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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, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
segment
Jun. 30, 2017
USD ($)
Segment Reporting [Abstract]        
Number of Reportable Segments | segment     2  
Revenue from External Customer [Line Items]        
Sales $ 1,408,132 $ 1,138,939 $ 2,590,973 $ 2,113,382
Wood Products and Building Materials Distribution [Member]        
Revenue from External Customer [Line Items]        
Sales 1,408,100 1,138,900 2,591,000 2,113,400
Wood Products [Member]        
Revenue from External Customer [Line Items]        
Sales 194,300 158,200 $ 384,800 317,000
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] 9,800 9,300 $ 23,200 25,300
Wood Products [Member] | I-joists [Member]        
Revenue from External Customer [Line Items]        
Sales [1] 7,900 7,600 17,800 18,700
Wood Products [Member] | Other Engineered Wood Products [Member]        
Revenue from External Customer [Line Items]        
Sales [1] 5,800 5,400 12,300 10,400
Wood Products [Member] | Plywood and veneer [Member]        
Revenue from External Customer [Line Items]        
Sales 96,700 79,200 183,700 151,600
Wood Products [Member] | Lumber [Member]        
Revenue from External Customer [Line Items]        
Sales 25,000 22,500 49,900 43,500
Wood Products [Member] | Byproducts [Member]        
Revenue from External Customer [Line Items]        
Sales [2] 22,800 13,400 44,900 27,300
Wood Products [Member] | Particleboard [Member]        
Revenue from External Customer [Line Items]        
Sales 11,800 11,700 22,600 22,500
Wood Products [Member] | Other - Wood Products [Member]        
Revenue from External Customer [Line Items]        
Sales 14,700 9,100 30,200 17,700
Building Materials Distribution [Member]        
Revenue from External Customer [Line Items]        
Sales 1,213,800 980,700 2,206,100 1,796,400
Building Materials Distribution [Member] | Commodity product line [Member]        
Revenue from External Customer [Line Items]        
Sales 602,700 453,800 1,093,200 832,800
Building Materials Distribution [Member] | General line [Member]        
Revenue from External Customer [Line Items]        
Sales 392,900 341,600 708,100 617,400
Building Materials Distribution [Member] | Engineered wood products [Member]        
Revenue from External Customer [Line Items]        
Sales $ 218,200 $ 185,300 $ 404,800 $ 346,200
[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 six months ended June 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.