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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, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
segment
Sep. 30, 2019
USD ($)
Segment Reporting [Abstract]        
Number of Reportable Segments | segment     2  
Revenue from External Customer [Line Items]        
Sales $ 1,589,313 $ 1,269,524 $ 4,002,607 $ 3,541,691
Wood Products and Building Materials Distribution [Member]        
Revenue from External Customer [Line Items]        
Sales 1,589,300 1,269,500 4,002,600 3,541,700
Wood Products [Member]        
Revenue from External Customer [Line Items]        
Sales 151,600 123,900 $ 380,700 391,000
Intersegment EWP Sales Volumes As Percentage to Total EWP Sales Volumes     80.00%  
Wood Products [Member] | Laminated Veneer Lumber [Member]        
Revenue from External Customer [Line Items]        
Sales [1] 4,300 7,900 $ 15,600 31,800
Wood Products [Member] | I-joists [Member]        
Revenue from External Customer [Line Items]        
Sales [1] 3,300 4,900 10,400 18,200
Wood Products [Member] | Other engineered wood products [Member]        
Revenue from External Customer [Line Items]        
Sales [1] 5,600 6,200 17,200 20,500
Wood Products [Member] | Plywood and veneer [Member]        
Revenue from External Customer [Line Items]        
Sales [1] 105,100 64,600 234,200 195,500
Wood Products [Member] | Lumber [Member]        
Revenue from External Customer [Line Items]        
Sales [1] 13,300 13,500 37,900 40,700
Wood Products [Member] | Byproducts [Member]        
Revenue from External Customer [Line Items]        
Sales [1] 16,100 18,300 52,500 56,400
Wood Products [Member] | Other [Member]        
Revenue from External Customer [Line Items]        
Sales [1] 3,900 8,500 12,900 27,800
Building Materials Distribution [Member]        
Revenue from External Customer [Line Items]        
Sales 1,437,700 1,145,600 3,621,900 3,150,700
Building Materials Distribution [Member] | Commodity product line [Member]        
Revenue from External Customer [Line Items]        
Sales 718,900 467,900 1,649,100 1,316,700
Building Materials Distribution [Member] | General line [Member]        
Revenue from External Customer [Line Items]        
Sales 483,000 454,500 1,328,500 1,207,700
Building Materials Distribution [Member] | Engineered wood products [Member]        
Revenue from External Customer [Line Items]        
Sales $ 235,800 $ 223,300 $ 644,300 $ 626,400
[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, 2020, approximately 80% of Wood Products' EWP sales volumes were to our Building Materials Distribution segment.