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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.