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Segment Information Segment Sales to External Customers by Product Line (Details) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 USD ($) segment | Mar. 31, 2017 USD ($)
Segment Reporting [Abstract] |  |  |  |
Number of Reportable Segments | segment |  | 2 |  |
Revenue from External Customer [Line Items] |  |  |  |
Sales |  | $ 1,182,841 | $ 974,443 |
Wood Products and Building Materials Distribution [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Sales |  | 1,182,800 | 974,400 |
Wood Products [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Sales |  | $ 190,500 | 158,800 |
Intersegment EWP Sales Volumes As Percentage to Total EWP Sales Volumes |  | 71.00% |  |
Wood Products [Member] | Laminated Veneer Lumber [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Sales | [1] | $ 13,500 | 16,000 |
Wood Products [Member] | I-joists [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Sales | [1] | 9,900 | 11,100 |
Wood Products [Member] | Other Engineered Wood Products [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Sales | [1] | 6,600 | 5,000 |
Wood Products [Member] | Plywood and veneer [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Sales |  | 87,100 | 72,400 |
Wood Products [Member] | Lumber [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Sales |  | 24,900 | 21,000 |
Wood Products [Member] | Byproducts [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Sales |  | 22,100 | 13,900 | [2]
Wood Products [Member] | Particleboard [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Sales |  | 10,800 | 10,800 |
Wood Products [Member] | Other - Wood Products [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Sales |  | 15,500 | 8,600 |
Building Materials Distribution [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Sales |  | 992,400 | 815,700 |
Building Materials Distribution [Member] | Commodity product line [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Sales |  | 490,600 | 379,000 |
Building Materials Distribution [Member] | General line [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Sales |  | 315,200 | 275,800 |
Building Materials Distribution [Member] | Engineered wood products [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Sales |  | $ 186,600 | $ 160,900 |
[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). Approximately 71% 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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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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