 Operating lease liabilities, net of current portion 58,029 — 58,029 Finance lease liabilities, net of current portion 23,419 — 23,419 Other long-term liabilities 12,757 40,447 (27,690 ) Leases We primarily lease land, building, and equipment under operating and finance leases. We determine if an arrangement is a lease at inception and assess lease classification as either operating or finance at lease inception or upon modification. Substantially all of our leases with initial terms greater than one year are for real estate, including distribution centers, corporate headquarters, land, and other office space. Substantially all of these lease agreements have fixed payment terms based on the passage of time and are recorded in our Building Materials Distribution segment. Many of our leases include fixed escalation clauses, renewal options and/or termination options that are factored into our determination of lease term and lease payments when appropriate. Renewal options generally range from one to ten years with fixed payment terms similar to those in the original lease agreements. Some lease agreements provide us with the option to purchase the leased property at market value. Our lease agreements do not contain any residual value guarantees. ROU assets represent our right to use an underlying asset for the lease term and lease liabilities represent our obligation to make lease payments arising from the lease. ROU assets and lease liabilities are recognized at the lease commencement date based on the estimated present value of fixed lease payments over the lease term. The current portion of our operating and finance lease liabilities are recorded in "Accrued liabilities, Other" on our Consolidated Balance Sheets. We use our estimated incremental borrowing rate, which is derived from information available at the lease commencement date, in determining the present value of lease payments. In determining our incremental borrowing rates, we give consideration to publicly available interest rates for instruments with similar characteristics. For purposes of determining straight-line rent expense, the lease term is calculated from the date we first take possession of the facility, including any periods of free rent and any renewal option periods we are reasonably certain of exercising. Variable lease expense generally includes reimbursement of actual costs for common area maintenance, property taxes, and insurance on leased real estate and are recorded as incurred. Most of our operating lease expense was recorded in "Selling and distribution expenses" in our Consolidated Statements of Operations. The new standard provides practical expedients for an entity’s ongoing accounting. We elected the practical expedient to not separate lease and non-lease components for all of our leases. We also elected the short-term lease recognition exemption for all leases that qualify. This means, for those leases that qualify, we will not recognize ROU assets or lease liabilities, and this includes not recognizing ROU assets or lease liabilities for existing short-term leases in transition. Our short-term leases primarily include equipment rentals with lease terms on a month-to-month basis, which provide for our seasonal needs and flexibility in the use of equipment. Our short-term leases also include certain real estate for which either party has the right to cancel upon providing notice of 30 to 90 days. Lease Costs The components of lease expense were as follows: Year Ended December 31, 2019 (thousands) Operating lease cost $ 13,541 Finance lease cost Amortization of right-of-use assets 1,616 Interest on lease liabilities 1,899 Variable lease cost 2,645 Short-term lease cost 4,614 Sublease income (540 ) Total lease cost $ 23,775 Other Information Supplemental cash flow information related to leases was as follows: Year Ended December 31, 2019 (thousands) Cash paid for amounts included in the measurement of lease liabilities Operating cash flows from operating leases $ 13,508 Operating cash flows from finance leases 1,862 Financing cash flows from finance leases 783 Right-of-use assets obtained in exchange for lease obligations Operating leases 4,211 Finance leases 2,637 Other information related to leases was as follows: December 31, 2019 Weighted-average remaining lease term (years) Operating leases 8 Finance leases 14 Weighted-average discount rate Operating leases (a) 6.5 % Finance leases 8.5 % ___________________________________ (a) Upon adoption of the new lease standard, discount rates used for existing leases were established at January 1, 2019. As of December 31, 2019 , our minimum lease payment requirements for noncancelable operating and finance leases are as follows: Operating Leases Finance Leases (thousands) 2020 $ 13,344 $ 3,009 2021 12,211 3,048 2022 10,847 3,043 2023 10,521 3,071 2024 9,920 3,076 Thereafter 32,592 28,889 Total future minimum lease payments 89,435 44,136 Less: interest (22,027 ) (19,634 ) Total lease obligations 67,408 24,502 Less: current obligations (9,379 ) (1,083 ) Long-term lease obligations $ 58,029 $ 23,419 As of December 31, 2019 , the minimum lease payment amount for operating leases signed but not yet commenced was $3.9 million . Disclosures Related to Periods Prior to Adoption of ASC Topic 842, "Leases" Rental expense for operating leases was $18.2 million and $19.3 million for the years ended December 31, 2018 and 2017 , respectively. Sublease rental income was not material in any of the periods presented. During the year ended December 31, 2018 , we recorded two capital leases for distribution centers with initial lease terms of 13 and 20 years , respectively, in the amount of $18.9 million , which represents non-cash investing and financing activities. At December 31, 2018 , we had $23.7 million of gross capital lease assets recorded in "Property and equipment, net" on our Consolidated Balance Sheet. At December 31, 2018, capital lease obligations were recorded in "Other long-term liabilities" on our Consolidated Balance Sheets. As of December 31, 2018, our minimum lease payment requirements for noncancelable operating and capital leases with terms of more than one year are as follows: Operating Leases Capital Leases (thousands) 2019 $ 13,222 $ 2,578 2020 12,734 2,617 2021 11,595 2,656 2022 10,208 2,694 2023 9,800 2,740 Thereafter 40,381 30,177 Total $ 97,940 43,462 Less: interest on capital lease obligations (20,838 ) Total principal payable on capital lease obligations 22,624 Less: current obligations (703 ) Long-term capital lease obligations $ 21,921 These future minimum lease payment requirements have not been reduced by sublease income due in the future under noncancelable subleases. Minimum sublease income expected to be received in the future is not material.

Retirement and Benefit Plans

Retirement and Benefit Plans	12 Months Ended
	Dec. 31, 2019
Retirement Benefits [Abstract]
Retirement and Benefit Plans	Retirement and Benefit Plans Our retirement plans consist of noncontributory defined benefit pension plans, contributory defined contribution savings plans, a deferred compensation plan, and a multiemployer health and welfare plan. Defined Benefit Plans Some of our employees are covered by noncontributory defined benefit pension plans. We have one qualified defined benefit pension plan (Pension Plan). Benefits under the Pension Plan are frozen for salaried employees and substantially all eligible hourly employees. The following summarizes recent activity of each individual plan: • On September 30, 2019, we transferred $19.8 million of our Pension Plan assets to The Prudential Insurance Company of America (Prudential) for the purchase of a group annuity contract. Under the arrangement, Prudential assumed ongoing responsibility for administration and benefit payments for approximately 10% of our U.S. qualified pension plan projected benefit obligations at the time of the transaction. As a result of the transaction, we recognized a non-cash settlement charge of $1.3 million in third quarter 2019. • On April 25, 2018, and August 10, 2018, we transferred $151.8 million and $124.8 million , respectively, of our Pension Plan assets to Prudential for the purchase of group annuity contracts. Under the arrangements, Prudential assumed ongoing responsibility for administration and benefit payments for over 60% of our U.S. qualified pension plan projected benefit obligations. As a result of the transfers of pension plan assets, we recorded settlement expense in second and third quarters 2018 of $12.0 million and $11.3 million , respectively. See "Assumptions" below for the impact on our discount rate and expected return on plan asset assumptions. We also have nonqualified salaried pension plans, which were frozen so that no future benefits have accrued since December 31, 2009. Defined Contribution Plans We sponsor contributory defined contribution savings plans for most of our salaried and hourly employees, and we generally provide company contributions to the savings plans. Since March 1, 2010, we have contributed 4% of each salaried participant's eligible compensation to the plan as a nondiscretionary company contribution. In addition, beginning in 2012, for the years that a performance target is met, we contribute an additional amount of the employee's eligible compensation, depending on company performance and the employee's years of service. During the years ended December 31, 2019 , 2018 , and 2017 , company performance resulted in additional contributions in the range of 1.6% to 3.1% , 2% to 4% , and 1% to 2% , respectively, of eligible compensation. The company contributions for union and nonunion hourly employees vary by location. Company contributions paid, or to be paid, to our defined contribution savings plans for the years ended December 31, 2019 , 2018 , and 2017 , were $19.8 million , $22.2 million , and $15.9 million , respectively. Defined Contributory Trust We have participated in a multiemployer defined contributory trust plan for certain union hourly employees since 2013. As of December 31, 2019 , 2018 , and 2017 approximately 1,215 , 1,221 , and 1,365 , respectively, of our employees participated in this plan. For certain of these employees, per the terms of the representative collective bargaining agreements, we were required to contribute $0.90 , $0.85 , and $0.80 , respectively, per hour per active employee during 2019 , 2018 , and 2017 . For certain other of these employees, we were required to contribute 4.5% of the employee's earnings during 2019 , 2018 , and 2017 . Company contributions to the multiemployer defined contributory trust plan for the year ended December 31, 2019 was $2.6 million and $2.8 million for each of the years ended December 31, 2018 and 2017 . After required contributions, we have no further obligation to the plan. The plan and its assets are managed by a joint board of trustees. Deferred Compensation Plan We sponsor a deferred compensation plan. Under the plan, participating employees irrevocably elect each year to defer receipt of a portion of their base salary and incentive compensation. A participant's account is credited with imputed interest at a rate equal to 130% of Moody's Composite Average of Yields on Corporate Bonds. Participants may receive payment of their deferred compensation plan balance in a lump sum or in monthly installments over a specified period of years following the termination of their employment with the company. In addition, subject to plan revisions that became effective January 1, 2019, participants may also receive distributions of their deferred compensation accounts while still employed by the company. The deferred compensation plan is unfunded; therefore, benefits are paid from our general assets. For the years ended December 31, 2019 , 2018 , and 2017 , we recognized $1.1 million , $1.0 million , and $0.8 million , respectively, of interest expense related to the plan. At December 31, 2019 and 2018 , we had liabilities related to the plan of $2.1 million and $1.1 million , respectively, recorded in "Accrued liabilities, Compensation and benefits" and $21.6 million and $18.8 million , respectively, recorded in "Other, Compensation and benefits" on our Consolidated Balance Sheets. Multiemployer Health and Welfare Plan We participate in a multiemployer health and welfare plan that covers medical, dental, and life insurance benefits for certain active employees as well as benefits for retired employees. As of December 31, 2019 , 2018 , and 2017 , approximately 475 , 604 , and 649 , respectively, of our employees participated in this plan. Per the terms of the representative collective bargaining agreements, we were required to contribute $5.80 per hour per active employee from January 1, 2017, to May 31, 2017. From June 1, 2017, to May 31, 2018, we were required to contribute $6.10 per hour per active employee. From June 1, 2018, to May 31, 2019, we were required to contribute $6.40 per hour per active employee. Since June 1, 2019, we are required to contribute $6.70 per hour per active employee. During the years ended December 31, 2019 , 2018 , and 2017 company contributions to the multiemployer health and welfare plan were $6.7 million , $7.7 million , and $8.1 million , respectively. After required contributions, we have no further obligation to the plan. The trustees of the plan determine the allocation of benefits between active and retired employees. Defined Benefit Obligations and Funded Status The following table, which includes only company-sponsored defined benefit plans, reconciles the beginning and ending balances of our projected benefit obligation and fair value of plan assets. We recognize the underfunded status of our defined benefit pension plans on our Consolidated Balance Sheets. We recognize changes in funded status in the year changes occur through other comprehensive income (loss). December 31 2019 2018 (thousands) Change in benefit obligation Benefit obligation at beginning of year $ 176,852 $ 483,525 Service cost 647 794 Interest cost 7,210 11,344 Actuarial (gain) loss 29,065 (39,651 ) Group annuity transactions (a) (19,848 ) (265,137 ) Benefits paid (1,865 ) (14,023 ) Benefit obligation at end of year 192,061 176,852 Change in plan assets Fair value of plan assets at beginning of year 154,801 422,255 Actual return on plan assets 29,769 (3,968 ) Employer contributions 5,238 26,081 Group annuity transactions (a) (19,292 ) (275,544 ) Benefits paid (1,865 ) (14,023 ) Fair value of plan assets at end of year 168,651 154,801 Underfunded status $ (23,410 ) $ (22,051 ) Amounts recognized on our Consolidated Balance Sheets Current liabilities $ (878 ) $ (671 ) Noncurrent liabilities (22,532 ) (21,380 ) Net liability $ (23,410 ) $ (22,051 ) Amounts recognized in accumulated other comprehensive loss Net actuarial loss $ 15,332 $ 11,856 Prior service cost — — Net loss recognized $ 15,332 $ 11,856 ______________________________________ (a) See Defined Benefits Plans above for description of group annuity transactions. The accumulated benefit obligation for all defined benefit pension plans was $192.1 million and $176.9 million at December 31, 2019 and 2018 , respectively. All of our defined benefit pension plans have accumulated benefit obligations that exceed the fair value of plan assets. Net Periodic Benefit Cost and Other Comprehensive (Income) Loss The components of net periodic benefit cost and other amounts recognized in other comprehensive (income) loss are as follows: Year Ended December 31 2019 2018 2017 (thousands) Net periodic benefit cost Service cost $ 647 $ 794 $ 1,204 Interest cost 7,210 11,344 17,542 Expected return on plan assets (5,903 ) (11,097 ) (18,968 ) Amortization of actuarial (gain) loss (175 ) 1,497 1,686 Plan settlement expense (a) 1,342 23,255 — Net periodic benefit cost 3,121 25,793 1,464 Changes in plan assets and benefit obligations recognized in other comprehensive (income) loss Net actuarial (gain) loss 4,642 (14,178 ) (7,067 ) Amortization of actuarial gain (loss) 175 (1,497 ) (1,686 ) Effect of settlements (1,342 ) (23,255 ) — Total recognized in other comprehensive (income) loss 3,475 (38,930 ) (8,753 ) Total recognized in net periodic cost and other comprehensive (income) loss $ 6,596 $ (13,137 ) $ (7,289 ) ______________________________________ (a) Plan settlement expense during the years ended December 31, 2019 and 2018 includes $1.3 million and $23.3 million , respectively, of settlement charges related to the transfers of pension plan assets to Prudential for the purchase of group annuity contracts. In 2020 , we estimate net periodic pension expense will be approximately $2 million , including $0.8 million of net actuarial loss that will be amortized from accumulated other comprehensive loss. Assumptions The assumptions used in accounting for our plans are estimates of factors that will determine, among other things, the amount and timing of future contributions. The following table presents the assumptions used in the measurement of our benefit obligations: December 31 2019 2018 Weighted average assumptions Discount rate 3.10 % 4.15 % Rate of compensation increases (b) — % — % The following table presents the assumptions used in the measurement of net periodic benefit cost: December 31 2019 2018 (a) 2017 Weighted average assumptions Discount rate 4.15 % 3.95 % / 4.05 % / 3.40 % 3.90 % Expected long-term rate of return on plan assets 3.85 % 3.85 % / 4.50 % / 4.75 % 5.00 % Rate of compensation increases (b) — % — % — % _______________________________________ (a) Prior to the remeasurements of our qualified defined benefit pension plan on April 25, 2018, and August 10, 2018, the discount rates were 3.40% and 4.05% , respectively, and the expected rates of return on plan assets were 4.75% and 4.50% , respectively. The discount rate and expected rate of return on plan assets after the August 10, 2018 remeasurement were 3.95% and 3.85% , respectively. (b) Pension benefits for all salaried employees are frozen, resulting in an assumption for the rate of compensation increase of zero . In addition to the salaried benefits being frozen, there are currently no scheduled increases in pension benefit rates applicable to past service covering the minimal number of hourly employees who continue to accrue benefits. Discount Rate Assumption . The discount rate reflects the current rate at which the pension obligations could be settled at each measurement date of the plan. In all years presented, the discount rates were determined by matching the expected plan benefit payments against a spot rate yield curve constructed to replicate the yields of Aa-graded corporate bonds. Asset Return Assumption . We base our expected long-term rate of return on plan assets on a weighted average of our expected returns for the major asset classes in which we invest. The weights we assign each asset class are based on our investment strategy. Expected returns for the asset classes are based on long-term historical returns, inflation expectations, forecasted gross domestic product, earnings growth, and other economic factors. We developed our return assumption based on a review of the fund manager's estimates of future market expectations by broad asset class and expected long-term rates of return from external investment managers. The weighted average expected return on plan assets we will use in our calculation of 2020 net periodic benefit cost is 3.50% . Retirement and Mortality Rates . These rates are developed to reflect actual and projected plan experience. In 2019 , we used the Pri-2012 mortality tables projected forward using MP-2019 on a generational basis. In 2018 , we used the RP-2014 mortality tables adjusted to reflect mortality improvement scale MP-2015 and projected forward using MP-2018 on a generational basis. Investment Policies and Strategies Our Retirement Funds Investment Committee (RFIC) is responsible for establishing and overseeing the implementation of our investment policy. Russell Investments (Russell) oversees the active management of our pension investments through its manager of managers program in order to achieve broad diversification in a cost-effective manner. At December 31, 2019 , as dictated by investment allocation guidelines established by our RFIC, approximately 90% of our pension plan assets were invested in fixed-income securities, and approximately 10% were invested in a multi-asset class fund, both of which are described in more detail below. Our investment objective is to hedge the plan’s future exposure to interest rate risk by investing the substantial majority of plan assets in fixed income securities that have a duration profile closely aligned with the duration profile of the remaining plan liability. This is consistent with a de-risking strategy established by our RFIC. Investment securities, in general, are exposed to various risks, such as interest rate, credit, and overall market volatility risk, all of which are subject to change. In addition, our overall investment strategy and related allocations between equity and fixed-income securities may change from time to time based on market conditions, external economic factors, and the funded status of our plans. Due to the level of risk associated with certain investment securities, it is reasonably possible that changes in the values of investment securities will occur in the near term, and such changes could materially affect the reported amounts. Fair Value Measurements of Plan Assets The following table sets forth by level, within the fair value hierarchy, the pension plan assets, by major asset category, at fair value at December 31, 2019 and 2018 : December 31, 2019 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) (a) Significant Unobservable Inputs (Level 3) Total (thousands) Fixed-income securities (b) $ — $ 152,530 $ — $ 152,530 Multi-asset class fund (c) — 16,361 — 16,361 Total investments at fair value $ — $ 168,891 $ — 168,891 Receivables and accrued expenses, net (240 ) Fair value of plan assets $ 168,651 December 31, 2018 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) (a) Significant Unobservable Inputs (Level 3) Total (thousands) Fixed-income securities (b) $ — $ 141,930 $ — $ 141,930 Multi-asset class fund (c) — 12,431 — 12,431 Total investments at fair value $ — $ 154,361 $ — 154,361 Receivables and accrued expenses, net 440 Fair value of plan assets $ 154,801 _______________________________________ (a) Securities represent common collective trusts managed and valued by Russell Trust Company, the administrator of the funds. While the underlying assets are actively traded on an exchange, the funds are not. The investments in equity and fixed-income securities are considered to have a readily determinable fair value because the fair value per share (unit) is determined and published and is the basis for current transactions. We have the ability to redeem these securities with a 1 day notice. (b) Invested in the Russell Long Duration Fixed Income Fund at December 31, 2019 and 2018, which is designed to provide current income and capital appreciation through diversified strategies including sector rotation, modest interest rate timing, security selection, and tactical use of high-yield, emerging market bonds and other non-index securities. In addition, at December 31, 2019 and 2018, our investments in this category included the Russell 14 Year LDI Fixed Income Fund. We also were invested in the Russell 8 Year LDI Fixed Income Fund at December 31, 2019. These LDI funds invest primarily in investment grade bonds that closely match those found in discount rate curves used to value U.S. pension liabilities and seeks to provide additional incremental return through modest interest rate timing, security selection, and tactical use of non-credit sectors. In addition, at December 31, 2019 and 2018, our investments in this category included Russell STRIPS Fixed Income Funds with duration profiles of 10 , 15 , and 28 years. These funds invest in a subset of the STRIPS universe with a similar duration profile as their respective Bloomberg Barclays U.S. STRIPS Index. (c) Invested in the Russell Multi-Asset Core Plus Fund, which is designed to provide long-term growth by providing a diversified portfolio of investments that has an overall strategic allocation of 75% global equity, 15% marketable real assets, and 10% global fixed income. Cash Flows Since 2012, we have contributed a total of four company-owned real property locations from our Building Materials Distribution segment to our qualified defined benefit pension plan. These contributions constituted related party transactions. We have since repurchased two of these properties as discussed below. We are leasing back the remaining two contributed properties for initial terms of ten years ending in 2022 and 2023, respectively, with two five year extension options and continue to use the properties in our distribution operations. Rent payments are made quarterly and include 2% annual escalation rates. Each lease provides us a right of first refusal on any subsequent sale by the pension plan, as well as repurchase options at the end of the initial term and extension periods. The plan engaged an independent fiduciary who negotiated the lease terms and also manages the properties on behalf of the plan. We determined that the contribution of the properties does not meet the accounting definition of a plan asset within the scope of Accounting Standards Codification 715, Compensation — Retirement Benefits . Accordingly, the contributed properties are not considered a contribution for accounting purposes and, as a result, are not included in plan assets and have no impact on the net pension liability recorded on our Consolidated Balance Sheets. We continue to depreciate the carrying value of the properties in our financial statements, and no gain or loss was recognized at the contribution date for accounting purposes. Lease payments are recorded as pension contributions. During each of the fourth quarters 2019 and 2018, we repurchased one of the real property locations we previously had contributed to our qualified defined benefit pension plan for approximately $3.6 million (the 2019 Repurchase) and $4.0 million (the 2018 Repurchase), respectively, which were recorded as pension contributions. Our practice is to fund the pension plans in amounts sufficient to meet the minimum requirements of U.S. federal laws and regulations. Additional discretionary funding may be provided as deemed appropriate. For the years ended December 31, 2019 , 2018 , and 2017 , we made cash contributions to our pension plans totaling $5.2 million , $26.1 million , and $2.2 million , respectively. During 2019, cash contributions include $3.6 million for the 2019 Repurchase and $1.1 million of lease payments. During 2018, cash contributions include a $20.0 million discretionary contribution, $4.0 million for the 2018 Repurchase, and $1.5 million of lease payments. Cash contributions during 2017 include $1.4 million of lease payments. While we have no federally required contributions for 2020 , we expect to make cash contributions of approximately $2 million to our pension plans. These contributions reflect benefit payments to plan participants of our nonqualified salaried pension plans and lease payments for properties we have contributed to our qualified defined benefit pension plan. Qualified pension benefit payments are paid from plan assets, while nonqualified pension benefit payments are paid by the company. The following benefit payments are expected to be paid to plan participants (in thousands): 2020 $ 3,174 2021 3,989 2022 5,008 2023 5,967 2024 6,797 Years 2025-2029 43,635

Long-Term Incentive Compensatio

Long-Term Incentive Compensation Plans	12 Months Ended
	Dec. 31, 2019
Compensation Related Costs [Abstract]
Long-Term Incentive Compensation Plans [Text Block]	Long-Term Incentive Compensation Plans Stock-Based Compensation In February 2013, we adopted the 2013 Incentive Compensation Plan (2013 Incentive Plan), which was superseded by the 2016 Boise Cascade Omnibus Incentive Plan (2016 Incentive Plan), which was approved by our stockholders and became effective in April 2016. After the effective date of the 2016 Incentive Plan, no awards were granted under the 2013 Incentive Plan. The 2016 Incentive Plan provides for grants of stock options, stock appreciation rights, restricted stock, other stock-based awards, cash-based compensation, and performance awards. Directors, officers, and other employees, as well as consultants and advisors, are eligible for grants under the 2016 Incentive Plan. These awards are at the discretion of the Compensation Committee of our board of directors, and they vest and expire in accordance with terms established at the time of grant. All awards under the 2016 Incentive Plan, other than stock options or stock appreciation rights, are eligible to participate in dividend or dividend equivalent payments, if any, which we accrue to be paid when the awards vest. Shares issued pursuant to awards under the incentive plans are from our authorized but unissued shares. The maximum number of shares approved for grant under the 2016 Incentive Plan is 3.7 million shares. In February 2019 , 2018 , and 2017 , we granted two types of stock-based awards under the 2016 Incentive Plan: performance stock units (PSUs) and restricted stock units (RSUs). As of December 31, 2019 , 2.5 million shares remained available for future issuance under the 2016 Incentive Plan. PSU and RSU Awards In 2019 , we granted 110,923 PSUs to our officers and other employees, subject to performance and service conditions, at a weighted average grant date fair value of $29.48 . For the officers, the number of shares actually awarded will range from 0% to 200% of the target amount, dependent upon Boise Cascade's 2019 return on invested capital (ROIC), as approved by our Compensation Committee in accordance with the related grant agreement. For the other employees, the number of shares actually awarded will range from 0% to 200% of the target amount, depending upon Boise Cascade's 2019 EBITDA, defined as income before interest (interest expense and interest income), income taxes, and depreciation and amortization, determined in accordance with the related grant agreement. Because the ROIC and EBITDA components contain a performance condition, we record compensation expense over the requisite service period based on the most probable number of shares expected to vest. In 2018 and 2017 , we granted 78,976 and 178,021 PSUs, at a weighted average grant date fair value of $43.05 and $27.05 , respectively, to our officers and other employees, subject to performance and service conditions. During the 2018 performance period, officers and other employees earned 100% and 110% , respectively, of the target based on Boise Cascade’s 2018 ROIC and EBITDA, determined by our Compensation Committee in accordance with the related grant agreements. During the 2017 performance period, officers and other employees earned 135% and 145% , respectively, of the target based on Boise Cascade’s 2017 ROIC and EBITDA, determined by our Compensation Committee in accordance with the related grant agreements. The PSUs granted to officers generally vest in a single installment three years from the grant date, while the PSUs granted to other employees vest in three equal tranches each year after the grant date. In 2019 , 2018 , and 2017 , we granted an aggregate of 167,861 , 99,087 , and 214,035 RSUs, at a weighted average grant date fair value of $29.13 , $43.08 , and $27.10 , respectively, to our officers, other employees, and nonemployee directors with only service conditions. The RSUs granted to officers and other employees vest in three equal tranches each year after the grant date. The RSUs granted to nonemployee directors vest over a one year period. We based the fair value of PSU and RSU awards on the closing market price of our common stock on the grant date. During the years ended December 31, 2019 , 2018 , and 2017 , the total fair value of PSUs and RSUs vested was $11.4 million , $15.4 million , and $8.5 million , respectively. The following summarizes the activity of our PSUs and RSUs awarded under our incentive plan for the year ended December 31, 2019 : PSUs RSUs Number of shares Weighted Average Grant-Date Fair Value Number of shares Weighted Average Grant-Date Fair Value Outstanding, December 31, 2018 429,788 $ 25.90 289,173 $ 29.52 Granted 110,923 29.48 167,861 29.13 Performance condition adjustment (a) 1,443 43.05 — — Vested (223,840 ) 19.97 (183,403 ) 26.44 Forfeited (22,967 ) 35.26 (16,067 ) 34.65 Outstanding, December 31, 2019 295,347 $ 31.09 257,564 $ 31.14 __________________ (a) Represents additional PSUs granted to non-officers based on achievement of 2018 EBITDA in excess of target. Compensation Expense We record compensation expense over the awards' vesting period and account for share-based award forfeitures as they occur, rather than making estimates of future forfeitures. Any shares not vested are forfeited. We recognize stock awards with only service conditions on a straight-line basis over the requisite service period. Most of our share-based compensation expense was recorded in "General and administrative expenses" in our Consolidated Statements of Operations. Total stock-based compensation recognized from PSUs and RSUs, net of forfeitures, was as follows: Year Ended December 31 2019 2018 2017 (thousands) PSUs $ 3,340 $ 4,005 $ 4,923 RSUs 4,633 4,826 4,807 Total $ 7,973 $ 8,831 $ 9,730 For the years ended December 31, 2019 , 2018 , and 2017 , the related tax benefit was $2.0 million , $2.2 million , and $2.5 million , respectively. As of December 31, 2019 , total unrecognized compensation expense related to nonvested share-based compensation arrangements was $7.3 million . This expense is expected to be recognized over a weighted-average period of 1.7 years. Long-Term Incentive Cash Plan In 2019 and 2018 , certain non-executive employees participated in a long-term incentive plan that pays awards in cash (LTI Cash Plan). The LTI Cash Plan provides an award notice to participants granting them the opportunity to earn a cash award, half of which is subject to service conditions only, with the other half subject to performance and service conditions. For the performance based cash award, the amount of cash actually awarded will range from 0% to 200% of the target amount, depending upon Boise Cascade's EBITDA, determined in accordance with the related grant agreement. Under the LTI Cash Plan, the award is paid in three equal installments each year after the grant date, with continued employment as a precondition for receipt of each award installment. We recognize compensation for cash awards with only service conditions on a straight-line basis over the requisite service period. Cash awards subject to performance conditions are also recognized on a straight-line basis over the requisite service period, based on the most probable amount of cash to be paid subject to achievement of the performance condition. In 2019 and 2018 , we recognized $2.2 million and $1.4 million , respectively, of LTIP Cash Plan expense, primarily recorded in "General and administrative expenses" in our Consolidated Statements of Operations. There was no LTIP Cash Plan expense recorded during 2017 . During the 2018 performance period, cash awards earned 110% of the target based on Boise Cascade’s 2018 EBITDA, determined by our Compensation Committee in accordance with the related grant agreement.

Stockholders' Equity

Stockholders' Equity	12 Months Ended
	Dec. 31, 2019
Stockholders' Equity Note [Abstract]
Stockholders' Equity	Stockholders' Equity Our certificate of incorporation has authorized 300,000,000 shares of common stock and 50,000,000 shares of preferred stock. No preferred stock was issued or outstanding as of December 31, 2019 and 2018 . We had 44,352,778 and 44,075,840 shares of common stock issued and 38,985,705 and 38,708,767 shares of common stock outstanding as of December 31, 2019 and 2018 , respectively. Each share of common stock entitles the holder to one vote on matters to be voted on by the stockholders of Boise Cascade. Dividends On November 14, 2017, we announced that our board of directors approved a dividend policy to pay quarterly cash dividends to holders of our common stock. Our board of directors declared and paid the following dividends during each of the respective quarters for the years ended December 31, 2019 , 2018 , and 2017 : Dividends Per Share Amount Paid 2019 (in thousands) First Quarter (a) $ 0.09 $ 4,053 Second Quarter 0.09 3,509 Third Quarter 0.09 3,508 Fourth Quarter (b) 1.10 42,884 Total $ 1.37 $ 53,954 2018 First Quarter (a) $ 0.07 $ 2,758 Second Quarter 0.07 2,723 Third Quarter (b) 1.07 41,632 Fourth Quarter 0.09 3,502 Total $ 1.30 $ 50,615 2017 First Quarter $ — $ — Second Quarter — — Third Quarter — — Fourth Quarter 0.07 2,701 Total $ 0.07 $ 2,701 __________________ (a) Includes payments of dividend equivalents on RSUs and PSUs which vested in first quarter of each year. (b) During each fourth quarter 2019 and third quarter 2018, our board of directors declared and paid a supplemental dividend of $1.00 per share of our common stock. On February 10, 2020 , our board of directors declared a dividend of $0.10 per share of our common stock, payable on March 16, 2020 , to stockholders of record on February 24, 2020 . For a description of the restrictions in our asset-based credit facility, Term Loan, and the indenture governing our senior notes on our ability to pay dividends, see Note 10, Debt . Stock Repurchase On February 25, 2015, our board of directors authorized a two million share repurchase program (Program) pursuant to which we may, from time to time, purchase shares of our common stock through various means including, without limitation, open market transactions, privately negotiated transactions, or accelerated share repurchase transactions. We are not obligated to purchase any shares and there is no set date that the Program will expire. The board may increase or decrease the number of shares under the Program or terminate the Program in its discretion at any time. During 2019 and 2017, we did not purchase any shares under the Program. During 2018, we repurchased 200,000 shares under the program at a cost of $4.9 million , or an average of $24.65 per share. The shares were purchased with cash on hand and are recorded as "Treasury stock" on our Consolidated Balance Sheet. As of December 31, 2019 , there were 496,989 shares of common stock that may yet be purchased under the Program. Accumulated Other Comprehensive Loss Changes in accumulated other comprehensive loss are as follows: Changes in Accumulated Other Comprehensive Loss Year Ended December 31 2019 2018 2017 (thousands) Beginning Balance, net of taxes $ (47,652 ) $ (76,702 ) $ (83,012 ) Net actuarial gain (loss), before taxes (4,642 ) 14,178 7,067 Amortization of actuarial (gain) loss, before taxes (a) (175 ) 1,497 1,686 Effect of settlements, before taxes (a) 1,342 23,255 — Income taxes 879 (9,880 ) (2,443 ) Ending Balance, net of taxes $ (50,248 ) $ (47,652 ) $ (76,702 ) ___________________________________ (a) Represents amounts reclassified from accumulated other comprehensive loss. These amounts are included in the computation of net periodic pension cost. For additional information, see Note 12, Retirement and Benefit Plans .

Transactions With Related Party

Transactions With Related Party	12 Months Ended
	Dec. 31, 2019
Related Party Transactions [Abstract]
Transactions With Related Parties	Transactions With Related Party Louisiana Timber Procurement Company, L.L.C. (LTP) is an unconsolidated variable-interest entity that is 50% owned by us and 50% owned by Packaging Corporation of America (PCA). LTP procures sawtimber, pulpwood, residual chips, and other residual wood fiber to meet the wood and fiber requirements of us and PCA in Louisiana. We are not the primary beneficiary of LTP as we do not have power to direct the activities that most significantly affect the economic performance of LTP. Accordingly, we do not consolidate LTP's results in our financial statements. Sales Related-party sales to LTP from our Wood Products segment in our Consolidated Statements of Operations were $16.5 million , $16.7 million , and $16.6 million , respectively, during the years ended December 31, 2019 , 2018 , and 2017 . These sales are recorded in "Sales" in our Consolidated Statements of Operations. Costs and Expenses Related-party wood fiber purchases from LTP were $81.7 million , $83.1 million , and $86.4 million , respectively, during the years ended December 31, 2019 , 2018 , and 2017 . These costs are recorded in "Materials, labor, and other operating expenses (excluding depreciation)" in our Consolidated Statements of Operations.

Financial Instrument Risk

Financial Instrument Risk	12 Months Ended
	Dec. 31, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Financial Instrument Risk	Financial Instrument Risk In the normal course of business, we are exposed to financial risks such as changes in commodity prices, interest rates, and foreign currency exchange rates. In 2019 , 2018 , and 2017 , we did not use derivative instruments to manage these risks, except for interest rate swaps entered into in 2016 as discussed below. Commodity Price Risk Many of the products we manufacture or purchase and resell and some of our key production inputs are commodities whose price is determined by the market's supply and demand for such products. Price fluctuations in our selling prices and key costs have a significant effect on our financial performance. The markets for most of these commodities are cyclical and are primarily affected by various economic and industry factors, including the strength of the U.S. housing market, net import and export activity, changes in or disruptions to industry production capacity, changes in inventory levels, and other factors beyond our control. Interest Rate Risk and Interest Rate Swaps We are exposed to interest rate risk arising from fluctuations in variable-rate LIBOR on our term loans and when we have loan amounts outstanding on our Revolving Credit Facility. At December 31, 2019 , we had $95.0 million of variable-rate debt outstanding. Our objective is to limit the variability of interest payments on our debt. To meet this objective, in 2016 we entered into receive-variable, pay-fixed interest rate swaps to change the variable-rate cash flow exposure to fixed-rate cash flows. In accordance with our risk management strategy, we actively monitor our interest rate exposure and use derivative instruments from time to time to manage the related risk. On February 16, 2016, and March 31, 2016, we entered into interest rate swap agreements with notional principal amounts of $50.0 million and $75.0 million , respectively, to offset risks associated with the variability in cash flows relating to interest payments that are based on one-month LIBOR. We do not speculate using derivative instruments. At December 31, 2019 and 2018 , the notional principal amount of our interest rate swap agreements was $95.0 million after liquidating $30.0 million of the interest rate swap with original notional principal amount of $75.0 million in November 2018. Under the interest rate swaps, we receive LIBOR-based variable interest rate payments and make fixed interest rate payments, thereby fixing the interest rate on $95.0 million of variable-rate debt exposure. Payments on the interest rate swaps with notional principal amounts of $50.0 million and $45.0 million are due on a monthly basis at an annual fixed rate of 1.007% and 1.256% , respectively, and expire in February 2022 and March 2022, respectively. The interest rate swap agreements were not designated as cash flow hedges, and as a result, all changes in the fair value are recognized in "Change in fair value of interest rate swaps" in the Consolidated Statements of Operations rather than through other comprehensive income. At December 31, 2019 and 2018 , we recorded a long-term asset of $0.8 million and $3.8 million , respectively, in "Other assets" on our Consolidated Balance Sheets, representing the fair value of the interest rate swap agreements. The swaps were valued based on observable inputs for similar assets and liabilities and other observable inputs for interest rates and yield curves (Level 2 inputs). Foreign Currency Risk

Segment Information

Segment Information	12 Months Ended
	Dec. 31, 2019
Segment Reporting [Abstract]
Segment Information	Segment Information We operate our business using two reportable segments: Wood Products and Building Materials Distribution. These segments represent distinct businesses that are managed separately because of differing products and services. Each of these businesses requires distinct operating and marketing strategies. Management reviews the performance of the company based on these segments. For a description of the products sold by our segments, see Note 3, Revenues . Unallocated corporate costs include corporate support staff services, related assets and liabilities, and pension plan activity. Support services include, but are not limited to, information technology, human resources, finance, accounting, and legal functions. Specified expenses are allocated to the segments. For many of these allocated expenses, the related assets and liabilities remain in corporate. The segments follow the accounting principles described in Note 2, Summary of Significant Accounting Policies . For the years ended December 31, 2019 , 2018 , and 2017 , no customers accounted for 10% or more of total sales. Sales to foreign unaffiliated customers were approximately $76 million , $96 million , and $94 million , respectively, for the years ended December 31, 2019 , 2018 , and 2017 . At December 31, 2019 , 2018 , and 2017 , and for the years then ended, long-lived assets located in foreign countries and net sales originating in foreign countries were not material. Wood Products and Building Materials Distribution segment sales to external customers, including related parties, by product line are as follows: Year Ended December 31 2019 2018 2017 (millions) Wood Products (a) LVL $ 39.5 $ 42.2 $ 45.5 I-joists 22.1 29.3 35.2 Other engineered wood products 26.8 25.3 22.0 Plywood and veneer 255.1 336.2 324.4 Lumber (b) 52.5 86.0 87.6 Byproducts (c) 75.1 87.3 53.2 Particleboard (b) — 37.5 46.0 Other 34.7 63.9 44.4 505.7 707.7 658.3 Building Materials Distribution Commodity 1,725.4 2,070.1 1,808.2 General line 1,580.7 1,421.5 1,269.5 Engineered wood products 831.6 796.0 696.0 4,137.7 4,287.6 3,773.7 $ 4,643.4 $ 4,995.3 $ 4,432.0 ___________________________________ (a) Amounts represent sales to external customers. Sales are calculated after intersegment sales eliminations to our Building Materials Distribution segment, as well as the cost of EWP rebates and sales allowances provided at various stages of the supply chain (including distributors, retail lumberyards, and professional builders). For the year ended December 31, 2019 , approximately 77% of Wood Products' EWP sales volumes were to our Building Materials Distribution segment. (b) In fourth quarter 2018, we sold two lumber mills and our particleboard plant located in Northeast Oregon. For additional information, see Note 7, Sale of Manufacturing Facilities . (c) As discussed in Note 3, Revenues, upon adoption of ASC Topic 606, Revenue from Contracts with Customers , under the modified retrospective method on January 1, 2018, amounts recorded in 2017 have not been adjusted. An analysis of our operations by segment is as follows: Year Ended December 31 2019 2018 2017 (thousands) Net sales by segment Wood Products $ 1,275,167 $ 1,533,270 $ 1,373,760 Building Materials Distribution 4,137,719 4,287,702 3,773,810 Intersegment eliminations and other (a) (769,482 ) (825,682 ) (715,579 ) Total net sales $ 4,643,404 $ 4,995,290 $ 4,431,991 Segment operating income (loss) Wood Products (b) $ 54,197 $ (10,022 ) $ 53,629 Building Materials Distribution 116,236 112,510 116,760 Total segment operating income 170,433 102,488 170,389 Unallocated corporate costs (33,974 ) (30,450 ) (28,976 ) Income from operations $ 136,459 $ 72,038 $ 141,413 Depreciation and amortization Wood Products (c) $ 57,671 $ 126,989 $ 63,115 Building Materials Distribution 20,769 18,280 15,504 Corporate 1,701 1,568 1,760 Total depreciation and amortization $ 80,141 $ 146,837 $ 80,379 Capital expenditures Wood Products $ 53,460 $ 53,392 $ 54,600 Building Materials Distribution (d) 40,722 51,306 19,301 Corporate 4,214 771 1,549 Total capital expenditures $ 98,396 $ 105,469 $ 75,450 __________________ (a) Primarily represents intersegment sales from our Wood Products segment to our Building Materials Distribution segment. During 2019 , 2018 , and 2017 , approximately 60% , 54% , and 52% , respectively, of Wood Products' overall sales were to our Building Materials Distribution segment. (b) Wood Products segment operating loss for the year ended December 31, 2018, includes pre-tax facility impairment and sales related losses of $35.5 million , as well as $57.8 million of accelerated depreciation and other curtailment costs related to the permanent curtailment of LVL production at our Roxboro, North Carolina facility. For more information, see Note 6, Curtailment of Manufacturing Facilities and Note 7, Sale of Manufacturing Facilities . (c) Depreciation and amortization for Wood Products includes $55.0 million of accelerated depreciation to fully depreciate the curtailed LVL production assets at our Roxboro, North Carolina facility during fourth quarter 2018. For more information, see Note 6, Curtailment of Manufacturing Facilities . (d) Capital spending in 2019 and 2018 for Building Materials Distribution includes $15.7 million and $25.5 million , respectively, for the acquisition of wholesale building material distribution locations. For more information, see Note 8, Acquisitions . December 31 2019 2018 (thousands) Assets Wood Products $ 635,475 $ 690,400 Building Materials Distribution 768,095 699,261 Corporate 289,781 191,587 Total assets $ 1,693,351 $ 1,581,248

Commitments, Legal Proceedings

Commitments, Legal Proceedings and Contingencies, and Guarantees	12 Months Ended
	Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Commitments, Legal Proceedings and Contingencies, and Guarantees	Commitments, Legal Proceedings and Contingencies, and Guarantees Commitments We have commitments for leases and long-term debt that are discussed further in Note 10, Debt , and Note 11, Leases . In addition, we have purchase obligations for goods and services, capital expenditures, and raw materials entered into in the normal course of business. We are a party to a number of long-term log supply agreements. At December 31, 2019 , our total obligation for log purchases under contracts with third parties was approximately $170 million based on fixed contract pricing or estimated current contractual index pricing for variable contracts. Under certain log supply agreements, we have the right to cancel or reduce our commitments in the event of a mill curtailment or shutdown. Future purchase prices under most of the variable-price agreements will be set quarterly or semiannually based on regional market prices. Our log requirements and our access to supply, as well as the cost of obtaining logs, are subject to change based on, among other things, the effect of governmental laws and regulations, our manufacturing operations not operating in the normal course of business, log availability, and the status of environmental appeals. Except for deposits required pursuant to log supply contracts, these obligations are not recorded in our consolidated financial statements until contract payment terms take effect. Legal Proceedings and Contingencies We are a party to legal proceedings that arise in the ordinary course of our business, including commercial liability claims, premises claims, environmental claims, and employment-related claims, among others. As of the date of this filing, we believe it is not reasonably possible that any of the legal actions against us will, individually or in the aggregate, have a material adverse effect on our financial position, results of operations, or cash flows. Guarantees We provide guarantees, indemnifications, and assurances to others. Boise Cascade Company and its subsidiaries (Boise Cascade Building Materials Distribution, L.L.C., and Boise Cascade Wood Products, L.L.C.) act as co-borrowers under our Revolving Credit Facility, ABL Term Loan, and Term Loan, described in Note 10, Debt . Their obligations are guaranteed by each of our remaining domestic subsidiaries. Boise Cascade has issued $350.0 million of 5.625% senior notes due in 2024. At December 31, 2019 , $350.0 million of the 2024 Notes were outstanding. The 2024 Notes are guaranteed by each of Boise Cascade Company's existing and future direct or indirect domestic subsidiaries that is a guarantor or co-borrower under our Revolving Credit Facility. See Note 10, Debt , for more information. Boise Cascade issued guarantees to a limited number of trade creditors of one or more of its principal operating subsidiaries, Boise Cascade Building Materials Distribution, L.L.C., and Boise Cascade Wood Products, L.L.C., for trade credit obligations arising in the ordinary course of the business of such operating subsidiaries. These included guarantees of obligations with respect to present and future log agreements of Boise Cascade Wood Products, L.L.C. and several facility leases entered into by Boise Cascade Building Materials Distribution, L.L.C. Boise Cascade's exposure under these agreements is limited to future log purchases and the minimum lease payment requirements under the agreements. All surety bonds and most letters of credit supporting obligations of subsidiaries sold or liabilities assumed by Boise Inc., which became a wholly-owned subsidiary of PCA, in connection with the sale of our Paper and Packaging & Newsprint assets in 2008 have been replaced by new surety bonds or letters of credit issued without our credit support. The principal exception is letters of credit supporting workers' compensation obligations assumed by Boise Inc., which as a matter of state law must remain in our name even though the underlying liabilities and exposures have been assumed by Boise Inc. We are entitled to an indemnification from the purchaser for liabilities with respect to such letters of credit arising from workers' compensation claims assumed by Boise Inc. and for our costs of maintaining Boise Inc.'s share of any such letter of credit. We enter into a wide range of indemnification arrangements in the ordinary course of business. At December 31, 2019 , we are not aware of any material liabilities arising from these indemnifications.

Quarterly Results of Operations

Quarterly Results of Operations (unaudited)	12 Months Ended
	Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract]
Quarterly Results of Operations (unaudited)	Quarterly Results of Operations (unaudited) 2019 First Quarter Second Quarter Third Quarter (a) Fourth Quarter (millions, except per-share amounts) Net sales $ 1,042.1 $ 1,230.1 $ 1,269.5 $ 1,101.7 Income from operations $ 21.7 $ 45.1 $ 44.9 $ 24.8 Net income $ 11.4 $ 27.7 $ 27.2 $ 14.6 Net income per common share – Basic $ 0.29 $ 0.71 $ 0.70 $ 0.37 Net income per common share – Diluted $ 0.29 $ 0.71 $ 0.69 $ 0.37 2018 First Quarter Second Quarter (b) Third Quarter (c) Fourth Quarter (d) (millions, except per-share amounts) Net sales $ 1,182.8 $ 1,408.1 $ 1,338.5 $ 1,065.8 Income (loss) from operations $ 51.8 $ 74.1 $ 30.5 $ (84.3 ) Net income (loss) $ 37.1 $ 41.8 $ 13.8 $ (72.2 ) Net income (loss) per common share – Basic $ 0.96 $ 1.07 $ 0.36 $ (1.85 ) Net income (loss) per common share – Diluted $ 0.94 $ 1.06 $ 0.35 $ (1.85 ) __________________ (a) Third quarter 2019 results include $1.3 million of pre-tax losses, or $0.03 per share after-tax, from a non-cash pension settlement charge as discussed in Note 12, Retirement and Benefit Plans . (b) Second quarter 2018 results include $12.0 million of pre-tax losses, or $0.23 per share after-tax, from a non-cash pension settlement charge as discussed in Note 12, Retirement and Benefit Plans . (c) Third quarter 2018 results include $11.3 million of pre-tax losses, or $0.21 per share after-tax, from a non-cash pension settlement charge and $11.0 million of pre-tax losses, or $0.21 per share after-tax, from impairment losses on assets held for sale in Northeast Oregon. For additional information, see Note 12, Retirement and Benefit Plans and Note 7, Sale of Manufacturing Facilities . (d) Fourth quarter 2018 results include $57.8 million of pre-tax expenses, or $1.11 per share after-tax, for accelerated depreciation and other curtailment costs related to the permanent curtailment of LVL production at our Roxboro, North Carolina facility as discussed in Note 6, Curtailment of Manufacturing Facilities . Fourth quarter 2018 also includes $24.0 million of pre-tax losses, or $0.46 per share after-tax, from an impairment loss and other sale related costs on our hardwood plywood facility in Moncure, North Carolina upon being classified as held for sale, as discussed in Note 7, Sale of Manufacturing Facilities .

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2019
Accounting Policies [Abstract]
Principles of Consolidation [Policy Text Block]	Principles of Consolidation The consolidated financial statements include the accounts of Boise Cascade and its subsidiaries. Intercompany balances and transactions have been eliminated.
Use of Estimates [Policy Text Block]	Use of Estimates The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America (GAAP) requires management to make estimates and assumptions about future events. These estimates and the underlying assumptions affect the amounts of assets and liabilities reported, disclosures about contingent assets and liabilities, and reported amounts of revenues and expenses. Such estimates include the valuation of accounts receivable, inventories, goodwill, intangible assets, and other long-lived assets; legal contingencies; guarantee obligations; indemnifications; assumptions used in retirement, medical, and workers' compensation benefits; assumptions used in the determination of right-of-use assets and related lease liabilities; stock-based compensation; fair value measurements; income taxes; and vendor and customer rebates, among others. These estimates and assumptions are based on management's best estimates and judgment. Management evaluates its estimates and assumptions on an ongoing basis using historical experience and other factors, including the current economic environment, which management believes to be reasonable under the circumstances. We adjust such estimates and assumptions when facts and circumstances dictate. As future events and their effects cannot be determined with precision, actual results could differ significantly from these estimates. Changes in these estimates resulting from continuing changes in the economic environment will be reflected in the consolidated financial statements in future periods.
Revenue Recognition [Policy Text Block]	Revenue Recognition Wood Products Segment Our Wood Products segment manufactures EWP, consisting of laminated veneer lumber (LVL), I-joists, and laminated beams, which are structural products used in applications where extra strength and consistent quality are required, such as headers and beams. LVL is also used in the manufacture of I-joists, which are assembled by combining a vertical web of oriented strand board (OSB) with top and bottom LVL or solid wood flanges. In addition, we manufacture structural, appearance, and industrial plywood panels. Our wood products are used primarily in new residential construction, residential repair-and-remodeling markets, and light commercial construction. The majority of our wood products are sold to leading wholesalers (including our Building Materials Distribution segment), home improvement centers, retail lumberyards, and industrial converters. For EWP, plywood and veneer, byproducts, and other products, we transfer control and recognize a sale when we ship the product from our manufacturing facility to our customer. Control transfers when product is shipped because the customer has legal title, a present obligation to pay, and risk and rewards of ownership. The amount of consideration we receive and revenue we recognize varies with changes in rebates and cash discounts we offer to our customers. See "Rebates and Cash Discounts" below. Building Materials Distribution Segment Our Building Materials Distribution segment is a leading national stocking wholesale distributor of building materials. We distribute a broad line of building materials, including OSB, plywood, and lumber (collectively referred to as commodities); general line items such as siding, composite decking, doors, metal products, insulation, and roofing; and EWP. Except for EWP, we purchase most of these building materials from third-party suppliers and market them primarily to retail lumberyards, home improvement centers, and specialty distributors that then sell the products to the final end customers, who are typically professional builders, independent contractors, and homeowners engaged in residential construction projects. Substantially all of Building Materials Distribution's EWP is sourced from our Wood Products segment. We sell products using two primary distribution methods: warehouse sales and direct sales. Warehouse sales are distributed from our warehouses to our customers. Direct sales are shipped from the manufacturer to the customer without us taking physical possession of inventory. We report direct sales on a gross basis, that is, the amounts billed to our customers are recorded as "Sales," and inventory purchased from manufacturers are recorded as "Materials, labor, and other operating expenses (excluding depreciation)." We are the principal of direct sales because we control the inventory, as we have the ability to direct its use before it is transferred to our customers. For warehouse sales, we transfer control and recognize a sale when the customer takes physical possession of the product. Control transfers when the customer takes physical possession of the product because the customer has legal title, a present obligation to pay, and risk and rewards of ownership. For direct sales, we transfer control and recognize a sale when the product is shipped from the manufacturer to the customer. Control transfers when product is shipped because the customer has legal title, a present obligation to pay, and risk and rewards of ownership. The amount of consideration we receive and revenue we recognize varies with changes in customer rebates and cash discounts we offer to our customers. See "Rebates and Cash Discounts" below. Rebates and Cash Discounts Rebates are provided to our customers and our customers' customers based on the volume of their purchases, among other factors such as customer loyalty, conversion, and commitment. We provide the rebates to increase the sell-through of our products. Rebates are generally estimated based on the expected amount to be paid and recorded as a decrease in "Sales." At December 31, 2019 and 2018 , we had $49.4 million and $52.1 million , respectively, of rebates payable to our customers recorded in "Accrued liabilities, Other" on our Consolidated Balance Sheets. We estimate the expected cash discounts based on an analysis of historical experience and record cash discounts as a decrease in "Sales." We adjust our estimate of revenue at the earlier of when the probability of rebates paid and cash discounts provided changes or when the amounts become fixed. There have not been and we believe that there will not be significant changes to our estimates of variable consideration. Shipping and Handling Fees for shipping and handling charged to customers for sales transactions are included in "Sales" in our Consolidated Statements of Operations. When control over products has transferred to the customer, we have elected to recognize costs related to shipping and handling as fulfillment costs. For our Wood Products segment, costs related to shipping and handling are included in "Materials, labor, and other operating expenses (excluding depreciation)" in our Consolidated Statements of Operations. In our Wood Products segment, we view our shipping and handling costs as a cost of the manufacturing process and the movement of product to our end customers. For our Building Materials Distribution segment, costs related to shipping and handling of $169.2 million , $156.5 million , and $139.4 million for the years ended December 31, 2019 , 2018 , and 2017 , respectively, are included in "Selling and distribution expenses" in our Consolidated Statements of Operations. In our Building Materials Distribution segment, our activities relate to the purchase and resale of finished product, and excluding shipping and handling costs from “Materials, labor, and other operating expenses (excluding depreciation)” provides us a clearer view of our operating performance and the effectiveness of our sales and purchasing functions. Other Our payment terms vary by the type of customer and the products offered. The term between invoicing and when payment is due is not significant.
Cash and Cash Equivalents [Policy Text Block]	Cash and Cash Equivalents Cash equivalents consist of short-term investments that have a maturity of three months or less at the date of purchase. At December 31, 2019 and 2018 , the majority of our cash and cash equivalents were invested in money market funds that are broadly diversified and invested in high-quality, short-duration securities, including commercial paper, certificates of deposit, U.S. government agency securities, and similar instruments. We have significant amounts of cash and cash equivalents that are in excess of federally insured limits. Though we have not experienced any losses on our cash and cash equivalents to date and we do not anticipate incurring any losses, we cannot be assured that we will not experience losses on our cash and cash equivalents.
Trade Accounts Receivables and Allowance for Doubtful Accounts [Policy Text Block]	Trade Accounts Receivables and Allowance for Doubtful Accounts Trade accounts receivable are stated at the amount we expect to collect. Trade accounts receivable do not bear interest. We make ongoing estimates relating to the collectibility of our accounts receivable and maintain a reserve for estimated losses resulting from the inability of our customers to meet their financial obligations to us. At December 31, 2019 and 2018 , we had $0.6 million and $1.1 million , respectively, recorded as allowances for doubtful accounts. In determining the amount of the reserve and in order to manage credit risk, we consider our historical level of credit losses, customer concentrations, and current economic trends and monitor the creditworthiness of significant customers based on ongoing credit evaluations. Our sales are principally to customers in the building products industry located in the U.S. and Canada. A significant portion of our sales are concentrated with a relatively small number of customers. In 2019 , our top ten customers represented approximately 40% of sales, with no customer accounting for 10% or more of total sales. At December 31, 2019 , receivables from two customers accounted for approximately 14% and 12% of total receivables. At December 31, 2018 , receivables from these two customers accounted for approximately 13% and 11% of total receivables. No other customer accounted for 10% or more of total receivables. Adjustments to the valuation allowance are charged to income. Trade accounts receivable balances that remain outstanding after we have used reasonable collection efforts are written off through a charge to the valuation allowance and a credit to accounts receivable. Although we have not experienced material credit losses in recent years, our actual future losses from uncollectible accounts may differ materially from our current estimates. As additional information becomes known, we may change our estimates. In the event we determine that a change in the reserve is appropriate, we will record a charge to "Selling and distribution expenses" in our Consolidated Statements of Operations in the period we make such a determination.
Fair Value [Policy Text Block]	Fair Value
Financial Instruments [Policy Text Block]	Financial Instruments Our financial instruments are cash and cash equivalents, accounts receivable, accounts payable, long-term debt, and interest rate swaps. Our cash is recorded at cost, which approximates fair value, and our cash equivalents are money market funds. As of December 31, 2019 and 2018 , we held $259.5 million and $160.4 million , respectively, in money market funds that are measured at fair value on a recurring basis using Level 1 inputs. The recorded values of accounts receivable and accounts payable approximate fair values based on their short-term nature. At December 31, 2019 and 2018 , the book value of our fixed-rate debt for each period was $350.0 million , and the fair value was estimated to be $364.7 million and $328.1 million , respectively. The difference between the book value and the fair value is derived from the difference between the period-end market interest rate and the stated rate of our fixed-rate, long-term debt. We estimated the fair value of our fixed-rate debt using quoted market prices of our debt in inactive markets (Level 2 inputs). The interest rate on our term loans is based on market conditions such as the London Interbank Offered Rate (LIBOR) or a base rate. Because the interest rate on the term loans is based on current market conditions, we believe that the estimated fair value of the outstanding balance on our term loans approximates book value.
Vendor Rebates and Allowances [Policy Text Block]	Rebates and allowances received from our vendors are recognized as a reduction of "Materials, labor, and other operating expenses (excluding depreciation)" when the product is sold, unless the rebates and allowances are linked to a specific incremental cost to sell a vendor's product. Amounts received from vendors that are linked to specific selling and distribution expenses are recognized as a reduction of "Selling and distribution expenses" in the period the expense is incurred.
Foreign Currency [Policy Text Block]	Foreign Currency The functional currency for our operations outside the United States is the U.S. dollar. Nonmonetary assets and liabilities and related depreciation and amortization for these foreign operations are remeasured into U.S. dollars using historical exchange rates. Monetary assets and liabilities are remeasured into U.S. dollars using the exchange rates as of the Consolidated Balance Sheet date. Revenue and expense items are remeasured into U.S. dollars using an average exchange rate prevailing during the year.
Income Tax [Policy Text Block]	Income Taxes We account for income taxes under the asset and liability method. Deferred tax assets and liabilities are recognized for the future tax consequences attributable to temporary differences between the financial statement carrying amounts of existing assets and liabilities and respective tax bases and operating loss and tax credit carryforwards, as measured using enacted tax rates expected to be in effect in the periods where temporary differences are expected to be realized or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date. We recognize deferred tax assets to the extent that we believe that these assets are more likely than not to be realized. In making such a determination, we consider all available positive and negative evidence, including future reversals of existing taxable temporary differences, projected future taxable income, tax-planning strategies, and results of recent operations. If we determine that we would be unable to realize our deferred tax assets in the future, we would make an adjustment to the deferred tax asset valuation allowance, which would increase the provision for income taxes. We review and update our tax positions as necessary to add any new uncertain tax positions taken, or to remove previously identified uncertain positions that have been adequately resolved. Additionally, uncertain positions may be remeasured as warranted by changes in facts or law. Accounting for uncertain tax positions requires estimating the amount, timing and likelihood of ultimate settlement. Although we believe that these estimates are reasonable, actual results could differ from these estimates.
Inventory Valuation [Policy Text Block]	Inventory Valuation Inventories are valued at the lower of cost or net realizable value. Cost is based on the first-in, first-out (FIFO) method of inventory valuation or average cost. Wholesale distribution inventories include costs incurred in bringing inventory to its existing location. Manufactured inventories include costs for materials, labor, and factory overhead. Log inventories include costs to harvest and deliver the logs.
Property and Equipment [Policy Text Block]	Property and Equipment Property and equipment are recorded at cost. Cost includes expenditures for major improvements and replacements and the amount of interest cost associated with significant capital additions. For the years ended December 31, 2019 , 2018 , and 2017 , an insignificant amount of interest was capitalized. We expense all repair and maintenance costs as incurred. When property and equipment are retired, sold, or otherwise disposed of, the asset's carrying amount and related accumulated depreciation are removed from the accounts and any gain or loss is included in income (loss). We use the straight-line method of depreciation.
Long-Lived Asset Impairment [Policy Text Block]	Long-Lived Asset Impairment
Goodwill and Intangible Assets [Policy Text Block]	Goodwill and Intangible Assets Impairment We maintain two reporting units for purposes of our goodwill impairment testing, Wood Products and Building Materials Distribution, which are the same as our operating segments discussed in Note 17, Segment Information . We test goodwill in each of our reporting units and intangible assets with indefinite lives for impairment annually in the fourth quarter or sooner if events or changes in circumstances indicate that the carrying value of the asset may exceed fair value. We also evaluate the remaining useful lives of our finite-lived purchased intangible assets to determine whether any adjustments to the useful lives are necessary. We completed our annual assessment of goodwill in fourth quarter 2019 using a qualitative approach. The qualitative goodwill impairment assessment requires evaluating factors, based on the weight of evidence, to determine whether a reporting unit's carrying value would more likely than not exceed its fair value. As part of our goodwill qualitative testing process for each reporting unit, we evaluate various factors that are specific to the reporting unit as well as industry and macroeconomic factors in order to determine whether it is reasonably likely to have a material impact on the fair value of our reporting units. Based on the qualitative analysis performed in 2019 , we concluded that there were no changes that were reasonably likely to cause the fair value of the reporting units to be less than the reporting units' carrying value and determined that there was no
Asset Retirement Obligations [Policy Text Block]	Asset Retirement Obligations We recognize our asset retirement obligations in the period in which they are incurred if sufficient information is available to reasonably estimate the fair value of the obligation. Fair value estimates are determined using Level 3 inputs in the fair value hierarchy. The fair values of our asset retirement obligations are measured using expected future cash outflows discounted using the company's credit-adjusted risk-free interest rate. When we record the liability, we capitalize the cost by increasing the carrying amount of the related long-lived asset. Over time, the liability is accreted to its settlement value, and the capitalized cost is depreciated over the useful life of the related asset. Upon settlement of the liability, we will recognize a gain or loss for any difference between the settlement amount and the liability recorded.
Pension and Other Postretirement Benefits [Policy Text Block]	Pension Benefits
Deferred Software Costs [Policy Text Block]	Deferred Software Costs We defer internal-use software costs that benefit future years. These costs are amortized using the straight-line method over the expected life of the software, typically three to five years
Self-Insurance [Policy Text Block]	Self-Insurance
New and Recently Adopted Accounting Standards [Policy Text Block]	New and Recently Adopted Accounting Standards In December 2019, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes , which is intended to reduce complexity in accounting for income taxes. This ASU removes certain exceptions to the general principles in Topic 740 and also clarifies and amends existing guidance to improve consistent application. The updated guidance is effective for interim and annual reporting periods beginning after December 15, 2020, with early adoption permitted. We are currently evaluating the effects of this ASU on our consolidated financial statements. In August 2018, the FASB issued ASU 2018-15, Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40): Customer's Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract . This ASU provides guidance on implementation costs incurred in a cloud computing arrangement (CCA) that is a service contract. The guidance aligns the accounting for such costs with the guidance on capitalizing costs associated with developing or obtaining internal-use software. Specifically, the ASU amends ASC 350 to include in its scope implementation costs of a CCA that is a service contract and clarifies that a customer should apply ASC 350-40 to determine which implementation costs should be capitalized in such a CCA. The updated guidance is effective for interim and annual reporting periods beginning after December 15, 2019. We do not expect this guidance to have a material effect on our consolidated financial statements. In August 2018, the FASB issued ASU 2018-14, Compensation - Retirement Benefits - Defined Benefit Plans - General (Topic 715-20): Disclosure Framework - Changes to the Disclosure Requirements for Defined Benefit Plans . This ASU amends ASC 715 to remove disclosures that are no longer considered cost beneficial, clarifies the specific requirements of disclosures, and adds disclosure requirements identified as relevant related to defined benefit pension and other postretirement plans. The ASU's changes related to disclosures are part of the FASB's disclosure framework project. The updated guidance is effective retrospectively for annual reporting periods ending after December 15, 2020, with early adoption permitted. We are currently evaluating the effects of this ASU on our disclosures in the notes to our consolidated financial statements. In August 2018, the FASB issued ASU 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement . This ASU amends ASC 820 to remove disclosures that are no longer considered cost beneficial, clarifies the specific requirements of disclosures, and adds disclosure requirements identified as relevant related to recurring and nonrecurring fair value measurements. The ASU's changes related to disclosures are part of the FASB's disclosure framework project. The updated guidance is effective for interim and annual reporting periods beginning after December 15, 2019. We do not expect this guidance to have a material effect on our disclosures in the notes to our consolidated financial statements. In June 2016, the FASB issued ASU 2016-13, Financial Instruments - Credit Losses (Topic 326) . This ASU sets forth a "current expected credit loss" (CECL) model which requires the measurement of all expected credit losses for financial instruments or other assets (e.g. trade receivables), held at the reporting date based on historical experience, current conditions, and reasonable supportable forecasts. This replaces the existing incurred loss model and is applicable to the measurement of credit losses on financial assets measured at amortized cost and applies to some off-balance sheet credit exposures. ASU 2016-13 also requires enhanced disclosures to help financial statement users better understand significant estimates and judgments used in estimating credit losses, as well as the credit quality and underwriting standards of an entity's portfolio. This ASU is effective for annual reporting periods ending after December 15, 2019, using a modified retrospective approach. The adoption of this standard in fourth quarter of 2019 did not have a material effect on our consolidated financial statements. In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842) . This amendment requires a lessee to recognize a right-of-use (ROU) asset and an associated lease liability on the balance sheet for all leases (whether operating or finance leases) with a term longer than 12 months. For leases defined as finance leases under the new standard, the lessee subsequently recognizes interest expense and amortization of the ROU asset, similar to accounting for capital leases under the previous lease standard. For leases defined as operating leases under the new standard, the lessee subsequently recognizes straight-line lease expense over the life of the lease. We adopted this standard effective January 1, 2019. The new lease standard had a material impact on our consolidated balance sheets, but did not have a material impact on our consolidated statements of operations or cash flows. The most significant impact was the recognition of ROU assets and lease liabilities for operating leases. See Note 11, Leases , for additional information on the impact of this standard on our accounting for leases and additional required qualitative disclosures of our lease policies. There were no other accounting standards recently issued that had or are expected to have a material impact on our consolidated financial statements and associated disclosures.
Revenue, Transaction Price Measurement, Tax Exclusion [Policy Text Block]	Sales, value add, and other taxes we collect concurrent with revenue-producing activities are excluded from revenue.
Commissions Expense, Policy [Policy Text Block]	We expense sales commissions when incurred as they are earned when the product is shipped. These costs are recorded within "Selling and distribution expenses."
Leases [Policy Text Block]	Leases We primarily lease land, building, and equipment under operating and finance leases. We determine if an arrangement is a lease at inception and assess lease classification as either operating or finance at lease inception or upon modification. Substantially all of our leases with initial terms greater than one year are for real estate, including distribution centers, corporate headquarters, land, and other office space. Substantially all of these lease agreements have fixed payment terms based on the passage of time and are recorded in our Building Materials Distribution segment. Many of our leases include fixed escalation clauses, renewal options and/or termination options that are factored into our determination of lease term and lease payments when appropriate. Renewal options generally range from one to ten years with fixed payment terms similar to those in the original lease agreements. Some lease agreements provide us with the option to purchase the leased property at market value. Our lease agreements do not contain any residual value guarantees. ROU assets represent our right to use an underlying asset for the lease term and lease liabilities represent our obligation to make lease payments arising from the lease. ROU assets and lease liabilities are recognized at the lease commencement date based on the estimated present value of fixed lease payments over the lease term. The current portion of our operating and finance lease liabilities are recorded in "Accrued liabilities, Other" on our Consolidated Balance Sheets. We use our estimated incremental borrowing rate, which is derived from information available at the lease commencement date, in determining the present value of lease payments. In determining our incremental borrowing rates, we give consideration to publicly available interest rates for instruments with similar characteristics. For purposes of determining straight-line rent expense, the lease term is calculated from the date we first take possession of the facility, including any periods of free rent and any renewal option periods we are reasonably certain of exercising. Variable lease expense generally includes reimbursement of actual costs for common area maintenance, property taxes, and insurance on leased real estate and are recorded as incurred. Most of our operating lease expense was recorded in "Selling and distribution expenses" in our Consolidated Statements of Operations. The new standard provides practical expedients for an entity’s ongoing accounting. We elected the practical expedient to not separate lease and non-lease components for all of our leases. We also elected the short-term lease recognition exemption for all leases that qualify. This means, for those leases that qualify, we will not recognize ROU assets or lease liabilities, and this includes not recognizing ROU assets or lease liabilities for existing short-term leases in transition. Our short-term leases primarily include equipment rentals with lease terms on a month-to-month basis, which provide for our seasonal needs and flexibility in the use of equipment. Our short-term leases also include certain real estate for which either party has the right to cancel upon providing notice of 30 to 90 days.
Compensation Related Costs [Policy Text Block]	We record compensation expense over the awards' vesting period and account for share-based award forfeitures as they occur, rather than making estimates of future forfeitures. Any shares not vested are forfeited. We recognize stock awards with only service conditions on a straight-line basis over the requisite service period.
Derivatives [Policy Text Block]	In accordance with our risk management strategy, we actively monitor our interest rate exposure and use derivative instruments from time to time to manage the related risk.
Segment Reporting [Policy Text Block]	Unallocated corporate costs include corporate support staff services, related assets and liabilities, and pension plan activity. Support services include, but are not limited to, information technology, human resources, finance, accounting, and legal functions. Specified expenses are allocated to the segments. For many of these allocated expenses, the related assets and liabilities remain in corporate.

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2019
Accounting Policies [Abstract]
Inventories [Table Text Block]	Inventories included the following (work in process is not material): December 31, December 31, (thousands) Finished goods and work in process $ 413,020 $ 441,774 Logs 45,574 54,301 Other raw materials and supplies 39,002 36,974 $ 497,596 $ 533,049
Property and Equipment [Table Text Block]	Property and equipment consisted of the following asset classes with the following general range of estimated useful lives: December 31, December 31, General Range of Estimated Useful Lives in Years (thousands) Land $ 39,304 $ 38,888 Buildings (a) 140,008 164,878 20 - 40 Improvements 61,187 49,509 10 - 15 Mobile equipment, information technology, and office furniture 165,445 150,712 3 - 7 Machinery and equipment 666,467 629,337 7 - 12 Construction in progress 34,846 31,015 1,107,257 1,064,339 Less accumulated depreciation (630,308 ) (577,115 ) $ 476,949 $ 487,224 ___________________________________ (a) As of December 31, 2018, capital lease assets were included in the "Buildings" asset class. For additional information related to leases, see Note 11, Leases .

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Income before Income Tax, Domestic and Foreign [Table Text Block]	Income before income taxes includes the following components: Year Ended December 31 2019 2018 2017 (thousands) Domestic $ 105,341 $ 21,704 $ 115,083 Foreign 2,890 398 2,505 Income before income taxes $ 108,231 $ 22,102 $ 117,588
Income Tax Provision [Table Text Block]	The income tax provision shown in the Consolidated Statements of Operations includes the following: Year Ended December 31 2019 2018 2017 (thousands) Current income tax provision (benefit) Federal $ 13,700 $ 6,459 $ 22,541 State 4,574 3,126 3,973 Foreign 7 5 — Total current 18,281 9,590 26,514 Deferred income tax provision (benefit) Federal 7,430 (5,987 ) 6,747 State 925 (2,127 ) 991 Foreign 670 149 379 Total deferred 9,025 (7,965 ) 8,117 Income tax provision $ 27,306 $ 1,625 $ 34,631
Income Tax Rate Reconciliation [Table Text Block]	The effective tax rate varies from the U.S. Federal statutory income tax rate principally due to the following: Year Ended December 31 2019 2018 2017 (thousands, except percentages) Income before income taxes $ 108,231 $ 22,102 $ 117,588 Statutory U.S. income tax rate (a) 21.0 % 21.0 % 35.0 % Statutory tax provision $ 22,728 $ 4,642 $ 41,156 State taxes 4,390 741 3,719 Domestic production activities deduction — — (963 ) Unrecognized tax benefits (178 ) (181 ) (86 ) Benefit from enactment of the Tax Act (b) — (3,806 ) (8,129 ) Tax credits (725 ) (272 ) (912 ) Foreign rate differential 71 432 (366 ) Share-based compensation (532 ) (1,718 ) (413 ) Nondeductible executive compensation 852 366 — Meals and entertainment 738 886 663 Other (38 ) 535 (38 ) Total $ 27,306 $ 1,625 $ 34,631 Effective income tax rate 25.2 % 7.4 % 29.5 % ______________________________________ (a) On December 22, 2017, the Tax Cuts and Jobs Act (the “Tax Act”), was enacted by the U.S. government. The most significant impact to our financial statements was the reduction of the corporate federal income tax rate from 35% to 21% . (b) As of December 31, 2018, we completed our assessment of the effects of the Tax Act on our financial statements. In connection with our analysis of the Tax Act, we recorded discrete tax benefits of $3.8 million and $8.1 million , respectively, during the years ended December 31, 2018 and 2017. The $3.8 million reduction in income tax expense resulted from the remeasurement of deferred income taxes to the new federal statutory rate of 21% , which mostly relates to a $20.0 million discretionary pension contribution made during 2018, for which we received a tax deduction at the 2017 federal income tax rate. The $8.1 million reduction in income tax expense resulted from the remeasurement of deferred income taxes to the new federal statutory rate of 21% .
Net Deferred Tax Assets and Liabilities [Table Text Block]	The components of our net deferred tax assets and liabilities at December 31, 2019 and 2018 , are summarized as follows: December 31, 2019 December 31, 2018 (thousands) Deferred tax assets Employee benefits $ 26,914 $ 27,149 Lease liabilities 23,241 — Capital leases — 5,742 Inventories 3,358 2,649 Foreign net operating loss carryforward 1,514 3,108 Other 6,256 6,461 Net deferred tax assets $ 61,283 $ 45,109 Deferred tax liabilities Property and equipment $ (50,751 ) $ (48,302 ) Right-of-use assets (21,753 ) — Intangible assets and other (5,924 ) (5,369 ) Other (1,597 ) (2,445 ) Deferred tax liabilities $ (80,025 ) $ (56,116 ) Total deferred tax liabilities, net $ (18,742 ) $ (11,007 )
Unrecognized Tax Benefits Roll Forward [Table Text Block]	The following table summarizes the changes related to our gross unrecognized tax benefits excluding interest and penalties: 2019 2018 2017 (thousands) Balance as of January 1 $ 1,850 $ 2,083 $ 2,224 Increases related to prior years' tax positions — 13 1 Increases related to current year tax positions 53 — 51 Decreases related to prior years' tax positions — (43 ) (12 ) Lapse of statute of limitations (218 ) (203 ) (181 ) Balance as of December 31 $ 1,685 $ 1,850 $ 2,083

Net Income Per Common Share (Ta

Net Income Per Common Share (Tables)	12 Months Ended
	Dec. 31, 2019
Earnings Per Share [Abstract]
Net Income Per Common Share [Table Text Block]	The following table sets forth the computation of basic and diluted net income per common share: Year Ended December 31 2019 2018 2017 (thousands, except per-share data) Net income $ 80,925 $ 20,477 $ 82,957 Weighted average common shares outstanding during the period (for basic calculation) 39,039 38,932 38,623 Dilutive effect of other potential common shares 203 455 451 Weighted average common shares and potential common shares (for diluted calculation) 39,242 39,387 39,074 Net income per common share - Basic $ 2.07 $ 0.53 $ 2.15 Net income per common share - Diluted $ 2.06 $ 0.52 $ 2.12

Acquisitions (Tables)

Acquisitions (Tables)	12 Months Ended
	Dec. 31, 2019
Business Combinations [Abstract]
Fair Value at the Date of Acquisition [Table Text Block]	The following table summarizes the final allocations of the purchase price to the assets acquired and liabilities assumed, based on our estimates of the fair value at the acquisition date: Acquisition Date Fair Value (thousands) Accounts receivable $ 5,563 Inventories 3,395 Other assets 8 Property and equipment 3,487 Lease right-of-use assets 359 Intangible assets: Customer relationships 2,100 Goodwill 1,223 Assets acquired 16,135 Accounts payable 100 Lease liabilities 359 Liabilities assumed 459 Net assets acquired $ 15,676 During the year ended December 31, 2018, our wholly owned subsidiary, Boise Cascade Building Materials Distribution, L.L.C., completed the acquisition of wholesale building material distribution locations in Nashville, Tennessee, Medford, Oregon, and Cincinnati, Ohio (collectively, the 2018 Acquisitions). The purchase price of the 2018 Acquisitions was $25.5 million .

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill [Table Text Block]	The carrying amount of our goodwill by segment is as follows: Building Wood Products Total (thousands) Balance at December 31, 2018 $ 10,569 $ 48,590 $ 59,159 Additions 1,223 (a) — 1,223 Balance at December 31, 2019 $ 11,792 $ 48,590 $ 60,382 ______________________________________ (a) Represents the acquisition of a wholesale building material distribution location. For additional information, see Note 8, Acquisitions .
Schedule of Indefinite-Lived Intangible Assets [Table Text Block]	Intangible assets consisted of the following: December 31, 2019 Gross Carrying Amount Accumulated Amortization Net Carrying Amount (thousands) Trade names and trademarks $ 8,900 $ — $ 8,900 Customer relationships 12,450 (3,553 ) 8,897 $ 21,350 $ (3,553 ) $ 17,797 December 31, 2018 Gross Carrying Amount Accumulated Amortization Net Carrying Amount (thousands) Trade names and trademarks $ 8,900 $ — $ 8,900 Customer relationships 10,350 (2,399 ) 7,951 $ 19,250 $ (2,399 ) $ 16,851
Schedule of Finite-Lived Intangible Assets [Table Text Block]	Intangible assets consisted of the following: December 31, 2019 Gross Carrying Amount Accumulated Amortization Net Carrying Amount (thousands) Trade names and trademarks $ 8,900 $ — $ 8,900 Customer relationships 12,450 (3,553 ) 8,897 $ 21,350 $ (3,553 ) $ 17,797 December 31, 2018 Gross Carrying Amount Accumulated Amortization Net Carrying Amount (thousands) Trade names and trademarks $ 8,900 $ — $ 8,900 Customer relationships 10,350 (2,399 ) 7,951 $ 19,250 $ (2,399 ) $ 16,851

Debt (Tables)

Debt (Tables)	12 Months Ended
	Dec. 31, 2019
Debt Disclosure [Abstract]
Debt [Table Text Block]	Long-term debt consisted of the following: December 31, December 31, (thousands) Asset-based revolving credit facility $ — $ — Asset-based credit facility term loan due 2022 50,000 50,000 Term loan due 2026 45,000 45,000 5.625% senior notes due 2024 350,000 350,000 Deferred financing costs (4,456 ) (5,572 ) Long-term debt $ 440,544 $ 439,428
Schedule of Maturities of Long-term Debt [Table Text Block]	At December 31, 2019 , the maturities for the aggregate amount of long-term debt outstanding were as follows (in thousands): 2020 $ — 2021 — 2022 50,000 2023 — 2024 350,000 Thereafter 45,000

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 31, 2019
Leases [Abstract]
Adoption of Topic 842 [Table Text Block]	The effect of the changes made to our consolidated balance sheet as of January 1, 2019, for the adoption of the new lease standard was as follows: Balance at December 31, 2018 Adjustments Due to ASC 842 Balance at January 1, 2019 (thousands) ASSETS Property and equipment, net $ 487,224 $ (21,732 ) $ 465,492 Operating lease right-of-use assets — 69,155 69,155 Finance lease right-of-use assets — 20,872 20,872 Prepaid expenses and other 31,818 (246 ) 31,572 LIABILITIES Accrued liabilities, other 63,509 8,863 72,372 Operating lease liabilities, net of current portion — 63,498 63,498 Finance lease liabilities, net of current portion — 21,921 21,921 Other long-term liabilities 38,904 (26,233 ) 12,671 In accordance with the new lease standard requirements, the disclosure of the impact of adoption on our consolidated balance sheet was as follows: December 31, 2019 As Reported Balances Without Adoption of ASC 842 Effect of Change Higher/(Lower) (thousands) ASSETS Property and equipment, net $ 476,949 $ 499,532 $ (22,583 ) Operating lease right-of-use assets 64,228 — 64,228 Finance lease right-of-use assets 21,798 — 21,798 Prepaid expenses and other 8,285 8,591 (306 ) LIABILITIES Accrued liabilities, other 69,772 60,393 9,379 Operating lease liabilities, net of current portion 58,029 — 58,029 Finance lease liabilities, net of current portion 23,419 — 23,419 Other long-term liabilities 12,757 40,447 (27,690 )
Lease Costs [Table Text Block]	The components of lease expense were as follows: Year Ended December 31, 2019 (thousands) Operating lease cost $ 13,541 Finance lease cost Amortization of right-of-use assets 1,616 Interest on lease liabilities 1,899 Variable lease cost 2,645 Short-term lease cost 4,614 Sublease income (540 ) Total lease cost $ 23,775
Lease Supplemental Cash Flow [Table Text Block]	Supplemental cash flow information related to leases was as follows: Year Ended December 31, 2019 (thousands) Cash paid for amounts included in the measurement of lease liabilities Operating cash flows from operating leases $ 13,508 Operating cash flows from finance leases 1,862 Financing cash flows from finance leases 783 Right-of-use assets obtained in exchange for lease obligations Operating leases 4,211 Finance leases 2,637
Lessee, Weighted-average Term and Discount Rate [Table Text Block]	Other information related to leases was as follows: December 31, 2019 Weighted-average remaining lease term (years) Operating leases 8 Finance leases 14 Weighted-average discount rate Operating leases (a) 6.5 % Finance leases 8.5 % ___________________________________ (a) Upon adoption of the new lease standard, discount rates used for existing leases were established at January 1, 2019.
Minimum Lease Payment Requirements for Operating Lease Liability - Topic 842 [Table Text Block]	As of December 31, 2019 , our minimum lease payment requirements for noncancelable operating and finance leases are as follows: Operating Leases Finance Leases (thousands) 2020 $ 13,344 $ 3,009 2021 12,211 3,048 2022 10,847 3,043 2023 10,521 3,071 2024 9,920 3,076 Thereafter 32,592 28,889 Total future minimum lease payments 89,435 44,136 Less: interest (22,027 ) (19,634 ) Total lease obligations 67,408 24,502 Less: current obligations (9,379 ) (1,083 ) Long-term lease obligations $ 58,029 $ 23,419 As of December 31, 2019 , the minimum lease payment amount for operating leases signed but not yet commenced was $3.9 million .
Minimum Lease Payment Requirements for Finance Lease Liability - Topic 842 [Table Text Block]	As of December 31, 2019 , our minimum lease payment requirements for noncancelable operating and finance leases are as follows: Operating Leases Finance Leases (thousands) 2020 $ 13,344 $ 3,009 2021 12,211 3,048 2022 10,847 3,043 2023 10,521 3,071 2024 9,920 3,076 Thereafter 32,592 28,889 Total future minimum lease payments 89,435 44,136 Less: interest (22,027 ) (19,634 ) Total lease obligations 67,408 24,502 Less: current obligations (9,379 ) (1,083 ) Long-term lease obligations $ 58,029 $ 23,419 As of December 31, 2019 , the minimum lease payment amount for operating leases signed but not yet commenced was $3.9 million .
Minimum Lease Payment Requirements for Operating Lease Liability - Topic 840 [Table Text Block]	As of December 31, 2018, our minimum lease payment requirements for noncancelable operating and capital leases with terms of more than one year are as follows: Operating Leases Capital Leases (thousands) 2019 $ 13,222 $ 2,578 2020 12,734 2,617 2021 11,595 2,656 2022 10,208 2,694 2023 9,800 2,740 Thereafter 40,381 30,177 Total $ 97,940 43,462 Less: interest on capital lease obligations (20,838 ) Total principal payable on capital lease obligations 22,624 Less: current obligations (703 ) Long-term capital lease obligations $ 21,921 These future minimum lease payment requirements have not been reduced by sublease income due in the future under noncancelable subleases. Minimum sublease income expected to be received in the future is not material.
Minimum Lease Payment Requirements for Capital Lease Liability - Topic 840 [Table Text Block]	As of December 31, 2018, our minimum lease payment requirements for noncancelable operating and capital leases with terms of more than one year are as follows: Operating Leases Capital Leases (thousands) 2019 $ 13,222 $ 2,578 2020 12,734 2,617 2021 11,595 2,656 2022 10,208 2,694 2023 9,800 2,740 Thereafter 40,381 30,177 Total $ 97,940 43,462 Less: interest on capital lease obligations (20,838 ) Total principal payable on capital lease obligations 22,624 Less: current obligations (703 ) Long-term capital lease obligations $ 21,921 These future minimum lease payment requirements have not been reduced by sublease income due in the future under noncancelable subleases. Minimum sublease income expected to be received in the future is not material.

Retirement and Benefit Plans (T

Retirement and Benefit Plans (Tables)	12 Months Ended
	Dec. 31, 2019
Retirement Benefits [Abstract]
Defined Benefit Obligations and Funded Status [Table Text Block]	The following table, which includes only company-sponsored defined benefit plans, reconciles the beginning and ending balances of our projected benefit obligation and fair value of plan assets. We recognize the underfunded status of our defined benefit pension plans on our Consolidated Balance Sheets. We recognize changes in funded status in the year changes occur through other comprehensive income (loss). December 31 2019 2018 (thousands) Change in benefit obligation Benefit obligation at beginning of year $ 176,852 $ 483,525 Service cost 647 794 Interest cost 7,210 11,344 Actuarial (gain) loss 29,065 (39,651 ) Group annuity transactions (a) (19,848 ) (265,137 ) Benefits paid (1,865 ) (14,023 ) Benefit obligation at end of year 192,061 176,852 Change in plan assets Fair value of plan assets at beginning of year 154,801 422,255 Actual return on plan assets 29,769 (3,968 ) Employer contributions 5,238 26,081 Group annuity transactions (a) (19,292 ) (275,544 ) Benefits paid (1,865 ) (14,023 ) Fair value of plan assets at end of year 168,651 154,801 Underfunded status $ (23,410 ) $ (22,051 ) Amounts recognized on our Consolidated Balance Sheets Current liabilities $ (878 ) $ (671 ) Noncurrent liabilities (22,532 ) (21,380 ) Net liability $ (23,410 ) $ (22,051 ) Amounts recognized in accumulated other comprehensive loss Net actuarial loss $ 15,332 $ 11,856 Prior service cost — — Net loss recognized $ 15,332 $ 11,856 ______________________________________ (a) See Defined Benefits Plans above for description of group annuity transactions.
Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block]	The components of net periodic benefit cost and other amounts recognized in other comprehensive (income) loss are as follows: Year Ended December 31 2019 2018 2017 (thousands) Net periodic benefit cost Service cost $ 647 $ 794 $ 1,204 Interest cost 7,210 11,344 17,542 Expected return on plan assets (5,903 ) (11,097 ) (18,968 ) Amortization of actuarial (gain) loss (175 ) 1,497 1,686 Plan settlement expense (a) 1,342 23,255 — Net periodic benefit cost 3,121 25,793 1,464 Changes in plan assets and benefit obligations recognized in other comprehensive (income) loss Net actuarial (gain) loss 4,642 (14,178 ) (7,067 ) Amortization of actuarial gain (loss) 175 (1,497 ) (1,686 ) Effect of settlements (1,342 ) (23,255 ) — Total recognized in other comprehensive (income) loss 3,475 (38,930 ) (8,753 ) Total recognized in net periodic cost and other comprehensive (income) loss $ 6,596 $ (13,137 ) $ (7,289 ) ______________________________________ (a) Plan settlement expense during the years ended December 31, 2019 and 2018 includes $1.3 million and $23.3 million , respectively, of settlement charges related to the transfers of pension plan assets to Prudential for the purchase of group annuity contracts.
Schedule of Net Benefit Costs [Table Text Block]	The components of net periodic benefit cost and other amounts recognized in other comprehensive (income) loss are as follows: Year Ended December 31 2019 2018 2017 (thousands) Net periodic benefit cost Service cost $ 647 $ 794 $ 1,204 Interest cost 7,210 11,344 17,542 Expected return on plan assets (5,903 ) (11,097 ) (18,968 ) Amortization of actuarial (gain) loss (175 ) 1,497 1,686 Plan settlement expense (a) 1,342 23,255 — Net periodic benefit cost 3,121 25,793 1,464 Changes in plan assets and benefit obligations recognized in other comprehensive (income) loss Net actuarial (gain) loss 4,642 (14,178 ) (7,067 ) Amortization of actuarial gain (loss) 175 (1,497 ) (1,686 ) Effect of settlements (1,342 ) (23,255 ) — Total recognized in other comprehensive (income) loss 3,475 (38,930 ) (8,753 ) Total recognized in net periodic cost and other comprehensive (income) loss $ 6,596 $ (13,137 ) $ (7,289 ) ______________________________________ (a) Plan settlement expense during the years ended December 31, 2019 and 2018 includes $1.3 million and $23.3 million , respectively, of settlement charges related to the transfers of pension plan assets to Prudential for the purchase of group annuity contracts.
Schedule of Assumptions Used [Table Text Block]	The following table presents the assumptions used in the measurement of our benefit obligations: December 31 2019 2018 Weighted average assumptions Discount rate 3.10 % 4.15 % Rate of compensation increases (b) — % — % The following table presents the assumptions used in the measurement of net periodic benefit cost: December 31 2019 2018 (a) 2017 Weighted average assumptions Discount rate 4.15 % 3.95 % / 4.05 % / 3.40 % 3.90 % Expected long-term rate of return on plan assets 3.85 % 3.85 % / 4.50 % / 4.75 % 5.00 % Rate of compensation increases (b) — % — % — % _______________________________________ (a) Prior to the remeasurements of our qualified defined benefit pension plan on April 25, 2018, and August 10, 2018, the discount rates were 3.40% and 4.05% , respectively, and the expected rates of return on plan assets were 4.75% and 4.50% , respectively. The discount rate and expected rate of return on plan assets after the August 10, 2018 remeasurement were 3.95% and 3.85% , respectively. (b) Pension benefits for all salaried employees are frozen, resulting in an assumption for the rate of compensation increase of zero . In addition to the salaried benefits being frozen, there are currently no scheduled increases in pension benefit rates applicable to past service covering the minimal number of hourly employees who continue to accrue benefits.
Schedule of Allocation of Plan Assets [Table Text Block]	The following table sets forth by level, within the fair value hierarchy, the pension plan assets, by major asset category, at fair value at December 31, 2019 and 2018 : December 31, 2019 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) (a) Significant Unobservable Inputs (Level 3) Total (thousands) Fixed-income securities (b) $ — $ 152,530 $ — $ 152,530 Multi-asset class fund (c) — 16,361 — 16,361 Total investments at fair value $ — $ 168,891 $ — 168,891 Receivables and accrued expenses, net (240 ) Fair value of plan assets $ 168,651 December 31, 2018 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) (a) Significant Unobservable Inputs (Level 3) Total (thousands) Fixed-income securities (b) $ — $ 141,930 $ — $ 141,930 Multi-asset class fund (c) — 12,431 — 12,431 Total investments at fair value $ — $ 154,361 $ — 154,361 Receivables and accrued expenses, net 440 Fair value of plan assets $ 154,801 _______________________________________ (a) Securities represent common collective trusts managed and valued by Russell Trust Company, the administrator of the funds. While the underlying assets are actively traded on an exchange, the funds are not. The investments in equity and fixed-income securities are considered to have a readily determinable fair value because the fair value per share (unit) is determined and published and is the basis for current transactions. We have the ability to redeem these securities with a 1 day notice. (b) Invested in the Russell Long Duration Fixed Income Fund at December 31, 2019 and 2018, which is designed to provide current income and capital appreciation through diversified strategies including sector rotation, modest interest rate timing, security selection, and tactical use of high-yield, emerging market bonds and other non-index securities. In addition, at December 31, 2019 and 2018, our investments in this category included the Russell 14 Year LDI Fixed Income Fund. We also were invested in the Russell 8 Year LDI Fixed Income Fund at December 31, 2019. These LDI funds invest primarily in investment grade bonds that closely match those found in discount rate curves used to value U.S. pension liabilities and seeks to provide additional incremental return through modest interest rate timing, security selection, and tactical use of non-credit sectors. In addition, at December 31, 2019 and 2018, our investments in this category included Russell STRIPS Fixed Income Funds with duration profiles of 10 , 15 , and 28 years. These funds invest in a subset of the STRIPS universe with a similar duration profile as their respective Bloomberg Barclays U.S. STRIPS Index. (c) Invested in the Russell Multi-Asset Core Plus Fund, which is designed to provide long-term growth by providing a diversified portfolio of investments that has an overall strategic allocation of 75% global equity, 15% marketable real assets, and 10% global fixed income.
Schedule of Expected Benefit Payments [Table Text Block]	Qualified pension benefit payments are paid from plan assets, while nonqualified pension benefit payments are paid by the company. The following benefit payments are expected to be paid to plan participants (in thousands): 2020 $ 3,174 2021 3,989 2022 5,008 2023 5,967 2024 6,797 Years 2025-2029 43,635

Long-Term Incentive Compensat_2

Long-Term Incentive Compensation Plans (Tables)	12 Months Ended
	Dec. 31, 2019
Compensation Related Costs [Abstract]
Schedule of Nonvested Share Activity [Table Text Block]	The following summarizes the activity of our PSUs and RSUs awarded under our incentive plan for the year ended December 31, 2019 : PSUs RSUs Number of shares Weighted Average Grant-Date Fair Value Number of shares Weighted Average Grant-Date Fair Value Outstanding, December 31, 2018 429,788 $ 25.90 289,173 $ 29.52 Granted 110,923 29.48 167,861 29.13 Performance condition adjustment (a) 1,443 43.05 — — Vested (223,840 ) 19.97 (183,403 ) 26.44 Forfeited (22,967 ) 35.26 (16,067 ) 34.65 Outstanding, December 31, 2019 295,347 $ 31.09 257,564 $ 31.14 __________________ (a) Represents additional PSUs granted to non-officers based on achievement of 2018 EBITDA in excess of target.
Stock-based compensation expense recognized [Table Text Block]	Total stock-based compensation recognized from PSUs and RSUs, net of forfeitures, was as follows: Year Ended December 31 2019 2018 2017 (thousands) PSUs $ 3,340 $ 4,005 $ 4,923 RSUs 4,633 4,826 4,807 Total $ 7,973 $ 8,831 $ 9,730

Stockholders' Equity (Tables)

Stockholders' Equity (Tables)	12 Months Ended
	Dec. 31, 2019
Stockholders' Equity Note [Abstract]
Dividends Declared [Table Text Block]	Our board of directors declared and paid the following dividends during each of the respective quarters for the years ended December 31, 2019 , 2018 , and 2017 : Dividends Per Share Amount Paid 2019 (in thousands) First Quarter (a) $ 0.09 $ 4,053 Second Quarter 0.09 3,509 Third Quarter 0.09 3,508 Fourth Quarter (b) 1.10 42,884 Total $ 1.37 $ 53,954 2018 First Quarter (a) $ 0.07 $ 2,758 Second Quarter 0.07 2,723 Third Quarter (b) 1.07 41,632 Fourth Quarter 0.09 3,502 Total $ 1.30 $ 50,615 2017 First Quarter $ — $ — Second Quarter — — Third Quarter — — Fourth Quarter 0.07 2,701 Total $ 0.07 $ 2,701 __________________ (a) Includes payments of dividend equivalents on RSUs and PSUs which vested in first quarter of each year. (b) During each fourth quarter 2019 and third quarter 2018, our board of directors declared and paid a supplemental dividend of $1.00 per share of our common stock.
Changes in Accumulated Other Comprehensive Loss [Table Text Block]	Changes in accumulated other comprehensive loss are as follows: Changes in Accumulated Other Comprehensive Loss Year Ended December 31 2019 2018 2017 (thousands) Beginning Balance, net of taxes $ (47,652 ) $ (76,702 ) $ (83,012 ) Net actuarial gain (loss), before taxes (4,642 ) 14,178 7,067 Amortization of actuarial (gain) loss, before taxes (a) (175 ) 1,497 1,686 Effect of settlements, before taxes (a) 1,342 23,255 — Income taxes 879 (9,880 ) (2,443 ) Ending Balance, net of taxes $ (50,248 ) $ (47,652 ) $ (76,702 ) ___________________________________ (a) Represents amounts reclassified from accumulated other comprehensive loss. These amounts are included in the computation of net periodic pension cost. For additional information, see Note 12, Retirement and Benefit Plans .

Segment Information (Tables)

Segment Information (Tables)	12 Months Ended
	Dec. 31, 2019
Segment Reporting [Abstract]
Sales by product line [Table Text Block]	Wood Products and Building Materials Distribution segment sales to external customers, including related parties, by product line are as follows: Year Ended December 31 2019 2018 2017 (millions) Wood Products (a) LVL $ 39.5 $ 42.2 $ 45.5 I-joists 22.1 29.3 35.2 Other engineered wood products 26.8 25.3 22.0 Plywood and veneer 255.1 336.2 324.4 Lumber (b) 52.5 86.0 87.6 Byproducts (c) 75.1 87.3 53.2 Particleboard (b) — 37.5 46.0 Other 34.7 63.9 44.4 505.7 707.7 658.3 Building Materials Distribution Commodity 1,725.4 2,070.1 1,808.2 General line 1,580.7 1,421.5 1,269.5 Engineered wood products 831.6 796.0 696.0 4,137.7 4,287.6 3,773.7 $ 4,643.4 $ 4,995.3 $ 4,432.0 ___________________________________ (a) Amounts represent sales to external customers. Sales are calculated after intersegment sales eliminations to our Building Materials Distribution segment, as well as the cost of EWP rebates and sales allowances provided at various stages of the supply chain (including distributors, retail lumberyards, and professional builders). For the year ended December 31, 2019 , approximately 77% of Wood Products' EWP sales volumes were to our Building Materials Distribution segment. (b) In fourth quarter 2018, we sold two lumber mills and our particleboard plant located in Northeast Oregon. For additional information, see Note 7, Sale of Manufacturing Facilities . (c) As discussed in Note 3, Revenues, upon adoption of ASC Topic 606, Revenue from Contracts with Customers , under the modified retrospective method on January 1, 2018, amounts recorded in 2017 have not been adjusted.
Segment information [Table Text Block]	An analysis of our operations by segment is as follows: Year Ended December 31 2019 2018 2017 (thousands) Net sales by segment Wood Products $ 1,275,167 $ 1,533,270 $ 1,373,760 Building Materials Distribution 4,137,719 4,287,702 3,773,810 Intersegment eliminations and other (a) (769,482 ) (825,682 ) (715,579 ) Total net sales $ 4,643,404 $ 4,995,290 $ 4,431,991 Segment operating income (loss) Wood Products (b) $ 54,197 $ (10,022 ) $ 53,629 Building Materials Distribution 116,236 112,510 116,760 Total segment operating income 170,433 102,488 170,389 Unallocated corporate costs (33,974 ) (30,450 ) (28,976 ) Income from operations $ 136,459 $ 72,038 $ 141,413 Depreciation and amortization Wood Products (c) $ 57,671 $ 126,989 $ 63,115 Building Materials Distribution 20,769 18,280 15,504 Corporate 1,701 1,568 1,760 Total depreciation and amortization $ 80,141 $ 146,837 $ 80,379 Capital expenditures Wood Products $ 53,460 $ 53,392 $ 54,600 Building Materials Distribution (d) 40,722 51,306 19,301 Corporate 4,214 771 1,549 Total capital expenditures $ 98,396 $ 105,469 $ 75,450 __________________ (a) Primarily represents intersegment sales from our Wood Products segment to our Building Materials Distribution segment. During 2019 , 2018 , and 2017 , approximately 60% , 54% , and 52% , respectively, of Wood Products' overall sales were to our Building Materials Distribution segment. (b) Wood Products segment operating loss for the year ended December 31, 2018, includes pre-tax facility impairment and sales related losses of $35.5 million , as well as $57.8 million of accelerated depreciation and other curtailment costs related to the permanent curtailment of LVL production at our Roxboro, North Carolina facility. For more information, see Note 6, Curtailment of Manufacturing Facilities and Note 7, Sale of Manufacturing Facilities . (c) Depreciation and amortization for Wood Products includes $55.0 million of accelerated depreciation to fully depreciate the curtailed LVL production assets at our Roxboro, North Carolina facility during fourth quarter 2018. For more information, see Note 6, Curtailment of Manufacturing Facilities . (d) Capital spending in 2019 and 2018 for Building Materials Distribution includes $15.7 million and $25.5 million , respectively, for the acquisition of wholesale building material distribution locations. For more information, see Note 8, Acquisitions . December 31 2019 2018 (thousands) Assets Wood Products $ 635,475 $ 690,400 Building Materials Distribution 768,095 699,261 Corporate 289,781 191,587 Total assets $ 1,693,351 $ 1,581,248

Quarterly Results of Operatio_2

Quarterly Results of Operations (unaudited) (Tables)	12 Months Ended
	Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract]
Quarterly Results of Operations (unaudited) [Table Text Block]	2019 First Quarter Second Quarter Third Quarter (a) Fourth Quarter (millions, except per-share amounts) Net sales $ 1,042.1 $ 1,230.1 $ 1,269.5 $ 1,101.7 Income from operations $ 21.7 $ 45.1 $ 44.9 $ 24.8 Net income $ 11.4 $ 27.7 $ 27.2 $ 14.6 Net income per common share – Basic $ 0.29 $ 0.71 $ 0.70 $ 0.37 Net income per common share – Diluted $ 0.29 $ 0.71 $ 0.69 $ 0.37 2018 First Quarter Second Quarter (b) Third Quarter (c) Fourth Quarter (d) (millions, except per-share amounts) Net sales $ 1,182.8 $ 1,408.1 $ 1,338.5 $ 1,065.8 Income (loss) from operations $ 51.8 $ 74.1 $ 30.5 $ (84.3 ) Net income (loss) $ 37.1 $ 41.8 $ 13.8 $ (72.2 ) Net income (loss) per common share – Basic $ 0.96 $ 1.07 $ 0.36 $ (1.85 ) Net income (loss) per common share – Diluted $ 0.94 $ 1.06 $ 0.35 $ (1.85 ) __________________ (a) Third quarter 2019 results include $1.3 million of pre-tax losses, or $0.03 per share after-tax, from a non-cash pension settlement charge as discussed in Note 12, Retirement and Benefit Plans . (b) Second quarter 2018 results include $12.0 million of pre-tax losses, or $0.23 per share after-tax, from a non-cash pension settlement charge as discussed in Note 12, Retirement and Benefit Plans . (c) Third quarter 2018 results include $11.3 million of pre-tax losses, or $0.21 per share after-tax, from a non-cash pension settlement charge and $11.0 million of pre-tax losses, or $0.21 per share after-tax, from impairment losses on assets held for sale in Northeast Oregon. For additional information, see Note 12, Retirement and Benefit Plans and Note 7, Sale of Manufacturing Facilities . (d) Fourth quarter 2018 results include $57.8 million of pre-tax expenses, or $1.11 per share after-tax, for accelerated depreciation and other curtailment costs related to the permanent curtailment of LVL production at our Roxboro, North Carolina facility as discussed in Note 6, Curtailment of Manufacturing Facilities . Fourth quarter 2018 also includes $24.0 million of pre-tax losses, or $0.46 per share after-tax, from an impairment loss and other sale related costs on our hardwood plywood facility in Moncure, North Carolina upon being classified as held for sale, as discussed in Note 7, Sale of Manufacturing Facilities .

Nature of Operations and Consol

Nature of Operations and Consolidation (Details)	12 Months Ended
	Dec. 31, 2019segment
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of Reportable Segments	2

Summary of Significant Accoun_4

Summary of Significant Accounting Policies:Trade Accounts Receivables and Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Trade Accounts Receivables and Allowance for Doubtful Accounts
Trade receivables, allowances	$ 591	$ 1,062
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Top Ten Customers [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	40.00%
Accounts Receivable [Member] | Credit Concentration Risk [Member] | Customer Two [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	14.00%	13.00%
Accounts Receivable [Member] | Credit Concentration Risk [Member] | Customer One [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	12.00%	11.00%

Summary of Significant Accoun_5

Summary of Significant Accounting Policies:Financial Instruments (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Reported Value Measurement [Member] | 5.625% Senior Notes Due 2024 [Member]
Financial Instruments
Fixed-rate debt	$ 350	$ 350
Level 2 [Member] | Estimate of Fair Value Measurement [Member] | 5.625% Senior Notes Due 2024 [Member]
Financial Instruments
Fixed-rate debt	364.7	328.1
Money Market Funds [Member] | Fair Value, Recurring [Member] | Level 1 [Member]
Financial Instruments
Cash equivalents, fair value	$ 259.5	$ 160.4

Summary of Significant Accoun_6

Summary of Significant Accounting Policies:Vendor Rebates and Allowances (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Accounting Policies [Abstract]
Vendor Rebates and Allowances	$ 9.2	$ 9.7

Summary of Significant Accoun_7

Summary of Significant Accounting Policies:Inventory Valuation (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Inventory, Net [Abstract]
Finished goods and work in process	$ 413,020	$ 441,774
Logs	45,574	54,301
Other raw materials and supplies	39,002	36,974
Inventories	$ 497,596	$ 533,049

Summary of Significant Accoun_8

Summary of Significant Accounting Policies:Property and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 1,107,257		$ 1,064,339
Less accumulated depreciation	(630,308)		(577,115)
Property and equipment, net	476,949	$ 465,492	487,224
Land [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	39,304		38,888
Buildings [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 140,008		164,878	[1]
Buildings [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	20 years
Buildings [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	40 years
Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 61,187		49,509
Improvements [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	10 years
Improvements [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	15 years
Mobile equipment, information technology, and office furniture [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 165,445		150,712
Mobile equipment, information technology, and office furniture [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	3 years
Mobile equipment, information technology, and office furniture [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	7 years
Machinery and equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 666,467		629,337
Machinery and equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	7 years
Machinery and equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	12 years
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 34,846		$ 31,015
[1]	As of December 31, 2018, capital lease assets were included in the "Buildings" asset class. For additional information related to leases, see Note 11, Leases

Summary of Significant Accoun_9

Summary of Significant Accounting Policies:Goodwill Impairment (Details)	12 Months Ended
	Dec. 31, 2019Units
Goodwill and Intangible Assets Disclosure [Abstract]
Number of Reporting Units	2

Summary of Significant Accou_10

Summary of Significant Accounting Policies:Asset Retirement Obligations (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Asset Retirement Obligation Disclosure [Abstract]
Asset Retirement Obligation	$ 2.2	$ 2.1

Summary of Significant Accou_11

Summary of Significant Accounting Policies:Deferred Software Costs (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Capitalized Computer Software [Line Items]
Capitalized Computer Software, Net	$ 4.6	$ 4.6
Capitalized Computer Software, Amortization	$ 2	$ 2	$ 2
Minimum [Member]
Capitalized Computer Software [Line Items]
Capitalized Computer Software Amortization Period	3 years
Maximum [Member]
Capitalized Computer Software [Line Items]
Capitalized Computer Software Amortization Period	5 years

Summary of Significant Accou_12

Summary of Significant Accounting Policies:Labor Concentration and Unions (Details)	12 Months Ended
	Dec. 31, 2019employeeInteger6
Concentration Risk [Line Items]
Entity Number of Employees	6,020
Number of collective bargaining arrangements | Integer6	10
Workforce Subject to Collective Bargaining Arrangements [Member] | Unionized Employees Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	23.00%
Workforce Subject to Collective Bargaining Arrangements Expiring within One Year [Member] | Unionized Employees at the Elgin Plywood Plant, Kettle Falls Plywood Plant and Woodenville BMD Facility [Member]
Concentration Risk [Line Items]
Entity Number of Employees	450
Workforce Subject to Collective Bargaining Arrangements Expiring within One Year [Member] | Unionized Employees at the Billings BMD Facility [Member]
Concentration Risk [Line Items]
Entity Number of Employees	35

Summary of Significant Accou_13

Summary of Significant Accounting Policies:Self-Insurance (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Accounting Policies [Abstract]
Self Insurance Liabilities, Current	$ 9.9	$ 10
Self Insurance Liabilities, Noncurrent	$ 10	$ 9.5

Revenues Revenues_Effect of cha

Revenues Revenues:Effect of change related to ASU 2014-09 (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2018
Balance Sheet [Abstract]
Retained earnings	$ 356,698	$ 330,056
Income Statement [Abstract]
Sales	$ 4,643,404	4,995,290	$ 4,431,991
Accounting Standards Update 2014-09 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
Balance Sheet [Abstract]
Retained earnings				$ 0
Income Statement [Abstract]
Sales		$ 26,500

Revenues Revenue Recognition (D

Revenues Revenue Recognition (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019USD ($)Distribution	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Customer Rebates and Allowances	$ 49.4	$ 52.1
Building Materials Distribution [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Number of Primary Distribution Methods | Distribution	2
Building Materials Distribution [Member] | Shipping and Handling [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Cost of Goods and Services Sold	$ 169.2	$ 156.5	$ 139.4

Income Taxes (Details)

Income Taxes (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)		Dec. 31, 2017USD ($)
Pretax income (loss) from domestic and foreign sources [Abstract]
Domestic	$ 105,341	$ 21,704		$ 115,083
Foreign	2,890	398		2,505
Income before income taxes	108,231	22,102		117,588
Deferred income tax provision (benefit) [Abstract]
Federal	13,700	6,459		22,541
State	4,574	3,126		3,973
Foreign	7	5		0
Total current	18,281	9,590		26,514
Federal	7,430	(5,987)		6,747
State	925	(2,127)		991
Foreign	670	149		379
Total deferred	9,025	(7,965)		8,117
Income tax provision	27,306	1,625		34,631
Income Tax Rate Reconciliation [Abstract]
Income before income taxes	$ 108,231	$ 22,102		$ 117,588
Statutory U.S. income tax rate (as a percent)	21.00%	21.00%		35.00%	[1]
Statutory tax provision	$ 22,728	$ 4,642		$ 41,156
State taxes	4,390	741		3,719
Domestic production activities deduction	0	0		(963)
Unrecognized tax benefits	(178)	(181)		(86)
Tax Cuts and Jobs Act, Income Tax Expense (Benefit)	0	(3,806)	[2]	(8,129)	[2]
Tax credits	(725)	(272)		(912)
Foreign rate differential	71	432		(366)
Share-based compensation	(532)	(1,718)		(413)
Nondeductible executive compensation	852	366		0
Meals and entertainment	738	886		663
Other	(38)	535		(38)
Income tax provision	$ 27,306	$ 1,625		$ 34,631
Effective income tax rate (as a percent)	25.20%	7.40%		29.50%
Tax Cuts and Jobs Act, Income Tax Expense (Benefit) [Abstract]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	21.00%		35.00%	[1]
Tax Cuts and Jobs Act, Income Tax Expense (Benefit)	$ 0	$ (3,806)	[2]	$ (8,129)	[2]
Tax Cuts and Jobs Act of 2017 Accounting Complete [true false]		true
Pension contributions	5,238	$ 26,081		2,193
Income taxes paid (refunds), net	(1,400)	14,500		36,100
Deferred tax assets [Abstract]
Employee benefits	26,914	27,149
Lease Liabilities	23,241	0
Capital Leases	0	5,742
Inventories	3,358	2,649
Foreign net operating loss carryforward	1,514	3,108
Other	6,256	6,461
Net deferred tax assets	61,283	45,109
Deferred tax liabilities [Abstract]
Property and equipment	(50,751)	(48,302)
Right-of-use assets	(21,753)	0
Intangible assets and other	(5,924)	(5,369)
Other	(1,597)	(2,445)
Deferred tax liabilities	(80,025)	(56,116)
Total deferred tax liabilities, net	(18,742)	(11,007)
Reconciliation of unrecognized tax benefits, roll forward
Balance as of January 1	1,850	2,083		2,224
Increases related to prior years' tax positions	0	13		1
Increases related to current year tax positions	53	0		51
Decreases related to prior years' tax positions	0	(43)		(12)
Lapse of statute of limitations	(218)	(203)		(181)
Balance as of December 31	1,685	1,850		2,083
Unrecognized tax benefits that would impact tax rate	1,700	1,800		$ 2,000
State and Local Jurisdiction [Member]
Deferred tax liabilities [Abstract]
State income tax credits, subject to expiration	1,300
CANADA | Subsidiaries [Member]
Deferred tax liabilities [Abstract]
Foreign net operating loss carryforwards, subject to expiration	$ 10,400
Pension Plan, Discretionary Contributions [Member]
Tax Cuts and Jobs Act, Income Tax Expense (Benefit) [Abstract]
Pension contributions		$ 20,000
[1]	On December 22, 2017, the Tax Cuts and Jobs Act (the “Tax Act”), was enacted by the U.S. government. The most significant impact to our financial statements was the reduction of the corporate federal income tax rate from 35% to 21% .
[2]	As of December 31, 2018, we completed our assessment of the effects of the Tax Act on our financial statements. In connection with our analysis of the Tax Act, we recorded discrete tax benefits of $3.8 million and $8.1 million , respectively, during the years ended December 31, 2018 and 2017. The $3.8 million reduction in income tax expense resulted from the remeasurement of deferred income taxes to the new federal statutory rate of 21% , which mostly relates to a $20.0 million discretionary pension contribution made during 2018, for which we received a tax deduction at the 2017 federal income tax rate. The $8.1 million reduction in income tax expense resulted from the remeasurement of deferred income taxes to the new federal statutory rate of 21% .

Net Income Per Common Share (De

Net Income Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	[1]	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	[2]	Sep. 30, 2018	[3]	Jun. 30, 2018	[4]	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Earnings Per Share [Abstract]
Net Income	$ 14,600	$ 27,200		$ 27,700	$ 11,400	$ (72,200)		$ 13,800		$ 41,800		$ 37,100	$ 80,925	$ 20,477	$ 82,957
Computation of basic and diluted net income per common share
Weighted average common shares outstanding during the period (for basic calculation)													39,039	38,932	38,623
Dilutive effect of other potential common shares													203	455	451
Weighted average common shares and potential common shares (for diluted calculation)													39,242	39,387	39,074
Net income per common share - Basic	$ 0.37	$ 0.70		$ 0.71	$ 0.29	$ (1.85)		$ 0.36		$ 1.07		$ 0.96	$ 2.07	$ 0.53	$ 2.15
Net income (loss) per common share – Diluted	$ 0.37	$ 0.69		$ 0.71	$ 0.29	$ (1.85)		$ 0.35		$ 1.06		$ 0.94	$ 2.06	$ 0.52	$ 2.12
Stock Awards [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive stock awards													100	100	0
[1]	Third quarter 2019 results include $1.3 million of pre-tax losses, or $0.03 per share after-tax, from a non-cash pension settlement charge as discussed in Note 12, Retirement and Benefit Plans .
[2]	Fourth quarter 2018 results include $57.8 million of pre-tax expenses, or $1.11 per share after-tax, for accelerated depreciation and other curtailment costs related to the permanent curtailment of LVL production at our Roxboro, North Carolina facility as discussed in Note 6, Curtailment of Manufacturing Facilities . Fourth quarter 2018 also includes $24.0 million of pre-tax losses, or $0.46 per share after-tax, from an impairment loss and other sale related costs on our hardwood plywood facility in Moncure, North Carolina upon being classified as held for sale, as discussed in Note 7, Sale of Manufacturing Facilities .
[3]	Third quarter 2018 results include $11.3 million of pre-tax losses, or $0.21 per share after-tax, from a non-cash pension settlement charge and $11.0 million of pre-tax losses, or $0.21 per share after-tax, from impairment losses on assets held for sale in Northeast Oregon. For additional information, see Note 12, Retirement and Benefit Plans and Note 7, Sale of Manufacturing Facilities .
[4]	Second quarter 2018 results include $12.0 million of pre-tax losses, or $0.23 per share after-tax, from a non-cash pension settlement charge as discussed in Note 12, Retirement and Benefit Plans .

Curtailment of Manufacturing _2

Curtailment of Manufacturing Facilities (Details) - USD ($) $ in Millions	Feb. 20, 2020	Nov. 02, 2018	Mar. 31, 2020	Dec. 31, 2018
Curtailment of LVL Production at Roxboro, NC Facility [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Activities, Initiation Date		Nov. 2, 2018
Restructuring and Related Activities, Completion Date		Dec. 31, 2018
Accelerated depreciation				$ 55
Curtailment of LVL Production at Roxboro, NC Facility [Member] | Loss on sale and curtailment of facilities [Member]
Restructuring Cost and Reserve [Line Items]
CIP and spare parts write-offs				2.6
Severance-related expenses				$ 0.2
Curtailment of I-joist Production at Roxboro, NC Facility [Member] [Member] | Subsequent Event [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Activities, Initiation Date	Feb. 20, 2020
Restructuring and Related Activities, Completion Date	Mar. 31, 2020
Restructuring and Related Cost, Expected Cost	$ 18
Forecast [Member] | Curtailment of I-joist Production at Roxboro, NC Facility [Member] [Member]
Restructuring Cost and Reserve [Line Items]
Accelerated depreciation			$ 18

Sales of Manufacturing Faciliti

Sales of Manufacturing Facilities:Sale of Assets (Details) - USD ($) $ in Thousands	Mar. 01, 2019	Nov. 02, 2018	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of facilities					$ 2,493	$ 15,003	$ 0
Loss (gain) on sale and curtailment of facilities					0	38,314	0
Agreement to Sell Hardwood Facility at Moncure, North Carolina [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Revenue					5,500	32,700	28,200
Disposal Group, Operating Income (Loss)					$ (1,400)	(7,000)	(9,800)
Proceeds from sale of facilities	$ 2,500
Loss (gain) on sale and curtailment of facilities			$ 24,000
Agreement to Sell Hardwood Facility at Moncure, North Carolina [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Loss on sale and curtailment of facilities [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss (gain) on sale and curtailment of facilities			$ 24,000
Agreement With Woodgrain Millwork for Two Lumber Mills and a Particleboard Plant In Northeast Oregon [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Revenue						74,100	82,500
Disposal Group, Operating Income (Loss)						(200)	$ 900
Proceeds from sale of facilities		$ 15,000
Loss (gain) on sale and curtailment of facilities				$ 11,000
Agreement With Woodgrain Millwork for Two Lumber Mills and a Particleboard Plant In Northeast Oregon [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Loss on sale and curtailment of facilities [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss (gain) on sale and curtailment of facilities						$ 11,500

Acquisitions (Details)

Acquisitions (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]
Goodwill	$ 60,382	$ 59,159
BMD Birmingham Acquisition [Member]
Business Acquisition [Line Items]
Purchase price of acquisitions	15,700
Purchase price, post-closing adjustment	100
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]
Accounts receivable	5,563
Inventories	3,395
Other assets	8
Property and equipment	3,487
Lease right-of-use assets	359
Customer relationships	2,100
Goodwill	1,223
Assets acquired	16,135
Accounts payable	100
Lease liabilities	359
Liabilities assumed	459
Net assets acquired	$ 15,676
Nashville, Medford, and Cincinnati BMD facilities [Member]
Business Acquisition [Line Items]
Purchase price of acquisitions		$ 25,500
Customer relationships
Business Acquisition [Line Items]
Customer relationship, useful life	10 years
Customer relationships | BMD Birmingham Acquisition [Member]
Business Acquisition [Line Items]
Customer relationship, useful life	10 years

Goodwill and Intangible Asset_2

Goodwill and Intangible Assets (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)
Goodwill [Abstract]
Balance at December 31, 2018	$ 59,159
Additions	1,223
Balance at December 31, 2019	60,382
Building Materials Distribution [Member]
Goodwill [Abstract]
Balance at December 31, 2018	10,569
Additions	1,223	[1]
Balance at December 31, 2019	11,792
Wood Products [Member]
Goodwill [Abstract]
Balance at December 31, 2018	48,590
Additions	0
Balance at December 31, 2019	$ 48,590
[1]	Represents the acquisition of a wholesale building material distribution location. For additional information, see Note 8, Acquisitions .

Goodwill and Intangible Asset_3

Goodwill and Intangible Assets Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Intangible Amortization Expense, Next Twelve Months	$ 1,200
Intangible Amortization Expense, Year Two	1,200
Intangible Amortization Expense, Year Three	1,200
Intangible Amortization Expense, Year Four	1,200
Intangible Amortization Expense, Year Five	1,200
Customer relationships, Accumulated amortization	(3,553)	$ (2,399)
Intangible assets [Abstract]
Intangible Assets, Gross (Excluding Goodwill)	21,350	19,250
Intangible Assets, Net (Excluding Goodwill)	17,797	16,851
Trade names and trademarks
Indefinite-lived Intangible Assets [Line Items]
Trade names and trademarks, Gross carrying amount	$ 8,900	8,900
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	10 years
Finite-Lived Intangible Assets, Gross	$ 12,450	10,350
Customer relationships, Accumulated amortization	(3,553)	(2,399)
Finite-Lived Intangible Assets, Net	$ 8,897	$ 7,951

Debt_Summary Table (Details)

Debt:Summary Table (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Aug. 29, 2016
Debt Instrument [Line Items]
Deferred financing costs	$ (4,456)	$ (5,572)
Long-term debt	440,544	439,428
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	0	0
Asset Based Credit Facility Term Loan [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	50,000	50,000
Term Loan Due 2026 [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	45,000	45,000
5.625% Senior Notes Due 2024 [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 350,000	$ 350,000	$ 350,000

Debt_Five Year Maturity Table (

Debt:Five Year Maturity Table (Details) $ in Thousands	Dec. 31, 2019USD ($)
Debt Disclosure [Abstract]
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	$ 0
Long-term Debt, Maturities, Repayments of Principal in Year Two	0
Long-term Debt, Maturities, Repayments of Principal in Year Three	50,000
Long-term Debt, Maturities, Repayments of Principal in Year Four	0
Long-term Debt, Maturities, Repayments of Principal in Year Five	350,000
Long-term Debt, Maturities, Repayments of Principal after Year Five	$ 45,000

Debt_Asset-Based Credit Facilit

Debt:Asset-Based Credit Facility (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	May 15, 2015
AssetBasedCreditFacility [Member]
Line of Credit Facility [Line Items]
Fixed charge coverage ratio requirement, if availability falls below 10% of aggregate lending commitments (as a percent)	100.00%
Threshold of availability as a percentage of aggregate lending commitments, below which 1:1 fixed charge coverage ratio must be met	10.00%
Threshold of availability, below which 1:1 fixed charge coverage ratio must be met	$ 37
Current availability	$ 336.7
Dividend restriction, single threshold, percentage of aggregate Revolver Commitments	25.00%
Dividend restriction, combination thresholds, percentage of aggregate Revolver Commitments	15.00%
Dividend restriction, combination thresholds, fixed-charge coverage ratio (as a percent)	100.00%
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity			$ 370
Commitment fee rate (as a percentage)	0.25%
Amount outstanding on Revolving Credit Facility	$ 0	$ 0
Letters of credit outstanding	4.6	$ 4.6
Revolving Credit Facility, Maximum Amount Outstanding During Period	$ 5.5
Revolving Credit Facility, Average Interest Rates During Period	3.69%
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Basis spread on variable interest rate	1.25%
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Basis spread on variable interest rate	1.75%
Revolving Credit Facility [Member] | Base Rate [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Basis spread on variable interest rate	0.25%
Revolving Credit Facility [Member] | Base Rate [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Basis spread on variable interest rate	0.75%
Asset Based Credit Facility Term Loan [Member]
ABL Term Loan
Debt Instrument, Face Amount			$ 50
Debt Instrument, Interest Rate During Period	4.01%
Debt Instrument, Interest Rate During Period With Patronage Credits	3.00%
Asset Based Credit Facility Term Loan [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Basis spread on variable interest rate	1.75%
Asset Based Credit Facility Term Loan [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Basis spread on variable interest rate	2.25%
Asset Based Credit Facility Term Loan [Member] | Base Rate [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Basis spread on variable interest rate	0.75%
Asset Based Credit Facility Term Loan [Member] | Base Rate [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Basis spread on variable interest rate	1.25%

Debt_Term Loan (Details)

Debt:Term Loan (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)Integer9	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)	Mar. 30, 2016USD ($)
Debt Instrument [Line Items]
Repayments of Long-term Debt	$ 5,500	$ 7,500	$ 410,400
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
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	4.14%
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%

Debt_2024 Notes (Details)

Debt:2024 Notes (Details) - 5.625% Senior Notes Due 2024 [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Aug. 29, 2016
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 350
Interest rate		5.625%
Dividend Restriction, Interest Leverage Ratio (as a Percent)	350.00%

Debt_Cash Paid for Interest (De

Debt:Cash Paid for Interest (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Debt Disclosure [Abstract]
Interest Paid	$ 24.1	$ 24.1	$ 23.5

Leases Leases_Topic 842 Adoptio

Leases Leases:Topic 842 Adoption (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease liabilities	$ 67,408	$ 72,400
Retained earnings	356,698		$ 330,056
Property and equipment, net	476,949	465,492	487,224
Operating lease right-of-use assets	64,228	69,155	0
Finance lease right-of-use assets	21,798	20,872	0
Prepaid expenses and other	8,285	31,572	31,818
Accrued liabilities, other	69,772	72,372	63,509
Operating lease liabilities, net of current portion	58,029	63,498	0
Finance lease liabilities, net of current portion	23,419	21,921	0
Other long-term liabilities	12,757	12,671	$ 38,904
Accounting Standards Update 2016-02 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings		0
Property and equipment, net		(21,732)
Operating lease right-of-use assets		69,155
Finance lease right-of-use assets		20,872
Prepaid expenses and other		(246)
Accrued liabilities, other		8,863
Operating lease liabilities, net of current portion		63,498
Finance lease liabilities, net of current portion		21,921
Other long-term liabilities		$ (26,233)
If Accounting Standards Update 2016-02 was Not Adopted [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Property and equipment, net	499,532
Operating lease right-of-use assets	0
Finance lease right-of-use assets	0
Prepaid expenses and other	8,591
Accrued liabilities, other	60,393
Operating lease liabilities, net of current portion	0
Finance lease liabilities, net of current portion	0
Other long-term liabilities	40,447
Impact of Accounting Standards Update 2016-02 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Property and equipment, net	(22,583)
Operating lease right-of-use assets	64,228
Finance lease right-of-use assets	21,798
Prepaid expenses and other	(306)
Accrued liabilities, other	9,379
Operating lease liabilities, net of current portion	58,029
Finance lease liabilities, net of current portion	23,419
Other long-term liabilities	$ (27,690)

Leases Lease_ Terms (Details)

Leases Lease: Terms (Details)	12 Months Ended
	Dec. 31, 2019
Lessee, Lease, Description [Line Items]
Minimum initial term of real estate leases	1 year
Real Estate Leases, Cancellation Notice, Latest Notice	30 days
Real Estate Leases, Cancellation Notice, Earliest Notice	90 days
Minimum [Member]
Lessee, Lease, Description [Line Items]
Operating leases, renewal term	1 year
Maximum [Member]
Lessee, Lease, Description [Line Items]
Operating leases, renewal term	10 years

Leases Leases_ Costs (Details)

Leases Leases: Costs (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)
Lease, Cost [Abstract]
Operating lease cost	$ 13,541
Amortization of right-of-use assets	1,616
Interest on lease liabilities	1,899
Variable lease cost	2,645
Short-term lease cost	4,614
Sublease income	(540)
Total lease cost	$ 23,775

Leases Leases_ Other Informatio

Leases Leases: Other Information (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
Lessee Disclosure [Abstract]
Operating cash flows from operating leases		$ 13,508
Operating cash flows from finance leases		1,862
Financing cash flows from finance leases		783
Right-of-use assets obtained in exchange for lease obligations, operating leases		4,211
Right-of-use assets obtained in exchange for lease obligations, finance leases		$ 2,637
Weighted-average remaining lease term, operating leases		8 years
Weighted-average remaining lease term, finance leases		14 years
Weighted-average discount rate, operating leases	[1]	6.50%
Weighted-average discount rate, finance leases		8.50%
Lessee, Operating Lease, Liability, Payment, Due [Abstract]
2020		$ 13,344
2021		12,211
2022		10,847
2023		10,521
2024		9,920
Thereafter		32,592
Total future minimum lease payments		89,435
Less: interest		(22,027)
Total lease obligations		67,408	$ 72,400
Less: current obligations		(9,379)
Long-term lease obligations		58,029	63,498	$ 0
Finance Lease, Liability, Payment, Due [Abstract]
2020		3,009
2021		3,048
2022		3,043
2023		3,071
2024		3,076
Thereafter		28,889
Total future minimum lease payments		44,136
Less: interest		(19,634)
Total lease obligations		24,502
Less: current obligations		(1,083)
Long-term lease obligations		23,419	$ 21,921	$ 0
Minimum lease payment amount for operating leases signed but not yet commenced		$ 3,900
[1]	Upon adoption of the new lease standard, discount rates used for existing leases were established at January 1, 2019.

Leases Leases_Topic 840 Disclos

Leases Leases:Topic 840 Disclosure (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2019	Jan. 01, 2019
Operating Leases, Rent Expense, Net [Abstract]
Rent Expense	$ 18,200	$ 19,300
Property, Plant and Equipment [Line Items]
Property and equipment, net	487,224		$ 476,949	$ 465,492
Operating lease right-of-use assets	0		$ 64,228	$ 69,155
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2019	13,222
2020	12,734
2021	11,595
2022	10,208
2023	9,800
Thereafter	40,381
Operating Lease Total	97,940
Capital Leases, Future Minimum Payments, Net Minimum Payments, Fiscal Year Maturity [Abstract]
2019	2,578
2020	2,617
2021	2,656
2022	2,694
2023	2,740
Thereafter	30,177
Capital Lease Total	43,462
Less - interest on capital lease obligations	(20,838)
Total principal payable on capital lease obligations	22,624
Less - current obligations	(703)
Property, Plant and Equipment [Member]
Property, Plant and Equipment [Line Items]
Capital Leased Assets, Gross	23,700
Other Noncurrent Liabilities [Member]
Capital Leases, Future Minimum Payments, Net Minimum Payments, Fiscal Year Maturity [Abstract]
Capital Lease Obligations, Noncurrent	21,921
Buildings [Member]
Property, Plant and Equipment [Line Items]
Lease Obligation Incurred	$ 18,900
Buildings [Member] | Capital Lease 1 [Member]
Property, Plant and Equipment [Line Items]
Lessee, Capital Lease, Term of Contract	13 years
Buildings [Member] | Capital Lease 2 [Member]
Property, Plant and Equipment [Line Items]
Lessee, Capital Lease, Term of Contract	20 years

Defined Benefit Plans (Details)

Defined Benefit Plans (Details) $ in Thousands		Sep. 30, 2019USD ($)	Aug. 10, 2018USD ($)	Apr. 25, 2018USD ($)	Dec. 31, 2019USD ($)Integer3Integer4Integer7	Sep. 30, 2019USD ($)	Dec. 31, 2018USD ($)Integer3	Sep. 30, 2018USD ($)	Jun. 30, 2018USD ($)	Aug. 09, 2018	[4]	Apr. 24, 2018USD ($)		Dec. 31, 2018USD ($)		Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)Integer3Integer4Integer5Integer7		Dec. 31, 2018USD ($)		Dec. 31, 2017USD ($)	Dec. 31, 2019USD ($)Integer3Integer4Integer7
Defined Benefit Plan Disclosure [Line Items]
Number of qualified defined benefit pension plan | Integer4					1												1					1
Percentage of defined benefit plan assets transferred out of the plan		10.00%																	60.00%
Change in Benefit Obligation
Benefit obligation at beginning of year												$ 483,525				$ 192,061	$ 176,852		$ 483,525
Service cost																	647		794		$ 1,204
Interest cost																	7,210		11,344		17,542
Actuarial (gain) loss																	29,065		(39,651)
Group annuity transactions	[1]																(19,848)		(265,137)
Benefits Paid																	(1,865)		(14,023)
Benefit obligation at end of year					$ 192,061		$ 176,852							$ 176,852			192,061		176,852		483,525	$ 192,061
Change in plan assets
Fair value of plan assets at beginning of year												$ 422,255				$ 168,651	154,801		422,255
Actual return on plan assets																	29,769		(3,968)
Employer contributions																	5,238		26,081
Group annuity transactions		$ (19,800)	$ (124,800)	$ (151,800)													(19,292)	[1]	(275,544)	[1]
Benefits paid																	(1,865)		(14,023)
Fair value of plan assets at end of year					168,651		154,801							154,801			168,651		154,801		422,255	168,651
Underfunded status					(23,410)		(22,051)							(22,051)			(23,410)		(22,051)			(23,410)
Amounts recognized on our Conolidated Balance Sheets
Current liabilities					(878)		(671)							(671)			(878)		(671)			(878)
Noncurrent liabilities					(22,532)		(21,380)							(21,380)			(22,532)		(21,380)			(22,532)
Net liability					(23,410)		(22,051)							(22,051)			(23,410)		(22,051)			(23,410)
Amounts recognized in accumulated other comprehensive loss
Net actuarial loss					15,332		11,856							11,856			15,332		11,856			15,332
Prior service cost					0		0							0			0		0			0
Net loss recognized					15,332		11,856							11,856			15,332		11,856			15,332
Accumulated benefit obligation					192,100		$ 176,900							$ 176,900			192,100		176,900			192,100
Net Periodic Benefit Cost and Other Amounts Recognized in Other Comprehensive (Income) Loss
Service cost																	647		794		1,204
Interest cost																	7,210		11,344		17,542
Expected return on plan assets																	(5,903)		(11,097)		(18,968)
Amortization of actuarial (gain) loss																	(175)		1,497		1,686
Plan settlement expense						$ 1,300		$ 11,300	$ 12,000								1,342		23,255		0
Net periodic benefit cost																	3,121		25,793		1,464
Changes in plan assets and benefit obligations recognized in other comprehensive (income) loss
Net actuarial (gain) loss																	4,642		(14,178)		(7,067)
Amortization of actuarial gain (loss)	[2]																175		(1,497)		(1,686)
Effects of settlements	[2]																(1,342)		(23,255)		0
Total recognized in other comprehensive (income) loss																	3,475		(38,930)		(8,753)
Total recognized in net periodic cost and other comprehensive (income) loss																	6,596		$ (13,137)		$ (7,289)
Defined Benefit Plans, Estimated Future Net Periodic Benefit Cost For The Next Year					2,000												2,000					2,000
Defined Benefit Plan, Future Amortization of Gain (Loss)					$ (800)												$ (800)					$ (800)
Weighted Average Assumptions Used in Measurement of Benefit Obligation
Discount rate					3.10%		4.15%							4.15%			3.10%		4.15%			3.10%
Rate of compensation increases	[3]				0.00%		0.00%							0.00%			0.00%		0.00%			0.00%
Weighted Average Assumptions Used in Measurement of Net Periodic Benefit Cost
Discount rate										4.05%		3.40%	[4]	3.95%	[4]		4.15%				3.90%
Expected long-term rate of return on plan assets										4.50%		4.75%	[4]	3.85%	[4]		3.85%				5.00%
Rate of compensation increases	[3]																0.00%		0.00%		0.00%
Pension Contributions
Number of real property contributed to the qualified defined benefit pension plan | Integer7					4												4					4
Number of repurchased real property | Integer3					1		1															2
Number of remaining real property contributed to the qualified defined benefit pension plan | Integer3					2												2					2
Contributed properties leaseback transaction lease term																	10 years
Number of extension options for contributed properties | Integer5																	2
Extension terms of contributed properties																	5 years
Annual rent escalation rate for contributed properties																	2.00%
Pension contributions																	$ 5,238		$ 26,081		$ 2,193
Estimated Future Contributions
Estimated 2020 contributions					$ 2,000												2,000					$ 2,000
Expected Future Benefit Payments
2020					3,174												3,174					3,174
2021					3,989												3,989					3,989
2022					5,008												5,008					5,008
2023					5,967												5,967					5,967
2024					6,797												6,797					6,797
Years 2025-2029					43,635												43,635					$ 43,635
Forecast [Member]
Weighted Average Assumptions Used in Measurement of Net Periodic Benefit Cost
Expected long-term rate of return on plan assets																3.50%
Pension Plan, Repurchases [Member]
Pension Contributions
Pension contributions					$ 3,600		$ 4,000										3,600		4,000
Pension Plan [Member]
Pension Contributions
Pension contributions																	5,200		26,100		2,200
Pension Plan, Discretionary Contributions [Member]
Pension Contributions
Pension contributions																			20,000
Pension Plan, Lease Payments [Member]
Pension Contributions
Pension contributions																	$ 1,100		$ 1,500		$ 1,400
[1]	See Defined Benefits Plans above for description of group annuity transactions.
[2]	Represents amounts reclassified from accumulated other comprehensive loss. These amounts are included in the computation of net periodic pension cost. For additional information, see Note 12, Retirement and Benefit Plans .
[3]	Pension benefits for all salaried employees are frozen, resulting in an assumption for the rate of compensation increase of zero . In addition to the salaried benefits being frozen, there are currently no scheduled increases in pension benefit rates applicable to past service covering the minimal number of hourly employees who continue to accrue benefits.
[4]	Prior to the remeasurements of our qualified defined benefit pension plan on April 25, 2018, and August 10, 2018, the discount rates were 3.40% and 4.05% , respectively, and the expected rates of return on plan assets were 4.75% and 4.50% , respectively. The discount rate and expected rate of return on plan assets after the August 10, 2018 remeasurement were 3.95% and 3.85%

Defined Contribution Plans (Det

Defined Contribution Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined Contribution Plan Disclosure [Line Items]
Employer matching contribution, percentage of employees' pay	4.00%
Contributions paid	$ 19.8	$ 22.2	$ 15.9
Minimum [Member]
Defined Contribution Plan Disclosure [Line Items]
Percentage Contributed for Additional Performance Target	1.60%	2.00%	1.00%
Maximum [Member]
Defined Contribution Plan Disclosure [Line Items]
Percentage Contributed for Additional Performance Target	3.10%	4.00%	2.00%

Postretirement Benefit Plans (D

Postretirement Benefit Plans (Details)	5 Months Ended	7 Months Ended	12 Months Ended
	May 31, 2017USD ($)	Dec. 31, 2019USD ($)employee	Dec. 31, 2019USD ($)employee	May 31, 2019USD ($)	Dec. 31, 2018USD ($)employee	May 31, 2018USD ($)	Dec. 31, 2017USD ($)employee
Multiemployer Defined Contributory Trust Plan [Member]
Multiemployer Plans [Line Items]
Number of employees in plan | employee		1,215	1,215		1,221		1,365
Required employer's contribution per hour per active employee			$ 0.90		$ 0.85		$ 0.80
Required defined contributory trust contribution, percent of earnings			4.50%		4.50%		4.50%
Period Contributions			$ 2,600,000		$ 2,800,000		$ 2,800,000
Multiemployer Health and Welfare Plan [Member]
Multiemployer Plans [Line Items]
Number of employees in plan | employee		475	475		604		649
Required employer's contribution per hour per active employee	$ 5.80	$ 6.70		$ 6.40		$ 6.10
Period Contributions			$ 6,700,000		$ 7,700,000		$ 8,100,000

Deferred Compensation Plan (Det

Deferred Compensation Plan (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Deferred Compensation Plans [Line Items]
Imputed interest rate credited to the Deferred Compensation Plan participant's account as a percentage to Moody's Composite Average of Yields on Corporate Bonds	130.00%
Interest expense	$ 26,051	$ 26,193	$ 25,370
Accrued liabilities compensation and benefits [Member]
Deferred Compensation Plans [Line Items]
Deferred compensation liability	2,100	1,100
Other compensation and benefits [Member]
Deferred Compensation Plans [Line Items]
Deferred compensation liability	21,600	18,800
Deferred compensation arrangement with individual [Member]
Deferred Compensation Plans [Line Items]
Interest expense	$ 1,100	$ 1,000	$ 800

Fair Value Measurements of Plan

Fair Value Measurements of Plan Assets (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan fair value of plan assets		$ 168,651	$ 154,801	$ 422,255
Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Period of Notice Required to Redeem Investments		1 day
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Percentage		90.00%
Fixed Income Securities - Russell 14-Year LDI Fixed Income Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Term of Fund		14 years	14 years
Fixed Income Securities - Russell 8-Year LDI Fixed Income Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Term of Fund		8 years
Fixed Income Securities - Russell STRIPS Fixed Income Funds - Ten Years [Member]
Defined Benefit Plan Disclosure [Line Items]
Term of Fund		10 years
Fixed Income Securities - Russell STRIPS Fixed Income Funds - Fifteen Years [Member]
Defined Benefit Plan Disclosure [Line Items]
Term of Fund		15 years
Fixed Income Securities - Russell STRIPS Fixed Income Funds - Twenty-Eight Years [Member]
Defined Benefit Plan Disclosure [Line Items]
Term of Fund		28 years
Multi-Asset Class Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Percentage		10.00%
Multi-Asset Class Fund - Global Equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Percentage		75.00%
Multi-Asset Class Fund - Marketable Real Assets [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Percentage		15.00%
Multi-Asset Class Fund - Global Fixed Income [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Percentage		10.00%
Receivables and Accruals Net [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan fair value of plan assets		$ (240)	$ 440
Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Period of Notice Required to Redeem Investments		1 day
Fair Value, Inputs, Level 1, 2 and 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan fair value of plan assets		$ 168,891	154,361
Fair Value, Inputs, Level 1, 2 and 3 [Member] | Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan fair value of plan assets	[1]	152,530	141,930
Fair Value, Inputs, Level 1, 2 and 3 [Member] | Multi-Asset Class Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan fair value of plan assets	[2]	16,361	12,431
Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan fair value of plan assets		0	0
Level 1 [Member] | Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan fair value of plan assets	[1]	0	0
Level 1 [Member] | Multi-Asset Class Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan fair value of plan assets	[2]	0	0
Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan fair value of plan assets		168,891	154,361
Level 2 [Member] | Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan fair value of plan assets	[1],[3]	152,530	141,930
Level 2 [Member] | Multi-Asset Class Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan fair value of plan assets	[2],[3]	16,361	12,431
Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan fair value of plan assets		0	0
Level 3 [Member] | Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan fair value of plan assets	[1]	0	0
Level 3 [Member] | Multi-Asset Class Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan fair value of plan assets	[2]	$ 0	$ 0
[1]	Invested in the Russell Long Duration Fixed Income Fund at December 31, 2019 and 2018, which is designed to provide current income and capital appreciation through diversified strategies including sector rotation, modest interest rate timing, security selection, and tactical use of high-yield, emerging market bonds and other non-index securities. In addition, at December 31, 2019 and 2018, our investments in this category included the Russell 14 Year LDI Fixed Income Fund. We also were invested in the Russell 8 Year LDI Fixed Income Fund at December 31, 2019. These LDI funds invest primarily in investment grade bonds that closely match those found in discount rate curves used to value U.S. pension liabilities and seeks to provide additional incremental return through modest interest rate timing, security selection, and tactical use of non-credit sectors. In addition, at December 31, 2019 and 2018, our investments in this category included Russell STRIPS Fixed Income Funds with duration profiles of 10 , 15 , and 28 years. These funds invest in a subset of the STRIPS universe with a similar duration profile as their respective Bloomberg Barclays U.S. STRIPS Index.
[2]	Invested in the Russell Multi-Asset Core Plus Fund, which is designed to provide long-term growth by providing a diversified portfolio of investments that has an overall strategic allocation of 75% global equity, 15% marketable real assets, and 10% global fixed income.
[3]	Securities represent common collective trusts managed and valued by Russell Trust Company, the administrator of the funds. While the underlying assets are actively traded on an exchange, the funds are not. The investments in equity and fixed-income securities are considered to have a readily determinable fair value because the fair value per share (unit) is determined and published and is the basis for current transactions. We have the ability to redeem these securities with a 1 day notice.

Long-Term Incentive Compensat_3

Long-Term Incentive Compensation Plans:Stock-Based Compensation (Details) shares in Millions	1 Months Ended
	Feb. 28, 2019stock_awards	Feb. 28, 2018stock_awards	Feb. 28, 2017stock_awards	Dec. 31, 2019shares
Compensation Related Costs [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized				3.7
Number of types of stock-based awards granted (in types) | stock_awards	2	2	2
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant				2.5

Long-Term Incentive Compensat_4

Long-Term Incentive Compensation Plans:PSU and RSU Awards (Details) $ / shares in Units, $ in Thousands		12 Months Ended
		Dec. 31, 2019USD ($)tranch$ / sharesshares	Dec. 31, 2018USD ($)$ / sharesshares	Dec. 31, 2017USD ($)$ / sharesshares
Stock-Based Compensation [Abstract]
Fair market value of PSUs and RSUs vested | $		$ 11,400	$ 15,400	$ 8,500
Share-based Compensation Expense | $		7,973	8,831	9,730
Tax benefit from compensation expense | $		2,000	$ 2,200	$ 2,500
Unrecognized compensation expense | $		$ 7,300
Unrecognized Compensation, Period for Recognition		1 year 8 months 12 days
Officer [Member]
Stock-Based Compensation [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%
Performance Shares Target Percentage Earned, ROIC			100.00%	135.00%
Other employees [Member]
Stock-Based Compensation [Abstract]
Performance Shares that could be awarded, as a percentage of target amount, minimum		0.00%
Performance Shares that could be awarded, as a percentage of target amount, maximum		200.00%
Performance Shares Target Percentage Earned, EBITDA			110.00%	145.00%
Number of equal tranches for annual vesting (in tranches) | tranch		3
Performance Shares [Member]
Stock-Based Compensation [Abstract]
Share-based Compensation Expense | $		$ 3,340	$ 4,005	$ 4,923
Number of shares [Abstract]
Outstanding, December 31, 2018 | shares		429,788
Granted | shares		110,923	78,976	178,021
Performance condition adjustment | shares	[1]	1,443
Vested | shares		(223,840)
Forfeited | shares		(22,967)
Outstanding, December 31, 2019 | shares		295,347	429,788
Weighted Average Grant Date Fair Value [Abstract]
Outstanding, December 31, 2018 | $ / shares		$ 25.90
Granted | $ / shares		29.48	$ 43.05	$ 27.05
Performance condition adjustment | $ / shares	[1]	43.05
Vested | $ / shares		19.97
Forfeited | $ / shares		35.26
Outstanding, December 31, 2019 | $ / shares		$ 31.09	$ 25.90
Performance Shares [Member] | Officer [Member]
Stock-Based Compensation [Abstract]
Vesting period (in years)		3 years
Performance Shares [Member] | Other employees [Member]
Stock-Based Compensation [Abstract]
Number of equal tranches for annual vesting (in tranches) | tranch		3
Restricted Stock Units (RSUs) [Member]
Stock-Based Compensation [Abstract]
Share-based Compensation Expense | $		$ 4,633	$ 4,826	$ 4,807
Number of shares [Abstract]
Outstanding, December 31, 2018 | shares		289,173
Granted | shares		167,861	99,087	214,035
Performance condition adjustment | shares		0
Vested | shares		(183,403)
Forfeited | shares		(16,067)
Outstanding, December 31, 2019 | shares		257,564	289,173
Weighted Average Grant Date Fair Value [Abstract]
Outstanding, December 31, 2018 | $ / shares		$ 29.52
Granted | $ / shares		29.13	$ 43.08	$ 27.10
Performance condition adjustment | $ / shares		0
Vested | $ / shares		26.44
Forfeited | $ / shares		34.65
Outstanding, December 31, 2019 | $ / shares		$ 31.14	$ 29.52
Restricted Stock Units (RSUs) [Member] | Officers and other employees [Member]
Stock-Based Compensation [Abstract]
Number of equal tranches for annual vesting (in tranches) | tranch		3
Restricted Stock Units (RSUs) [Member] | Nonemployee Directors [Member]
Stock-Based Compensation [Abstract]
Vesting period (in years)		1 year
[1]	Represents additional PSUs granted to non-officers based on achievement of 2018 EBITDA in excess of target.

Long-Term Incentive Compensat_5

Long-Term Incentive Compensation Plans:Cash Plan (Details) - Other employees [Member] $ in Millions	12 Months Ended
	Dec. 31, 2019USD ($)tranch	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)
Stock-Based Compensation [Abstract]
Performance cash awards that could be awarded, as a percentage of target amount, minimum	0.00%
Performance cash awards that could be awarded, as a percentage of target amount, maximum	200.00%
Number of equal tranches for annual vesting (in tranches) | tranch	3
Performance Cash Awards Target Percentage Earned		110.00%
General and Administrative Expense [Member]
Stock-Based Compensation [Abstract]
Long-Term Incentive Cash Plan Expense | $	$ 2.2	$ 1.4	$ 0

Stockholders' Equity_Shares and

Stockholders' Equity:Shares and Dividends (Details) - USD ($) $ / shares in Units, $ in Thousands	Feb. 10, 2020	Dec. 31, 2019		Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019		Dec. 31, 2018	Sep. 30, 2018		Jun. 30, 2018	Mar. 31, 2018		Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Common stock, authorized		300,000,000						300,000,000										300,000,000	300,000,000
Common stock, issued		44,352,778						44,075,840										44,352,778	44,075,840
Common stock, outstanding		38,985,705						38,708,767										38,985,705	38,708,767
Dividends paid on common stock, per share		$ 1.10	[1]	$ 0.09	$ 0.09	$ 0.09		$ 0.09	$ 1.07	[1]	$ 0.07	$ 0.07		$ 0.07	$ 0	$ 0	$ 0	$ 1.37	$ 1.30	$ 0.07
Dividends paid on common stock		$ 42,884		$ 3,508	$ 3,509	$ 4,053	[2]	$ 3,502	$ 41,632		$ 2,723	$ 2,758	[2]	$ 2,701	$ 0	$ 0	$ 0	$ 53,954	$ 50,615	$ 2,701
Supplemental dividend per share paid		$ 1							$ 1
Supplemental dividend per share declared		$ 1							1
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Preferred stock, authorized		50,000,000						50,000,000										50,000,000	50,000,000
Preferred stock, shares Issued		0						0										0	0
Subsequent Event [Line Items]
Dividends declared per common share		$ 1.10	[1]	$ 0.09	$ 0.09	$ 0.09		$ 0.09	$ 1.07	[1]	$ 0.07	$ 0.07		$ 0.07	$ 0	$ 0	$ 0	$ 1.37	$ 1.30	$ 0.07
Preferred Stock, Shares Outstanding		0						0										0	0
Subsequent Event [Member]
Subsequent Event [Line Items]
Dividends Payable, Date Declared	Feb. 10, 2020
Dividends declared per common share	$ 0.10
Dividends Payable, Date to be Paid	Mar. 16, 2020
Dividends Payable, Date of Record	Feb. 24, 2020
[1]	During each fourth quarter 2019 and third quarter 2018, our board of directors declared and paid a supplemental dividend of $1.00 per share of our common stock.
[2]	Includes payments of dividend equivalents on RSUs and PSUs which vested in first quarter of each year.

Stockholders' Equity_Stock Repu

Stockholders' Equity:Stock Repurchase (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Feb. 25, 2015
Equity, Class of Treasury Stock [Line Items]
Treasury Stock, Value, Acquired, Cost Method		$ 4,930
ShareRepurchaseProgram2015 [Member]
Equity, Class of Treasury Stock [Line Items]
Stock Repurchase Program, Number of Shares Authorized to be Repurchased				2,000,000
Treasury stock, shares acquired	0	200,000	0
Treasury Stock, Value, Acquired, Cost Method		$ 4,900
Treasury Stock Acquired, Average Cost Per Share		$ 24.65
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased	496,989

Stockholders' Equity_AOCI (Deta

Stockholders' Equity:AOCI (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance, net of taxes		$ 672,590	$ 674,549	$ 580,004
Net actuarial gain (loss), before taxes		(4,642)	14,178	7,067
Amortization of actuarial (gain) loss, before taxes	[1]	(175)	1,497	1,686
Effect of settlements, before taxes	[1]	1,342	23,255	0
Income taxes		879	(9,880)	(2,443)
Ending Balance, net of taxes		701,330	672,590	674,549
Accumulated Other Comprehensive Loss [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance, net of taxes		(47,652)	(76,702)	(83,012)
Ending Balance, net of taxes		$ (50,248)	$ (47,652)	$ (76,702)
[1]	Represents amounts reclassified from accumulated other comprehensive loss. These amounts are included in the computation of net periodic pension cost. For additional information, see Note 12, Retirement and Benefit Plans .

Transactions With Related Par_2

Transactions With Related Party (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Unconsolidated variable interest entity [Member]
Related Party Transaction [Line Items]
Revenue from related parties	$ 16.5	$ 16.7	$ 16.6
Cost of sales from related party	$ 81.7	$ 83.1	$ 86.4
LouisianaTimberProcurementCompanyLLC [Member] | Unconsolidated variable interest entity [Member]
Related Party Transaction [Line Items]
Variable interest entity, ownership percentage	50.00%
LouisianaTimberProcurementCompanyLLC [Member] | Packaging Corporation of America (PCA) [Member] | Variable interest entity, primary beneficiary [Member]
Related Party Transaction [Line Items]
Variable interest entity, ownership percentage	50.00%

Financial Instruments Risk (Det

Financial Instruments Risk (Details) - USD ($) $ in Thousands	1 Months Ended
	Nov. 30, 2018	Dec. 31, 2019	Dec. 31, 2018	Mar. 31, 2016	Feb. 16, 2016
Interest Rate Derivatives [Abstract]
Long-term debt		$ 440,544	$ 439,428
Term Loans Due 2022 and 2026 [Member]
Interest Rate Derivatives [Abstract]
Long-term debt		95,000
Term Loan Due 2026 [Member]
Interest Rate Derivatives [Abstract]
Liquidation of Derivative Notional Amount	$ 30,000
Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member] | Level 2 [Member] | Other Non-Current Assets [Member]
Interest Rate Derivatives [Abstract]
Fair value of interest rate swap agreements, Asset		800	3,800
Interest Rate Swap - $50 million notional amount fixed at 1.007% [Member] | Not Designated as Hedging Instrument [Member]
Interest Rate Derivatives [Abstract]
Derivative, Notional Amount					$ 50,000
Interest rate swaps, fixed interest rate					1.007%
Interest Rate Swap - $75 million notional amount fixed at 1.256% [Member] | Not Designated as Hedging Instrument [Member]
Interest Rate Derivatives [Abstract]
Derivative, Notional Amount				$ 75,000
Interest Rate Swap - $45 million notional amount fixed at 1.256% [Member] | Not Designated as Hedging Instrument [Member]
Interest Rate Derivatives [Abstract]
Derivative, Notional Amount				$ 45,000
Interest rate swaps, fixed interest rate				1.256%
Interest rate swap – $50 and $45 Million Notional Amount fixed at 1.007% and 1.256% [Member] | Not Designated as Hedging Instrument [Member]
Interest Rate Derivatives [Abstract]
Derivative, Notional Amount		$ 95,000	$ 95,000

Segment Sales to External Custo

Segment Sales to External Customers by Product Line (Details) $ in Thousands		12 Months Ended
		Dec. 31, 2019USD ($)segment	Dec. 31, 2018USD ($)		Dec. 31, 2017USD ($)
Segment Reporting [Abstract]
Number of Reportable Segments | segment		2
Sales to external customers [Line Items]
Sales		$ 4,643,404	$ 4,995,290		$ 4,431,991
Wood Products and Building Materials Distribution [Member]
Sales to external customers [Line Items]
Sales		4,643,400	4,995,300		4,432,000
Wood Products [Member]
Sales to external customers [Line Items]
Sales	[1]	$ 505,700	707,700		658,300
Intersegment EWP Sales Volumes As Percentage to Total EWP Sales Volumes		77.00%
Wood Products [Member] | Laminated Veneer Lumber [Member]
Sales to external customers [Line Items]
Sales	[1]	$ 39,500	42,200		45,500
Wood Products [Member] | I-joists [Member]
Sales to external customers [Line Items]
Sales	[1]	22,100	29,300		35,200
Wood Products [Member] | Other Engineered Wood Products [Member]
Sales to external customers [Line Items]
Sales	[1]	26,800	25,300		22,000
Wood Products [Member] | Plywood and veneer [Member]
Sales to external customers [Line Items]
Sales	[1]	255,100	336,200		324,400
Wood Products [Member] | Lumber [Member]
Sales to external customers [Line Items]
Sales	[1]	52,500	86,000	[2]	87,600
Wood Products [Member] | Byproducts [Member]
Sales to external customers [Line Items]
Sales	[1]	75,100	87,300		53,200	[3]
Wood Products [Member] | Particleboard [Member]
Sales to external customers [Line Items]
Sales	[1]	0	37,500	[2]	46,000
Wood Products [Member] | Other [Member]
Sales to external customers [Line Items]
Sales	[1]	34,700	63,900		44,400
Building Materials Distribution [Member]
Sales to external customers [Line Items]
Sales		4,137,700	4,287,600		3,773,700
Building Materials Distribution [Member] | Commodity [Member]
Sales to external customers [Line Items]
Sales		1,725,400	2,070,100		1,808,200
Building Materials Distribution [Member] | General line [Member]
Sales to external customers [Line Items]
Sales		1,580,700	1,421,500		1,269,500
Building Materials Distribution [Member] | Engineered wood products [Member]
Sales to external customers [Line Items]
Sales		831,600	796,000		696,000
Non-US [Member]
Sales to external customers [Line Items]
Sales		$ 76,000	$ 96,000		$ 94,000
[1]	Amounts represent sales to external customers. Sales are calculated after intersegment sales eliminations to our Building Materials Distribution segment, as well as the cost of EWP rebates and sales allowances provided at various stages of the supply chain (including distributors, retail lumberyards, and professional builders). For the year ended December 31, 2019 , approximately 77% of Wood Products' EWP sales volumes were to our Building Materials Distribution segment.
[2]	In fourth quarter 2018, we sold two lumber mills and our particleboard plant located in Northeast Oregon. For additional information, see Note 7, Sale of Manufacturing Facilities .
[3]	As discussed in Note 3, Revenues, upon adoption of ASC Topic 606, Revenue from Contracts with Customers , under the modified retrospective method on January 1, 2018, amounts recorded in 2017 have not been adjusted.

Segment Information (Details)

Segment Information (Details) - USD ($) $ in Thousands		3 Months Ended												12 Months Ended
		Dec. 31, 2019	Sep. 30, 2019	[1]	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018		Sep. 30, 2018	[3]	Jun. 30, 2018	[4]	Mar. 31, 2018	Dec. 31, 2019		Dec. 31, 2018		Dec. 31, 2017
Segment Reporting Information
Sales														$ 4,643,404		$ 4,995,290		$ 4,431,991
Income (loss) from operations		$ 24,800	$ 44,900		$ 45,100	$ 21,700	$ (84,300)	[2]	$ 30,500		$ 74,100		$ 51,800	136,459		72,038		141,413
Depreciation and amortization														80,141		146,837		80,379
Capital expenditures														98,396		105,469		75,450
Loss (gain) on sale and curtailment of facilities														0		38,314		0
Payments to Acquire Businesses, Net of Cash Acquired														15,676		25,482		0
Assets		1,693,351					1,581,248							1,693,351		1,581,248
BMD Birmingham Acquisition [Member]
Segment Reporting Information
Payments to Acquire Businesses, Net of Cash Acquired														15,700
Nashville, Medford, and Cincinnati BMD facilities [Member]
Segment Reporting Information
Payments to Acquire Businesses, Net of Cash Acquired																25,500
Curtailment of LVL Production at Roxboro, NC Facility [Member]
Segment Reporting Information
Accelerated depreciation							55,000
Operating Segments [Member]
Segment Reporting Information
Income (loss) from operations														170,433		102,488		170,389
Intersegment eliminations and other [Member]
Segment Reporting Information
Sales	[5]													(769,482)		(825,682)		(715,579)
Corporate, Non-Segment [Member]
Segment Reporting Information
Income (loss) from operations														(33,974)		(30,450)		(28,976)
Depreciation and amortization														1,701		1,568		1,760
Capital expenditures														4,214		771		1,549
Assets		289,781					191,587							289,781		191,587
Wood Products [Member]
Segment Reporting Information
Sales	[6]													505,700		707,700		658,300
Depreciation and amortization														57,671		126,989	[7]	63,115
Capital expenditures														$ 53,460		$ 53,392		$ 54,600
Intersegment Sales As Percentage to Total Sales														60.00%		54.00%		52.00%
Assets		635,475					690,400							$ 635,475		$ 690,400
Wood Products [Member] | Curtailment of LVL Production at Roxboro, NC Facility [Member]
Segment Reporting Information
Accelerated depreciation and other costs							57,800									57,800
Accelerated depreciation																55,000
Wood Products [Member] | Loss on sale and curtailment of facilities [Member]
Segment Reporting Information
Loss (gain) on sale and curtailment of facilities																35,500
Wood Products [Member] | Operating Segments [Member]
Segment Reporting Information
Sales														1,275,167		1,533,270		$ 1,373,760
Income (loss) from operations														54,197		(10,022)	[8]	53,629
Building Materials Distribution [Member]
Segment Reporting Information
Sales														4,137,700		4,287,600		3,773,700
Depreciation and amortization														20,769		18,280		15,504
Capital expenditures														40,722	[9]	51,306	[9]	19,301
Assets		$ 768,095					$ 699,261							768,095		699,261
Building Materials Distribution [Member] | Operating Segments [Member]
Segment Reporting Information
Sales														4,137,719		4,287,702		3,773,810
Income (loss) from operations														$ 116,236		$ 112,510		$ 116,760
[1]	Third quarter 2019 results include $1.3 million of pre-tax losses, or $0.03 per share after-tax, from a non-cash pension settlement charge as discussed in Note 12, Retirement and Benefit Plans .
[2]	Fourth quarter 2018 results include $57.8 million of pre-tax expenses, or $1.11 per share after-tax, for accelerated depreciation and other curtailment costs related to the permanent curtailment of LVL production at our Roxboro, North Carolina facility as discussed in Note 6, Curtailment of Manufacturing Facilities . Fourth quarter 2018 also includes $24.0 million of pre-tax losses, or $0.46 per share after-tax, from an impairment loss and other sale related costs on our hardwood plywood facility in Moncure, North Carolina upon being classified as held for sale, as discussed in Note 7, Sale of Manufacturing Facilities .
[3]	Third quarter 2018 results include $11.3 million of pre-tax losses, or $0.21 per share after-tax, from a non-cash pension settlement charge and $11.0 million of pre-tax losses, or $0.21 per share after-tax, from impairment losses on assets held for sale in Northeast Oregon. For additional information, see Note 12, Retirement and Benefit Plans and Note 7, Sale of Manufacturing Facilities .
[4]	Second quarter 2018 results include $12.0 million of pre-tax losses, or $0.23 per share after-tax, from a non-cash pension settlement charge as discussed in Note 12, Retirement and Benefit Plans .
[5]	Primarily represents intersegment sales from our Wood Products segment to our Building Materials Distribution segment. During 2019 , 2018 , and 2017 , approximately 60% , 54% , and 52% , respectively, of Wood Products' overall sales were to our Building Materials Distribution segment.
[6]	Amounts represent sales to external customers. Sales are calculated after intersegment sales eliminations to our Building Materials Distribution segment, as well as the cost of EWP rebates and sales allowances provided at various stages of the supply chain (including distributors, retail lumberyards, and professional builders). For the year ended December 31, 2019 , approximately 77% of Wood Products' EWP sales volumes were to our Building Materials Distribution segment.
[7]	Depreciation and amortization for Wood Products includes $55.0 million of accelerated depreciation to fully depreciate the curtailed LVL production assets at our Roxboro, North Carolina facility during fourth quarter 2018. For more information, see Note 6, Curtailment of Manufacturing Facilities .
[8]	Wood Products segment operating loss for the year ended December 31, 2018, includes pre-tax facility impairment and sales related losses of $35.5 million , as well as $57.8 million of accelerated depreciation and other curtailment costs related to the permanent curtailment of LVL production at our Roxboro, North Carolina facility. For more information, see Note 6, Curtailment of Manufacturing Facilities and Note 7, Sale of Manufacturing Facilities .
[9]	Capital spending in 2019 and 2018 for Building Materials Distribution includes $15.7 million and $25.5 million , respectively, for the acquisition of wholesale building material distribution locations. For more information, see Note 8, Acquisitions .

Commitments, Legal Proceeding_2

Commitments, Legal Proceedings and Contingencies, and Guarantees:Commitments (Details) $ in Millions	Dec. 31, 2019USD ($)
Inventories [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
Unrecorded Unconditional Purchase Obligation	$ 170

Commitments, Legal Proceeding_3

Commitments, Legal Proceedings and Contingencies, and Guarantees:Guarantees (Details) - 5.625% Senior Notes Due 2024 [Member] - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Aug. 29, 2016
Guarantor Obligations [Line Items]
Interest rate			5.625%
Long-term Debt, Gross	$ 350,000	$ 350,000	$ 350,000

Quarterly Results of Operatio_3

Quarterly Results of Operations (unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019		Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018		Sep. 30, 2018		Jun. 30, 2018		Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net sales	$ 1,101,700	$ 1,269,500	[1]	$ 1,230,100	$ 1,042,100	$ 1,065,800	[2]	$ 1,338,500	[3]	$ 1,408,100	[4]	$ 1,182,800
Income (loss) from operations	24,800	44,900	[1]	45,100	21,700	(84,300)	[2]	30,500	[3]	74,100	[4]	51,800	$ 136,459	$ 72,038	$ 141,413
Net income (loss)	$ 14,600	$ 27,200	[1]	$ 27,700	$ 11,400	$ (72,200)	[2]	$ 13,800	[3]	$ 41,800	[4]	$ 37,100	$ 80,925	$ 20,477	$ 82,957
Net income (loss) per common share – Basic	$ 0.37	$ 0.70	[1]	$ 0.71	$ 0.29	$ (1.85)	[2]	$ 0.36	[3]	$ 1.07	[4]	$ 0.96	$ 2.07	$ 0.53	$ 2.15
Net income (loss) per common share – Diluted	$ 0.37	0.69	[1]	$ 0.71	$ 0.29	(1.85)	[2]	0.35	[3]	1.06	[4]	$ 0.94	$ 2.06	$ 0.52	$ 2.12
Plan settlement expense													$ 1,300	$ 23,300
Loss (gain) on sale and curtailment of facilities													$ 0	38,314	$ 0
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Agreement With Woodgrain Millwork for Two Lumber Mills and a Particleboard Plant In Northeast Oregon [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net income (loss) per common share – Diluted								$ (0.21)
Loss (gain) on sale and curtailment of facilities								$ 11,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Agreement to Sell Hardwood Facility at Moncure, North Carolina [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net income (loss) per common share – Diluted						$ (0.46)
Loss (gain) on sale and curtailment of facilities						$ 24,000
Wood Products [Member] | Curtailment of LVL Production at Roxboro, NC Facility [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net income (loss) per common share – Diluted						$ (1.11)
Accelerated depreciation and other costs						$ 57,800								$ 57,800
Pension Plan [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net income (loss) per common share – Diluted		$ (0.03)						$ (0.21)		$ (0.23)
Plan settlement expense		$ 1,300						$ 11,300		$ 12,000
[1]	Third quarter 2019 results include $1.3 million of pre-tax losses, or $0.03 per share after-tax, from a non-cash pension settlement charge as discussed in Note 12, Retirement and Benefit Plans .
[2]	Fourth quarter 2018 results include $57.8 million of pre-tax expenses, or $1.11 per share after-tax, for accelerated depreciation and other curtailment costs related to the permanent curtailment of LVL production at our Roxboro, North Carolina facility as discussed in Note 6, Curtailment of Manufacturing Facilities . Fourth quarter 2018 also includes $24.0 million of pre-tax losses, or $0.46 per share after-tax, from an impairment loss and other sale related costs on our hardwood plywood facility in Moncure, North Carolina upon being classified as held for sale, as discussed in Note 7, Sale of Manufacturing Facilities .
[3]	Third quarter 2018 results include $11.3 million of pre-tax losses, or $0.21 per share after-tax, from a non-cash pension settlement charge and $11.0 million of pre-tax losses, or $0.21 per share after-tax, from impairment losses on assets held for sale in Northeast Oregon. For additional information, see Note 12, Retirement and Benefit Plans and Note 7, Sale of Manufacturing Facilities .
[4]	Second quarter 2018 results include $12.0 million of pre-tax losses, or $0.23 per share after-tax, from a non-cash pension settlement charge as discussed in Note 12, Retirement and Benefit Plans .