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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, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
segment
Sep. 30, 2018
USD ($)
Segment Reporting [Abstract]        
Number of Reportable Segments | segment     2  
Revenue from External Customer [Line Items]        
Sales $ 1,269,524 $ 1,338,512 $ 3,541,691 $ 3,929,485
Wood Products and Building Materials Distribution [Member]        
Revenue from External Customer [Line Items]        
Sales 1,269,500 1,338,500 3,541,700 3,929,500
Wood Products [Member]        
Revenue from External Customer [Line Items]        
Sales 123,900 179,200 $ 391,000 564,100
Intersegment EWP Sales Volumes As Percentage to Total EWP Sales Volumes     77.00%  
Wood Products [Member] | Laminated Veneer Lumber [Member]        
Revenue from External Customer [Line Items]        
Sales [1] 7,900 9,200 $ 31,800 32,500
Wood Products [Member] | I-joists [Member]        
Revenue from External Customer [Line Items]        
Sales [1] 4,900 8,500 18,200 26,300
Wood Products [Member] | Other Engineered Wood Products [Member]        
Revenue from External Customer [Line Items]        
Sales [1] 6,200 7,300 20,500 19,600
Wood Products [Member] | Plywood and veneer [Member]        
Revenue from External Customer [Line Items]        
Sales [1] 64,600 82,800 195,500 266,500
Wood Products [Member] | Lumber [Member]        
Revenue from External Customer [Line Items]        
Sales [1] 13,500 20,300 40,700 70,200
Wood Products [Member] | Byproducts [Member]        
Revenue from External Customer [Line Items]        
Sales [1] 18,300 23,800 56,400 68,700
Wood Products [Member] | Particleboard [Member]        
Revenue from External Customer [Line Items]        
Sales [1] 0 10,600 0 33,300
Wood Products [Member] | Other - Wood Products [Member]        
Revenue from External Customer [Line Items]        
Sales [1] 8,500 16,700 27,800 46,900
Building Materials Distribution [Member]        
Revenue from External Customer [Line Items]        
Sales 1,145,600 1,159,300 3,150,700 3,365,400
Building Materials Distribution [Member] | Commodity product line [Member]        
Revenue from External Customer [Line Items]        
Sales 467,900 554,800 1,316,700 1,648,000
Building Materials Distribution [Member] | General line [Member]        
Revenue from External Customer [Line Items]        
Sales 454,500 385,800 1,207,700 1,093,900
Building Materials Distribution [Member] | Engineered wood products [Member]        
Revenue from External Customer [Line Items]        
Sales $ 223,300 $ 218,600 $ 626,400 $ 623,400
[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, 2019, approximately 77% of Wood Products' EWP sales volumes were to our Building Materials Distribution segment.