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Segment Information Segment Sales to External Customers by Product Line (Details) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) segment | Jun. 30, 2019 USD ($)
Segment Reporting [Abstract] |  |  |  |  |
Number of Reportable Segments | segment |  |  |  | 2 |
Revenue from External Customer [Line Items] |  |  |  |  |
Sales |  | $ 1,242,760 | $ 1,230,081 | $ 2,413,294 | $ 2,272,167
Wood Products and Building Materials Distribution [Member] |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |
Sales |  | 1,242,800 | 1,230,100 | 2,413,300 | 2,272,200
Wood Products [Member] |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |
Sales |  | 108,500 | 132,700 | $ 229,000 | 267,100
Intersegment EWP Sales Volumes As Percentage to Total EWP Sales Volumes |  |  |  | 80.00% |
Wood Products [Member] | Laminated Veneer Lumber [Member] |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |
Sales | [1] | 5,300 | 12,000 | $ 11,300 | 23,900
Wood Products [Member] | I-joists [Member] |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |
Sales | [1] | 2,600 | 8,000 | 7,100 | 13,300
Wood Products [Member] | Other engineered wood products [Member] |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |
Sales | [1] | 5,200 | 8,600 | 11,600 | 14,300
Wood Products [Member] | Plywood and veneer [Member] |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |
Sales | [1] | 65,200 | 63,500 | 129,000 | 130,900
Wood Products [Member] | Lumber [Member] |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |
Sales | [1] | 12,300 | 14,000 | 24,600 | 27,200
Wood Products [Member] | Byproducts [Member] |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |
Sales | [1] | 15,700 | 18,000 | 36,400 | 38,000
Wood Products [Member] | Other [Member] |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |
Sales | [1] | 2,200 | 8,600 | 9,000 | 19,400
Building Materials Distribution [Member] |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |
Sales |  | 1,134,300 | 1,097,400 | 2,184,300 | 2,005,100
Building Materials Distribution [Member] | Commodity product line [Member] |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |
Sales |  | 490,000 | 450,700 | 930,100 | 849,000
Building Materials Distribution [Member] | General line [Member] |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |
Sales |  | 448,100 | 429,600 | 845,600 | 753,100
Building Materials Distribution [Member] | Engineered wood products [Member] |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |
Sales |  | $ 196,200 | $ 217,200 | $ 408,600 | $ 403,000
[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 six months ended June 30, 2020, approximately 80% of Wood Products' EWP sales volumes were to our Building Materials Distribution segment.

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- Definition Intersegment Engineered Wood Products (EWP) Sales Volumes As Percentage to Total EWP Sales Volumes + References No definition available. + Details
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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 + Details
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