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Segment Information Segment Sales to External Customers by Product Line (Details) $ in Thousands		3 Months Ended
		Mar. 31, 2019 USD ($) segment	Mar. 31, 2018 USD ($)
Segment Reporting [Abstract]
Number of Reportable Segments | segment		2
Revenue from External Customer [Line Items]
Sales		$ 1,042,086	$ 1,182,841
Wood Products and Building Materials Distribution [Member]
Revenue from External Customer [Line Items]
Sales		1,042,100	1,182,800
Wood Products [Member]
Revenue from External Customer [Line Items]
Sales		$ 134,400	190,500
Intersegment EWP Sales Volumes As Percentage to Total EWP Sales Volumes		75.00%
Wood Products [Member] | Laminated Veneer Lumber [Member]
Revenue from External Customer [Line Items]
Sales	[1]	$ 11,900	13,500
Wood Products [Member] | I-joists [Member]
Revenue from External Customer [Line Items]
Sales	[1]	5,300	9,900
Wood Products [Member] | Other Engineered Wood Products [Member]
Revenue from External Customer [Line Items]
Sales	[1]	5,700	6,600
Wood Products [Member] | Plywood and veneer [Member]
Revenue from External Customer [Line Items]
Sales	[1]	67,400	87,100
Wood Products [Member] | Lumber [Member]
Revenue from External Customer [Line Items]
Sales	[1]	13,200	24,900
Wood Products [Member] | Byproducts [Member]
Revenue from External Customer [Line Items]
Sales	[1]	20,100	22,100
Wood Products [Member] | Particleboard [Member]
Revenue from External Customer [Line Items]
Sales	[1]	0	10,800
Wood Products [Member] | Other - Wood Products [Member]
Revenue from External Customer [Line Items]
Sales	[1]	10,800	15,500
Building Materials Distribution [Member]
Revenue from External Customer [Line Items]
Sales		907,700	992,400
Building Materials Distribution [Member] | Commodity product line [Member]
Revenue from External Customer [Line Items]
Sales		398,400	490,600
Building Materials Distribution [Member] | General line [Member]
Revenue from External Customer [Line Items]
Sales		323,400	315,200
Building Materials Distribution [Member] | Engineered wood products [Member]
Revenue from External Customer [Line Items]
Sales		$ 185,900	$ 186,600
[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 three months ended March 31, 2019, approximately 75% of Wood Products' EWP sales volumes were to our Building Materials Distribution segment.

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Intersegment Engineered Wood Products (EWP) Sales Volumes As Percentage to Total EWP Sales Volumes

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