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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, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
segment
Sep. 30, 2020
USD ($)
Segment Reporting [Abstract]        
Number of Reportable Segments | segment     2  
Revenue from External Customer [Line Items]        
Sales $ 1,879,451 $ 1,589,313 $ 6,143,928 $ 4,002,607
Wood Products [Member]        
Revenue from External Customer [Line Items]        
Sales 158,300 151,600 $ 615,300 $ 380,700
Intersegment EWP Sales Volumes As Percentage to Total EWP Sales Volumes     78.00% 80.00%
Wood Products [Member] | Laminated Veneer Lumber [Member]        
Revenue from External Customer [Line Items]        
Sales [1],[2] (5,100) 4,300 $ 4,600 $ 15,600
Wood Products [Member] | I-joists [Member]        
Revenue from External Customer [Line Items]        
Sales [1],[2] (9,300) 3,300 (1,400) 10,400
Wood Products [Member] | Other engineered wood products [Member]        
Revenue from External Customer [Line Items]        
Sales [1],[2] 9,600 5,600 32,800 17,200
Wood Products [Member] | Plywood and veneer [Member]        
Revenue from External Customer [Line Items]        
Sales [1] 119,200 105,100 443,200 234,200
Wood Products [Member] | Lumber [Member]        
Revenue from External Customer [Line Items]        
Sales [1] 21,300 13,300 65,900 37,900
Wood Products [Member] | Byproducts [Member]        
Revenue from External Customer [Line Items]        
Sales [1] 17,700 16,100 54,300 52,500
Wood Products [Member] | Other [Member]        
Revenue from External Customer [Line Items]        
Sales [1] 4,900 3,900 15,800 12,900
Building Materials Distribution [Member]        
Revenue from External Customer [Line Items]        
Sales 1,721,100 1,437,700 5,528,600 3,621,900
Building Materials Distribution [Member] | Commodity product line [Member]        
Revenue from External Customer [Line Items]        
Sales 770,900 718,900 2,985,300 1,649,100
Building Materials Distribution [Member] | General line [Member]        
Revenue from External Customer [Line Items]        
Sales 580,800 483,000 1,620,200 1,328,500
Building Materials Distribution [Member] | Engineered wood products [Member]        
Revenue from External Customer [Line Items]        
Sales $ 369,500 $ 235,800 $ 923,100 $ 644,300
[1] Amounts represent sales to external customers. Sales are calculated after intersegment sales eliminations to our BMD segment.
[2] Sales of EWP to external customers are net of the cost of all 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, 2021 and 2020, approximately 78% and 80%, respectively, of Wood Products' EWP sales volumes were to our BMD segment.