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Segment Information Segment Sales to External Customers by Product Line (Details) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) segment | Sep. 30, 2017 USD ($)
Segment Reporting [Abstract] |  |  |  |  |
Number of Reportable Segments | segment |  |  |  | 2 |
Revenue from External Customer [Line Items] |  |  |  |  |
Sales |  | $ 1,338,512 | $ 1,226,644 | $ 3,929,485 | $ 3,340,026
Wood Products and Building Materials Distribution [Member] |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |
Sales |  | 1,338,500 | 1,226,600 | 3,929,500 | 3,340,000
Wood Products [Member] |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |
Sales |  | 179,200 | 181,000 | $ 564,100 | 498,100
Intersegment EWP Sales Volumes As Percentage to Total EWP Sales Volumes |  |  |  | 73.00% |
Wood Products [Member] | Laminated Veneer Lumber [Member] |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |
Sales | [1] | 9,200 | 10,900 | $ 32,500 | 36,200
Wood Products [Member] | I-joists [Member] |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |
Sales | [1] | 8,500 | 7,900 | 26,300 | 26,700
Wood Products [Member] | Other Engineered Wood Products [Member] |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |
Sales | [1] | 7,300 | 6,100 | 19,600 | 16,500
Wood Products [Member] | Plywood and veneer [Member] |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |
Sales | [1] | 82,800 | 92,400 | 266,500 | 244,000
Wood Products [Member] | Lumber [Member] |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |
Sales | [1] | 20,300 | 22,900 | 70,200 | 66,400
Wood Products [Member] | Byproducts [Member] |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |
Sales | [1],[2] | 23,800 | 13,700 | 68,700 | 41,000
Wood Products [Member] | Particleboard [Member] |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |
Sales | [1] | 10,600 | 12,200 | 33,300 | 34,700
Wood Products [Member] | Other - Wood Products [Member] |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |
Sales | [1] | 16,700 | 14,900 | 46,900 | 32,600
Building Materials Distribution [Member] |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |
Sales |  | 1,159,300 | 1,045,600 | 3,365,400 | 2,842,000
Building Materials Distribution [Member] | Commodity product line [Member] |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |
Sales |  | 554,800 | 505,600 | 1,648,000 | 1,338,400
Building Materials Distribution [Member] | General line [Member] |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |
Sales |  | 385,800 | 354,400 | 1,093,900 | 971,700
Building Materials Distribution [Member] | Engineered wood products [Member] |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |
Sales |  | $ 218,600 | $ 185,700 | $ 623,400 | $ 531,800
[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 nine months ended September 30, 2018, approximately 73% of Wood Products' EWP sales volumes were to our Building Materials Distribution segment.
[2] | As discussed in Note 3, Revenues, prior period amounts have not been adjusted under the modified retrospective method upon adoption of ASC Topic 606, Revenue from Contracts with Customers.

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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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