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Segment Sales to External Customers by Product Line (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 USD ($) | [1] | Sep. 30, 2020 USD ($) | [2] | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | [3] | Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2020 USD ($) segment | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Segment Reporting [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Reportable Segments | segment |  |  |  |  |  |  |  |  |  | 2 |  |  |
Sales to external customers [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Sales |  | $ 1,472,200 | $ 1,589,300 | $ 1,242,800 | $ 1,170,500 | $ 1,101,700 | $ 1,269,500 | $ 1,230,100 | $ 1,042,100 | $ 5,474,838 | $ 4,643,404 | $ 4,995,290 |
Wood Products and Building Materials Distribution [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Sales to external customers [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  |  | 5,474,800 | 4,643,400 | 4,995,300 |
Wood Products [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Sales to external customers [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Sales | [4] |  |  |  |  |  |  |  |  | $ 522,800 | $ 505,700 | $ 707,700 |
Intersegment EWP Sales Volumes As Percentage to Total EWP Sales Volumes |  |  |  |  |  |  |  |  |  | 80.00% | 77.00% | 74.00% |
Building Materials Distribution [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Sales to external customers [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  |  | $ 4,952,000 | $ 4,137,700 | $ 4,287,600 |
Laminated Veneer Lumber [Member] | Wood Products [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Sales to external customers [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Sales | [4] |  |  |  |  |  |  |  |  | 18,400 | 39,500 | 42,200 |
I-joists [Member] | Wood Products [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Sales to external customers [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Sales | [4] |  |  |  |  |  |  |  |  | 7,300 | 22,100 | 29,300 |
Other Engineered Wood Products [Member] | Wood Products [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Sales to external customers [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Sales | [4] |  |  |  |  |  |  |  |  | 23,900 | 26,800 | 25,300 |
Plywood and veneer [Member] | Wood Products [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Sales to external customers [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Sales | [4] |  |  |  |  |  |  |  |  | 332,700 | 255,100 | 336,200 |
Lumber [Member] | Wood Products [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Sales to external customers [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Sales | [4] |  |  |  |  |  |  |  |  | 54,700 | 52,500 | 86,000 | [5]
Byproducts [Member] | Wood Products [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Sales to external customers [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Sales | [4] |  |  |  |  |  |  |  |  | 68,600 | 75,100 | 87,300 |
Particleboard [Member] | Wood Products [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Sales to external customers [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Sales | [4] |  |  |  |  |  |  |  |  | 0 | 0 | 37,500 | [5]
Other [Member] | Wood Products [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Sales to external customers [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Sales | [4] |  |  |  |  |  |  |  |  | 17,100 | 34,700 | 63,900 |
Commodity [Member] | Building Materials Distribution [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Sales to external customers [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  |  | 2,309,900 | 1,725,400 | 2,070,100 |
General line [Member] | Building Materials Distribution [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Sales to external customers [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  |  | 1,762,300 | 1,580,700 | 1,421,500 |
Engineered wood products [Member] | Building Materials Distribution [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Sales to external customers [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  |  | 879,900 | 831,600 | 796,000 |
Non-US [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Sales to external customers [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  |  | $ 71,000 | $ 76,000 | $ 96,000 |
Customer One [Member] | Revenue Benchmark [Member] | Customer Concentration Risk [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Sales to external customers [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  |  |  |  |  |  |  | 11.00% |  |  |
[1] | Fourth quarter 2020 results include $6.2 million of pre-tax losses, or $0.12 per share after-tax, from a non-cash pension settlement charge related to the Plan Termination, as discussed in Note 12, Retirement and Benefit Plans. Fourth quarter 2020 results also include $38.8 million, or $0.98 per share, of incremental income tax expense related to the release of stranded tax effects upon Plan Termination, as discussed in Note 4, Income Taxes.
[2] | Third quarter 2020 results include $14.0 million of pre-tax losses on extinguishment of debt, or $0.27 per share after-tax, as we refinanced our senior notes at a lower interest rate with an extended maturity, as discussed in Note 10, Debt.
[3] | First quarter 2020 results include $15.0 million and $1.7 million, respectively, of pre-tax accelerated depreciation and other curtailment related costs, or $0.32 per share after-tax, related to the permanent curtailment of I-joist production at our Roxboro, North Carolina facility, as discussed in Note 6, Curtailment of Manufacturing Facilities.
[4] | 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 homebuilders). For the years ended December 31, 2020, 2019, and 2018, approximately 80%, 77%, and 74%, respectively, of Wood Products' EWP sales volumes were to our Building Materials Distribution segment.
[5] | 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.

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