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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, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) segment	Jun. 30, 2018 USD ($)
Segment Reporting [Abstract]
Number of Reportable Segments | segment				2
Revenue from External Customer [Line Items]
Sales		$ 1,230,081	$ 1,408,132	$ 2,272,167	$ 2,590,973
Wood Products and Building Materials Distribution [Member]
Revenue from External Customer [Line Items]
Sales		1,230,100	1,408,100	2,272,200	2,591,000
Wood Products [Member]
Revenue from External Customer [Line Items]
Sales		132,700	194,300	$ 267,100	384,800
Intersegment EWP Sales Volumes As Percentage to Total EWP Sales Volumes				76.00%
Wood Products [Member] | Laminated Veneer Lumber [Member]
Revenue from External Customer [Line Items]
Sales	[1]	12,000	9,800	$ 23,900	23,200
Wood Products [Member] | I-joists [Member]
Revenue from External Customer [Line Items]
Sales	[1]	8,000	7,900	13,300	17,800
Wood Products [Member] | Other Engineered Wood Products [Member]
Revenue from External Customer [Line Items]
Sales	[1]	8,600	5,800	14,300	12,300
Wood Products [Member] | Plywood and veneer [Member]
Revenue from External Customer [Line Items]
Sales	[1]	63,500	96,700	130,900	183,700
Wood Products [Member] | Lumber [Member]
Revenue from External Customer [Line Items]
Sales	[1]	14,000	25,000	27,200	49,900
Wood Products [Member] | Byproducts [Member]
Revenue from External Customer [Line Items]
Sales	[1]	18,000	22,800	38,000	44,900
Wood Products [Member] | Particleboard [Member]
Revenue from External Customer [Line Items]
Sales	[1]	0	11,800	0	22,600
Wood Products [Member] | Other - Wood Products [Member]
Revenue from External Customer [Line Items]
Sales	[1]	8,600	14,700	19,400	30,200
Building Materials Distribution [Member]
Revenue from External Customer [Line Items]
Sales		1,097,400	1,213,800	2,005,100	2,206,100
Building Materials Distribution [Member] | Commodity product line [Member]
Revenue from External Customer [Line Items]
Sales		450,700	602,700	849,000	1,093,200
Building Materials Distribution [Member] | General line [Member]
Revenue from External Customer [Line Items]
Sales		429,600	392,900	753,100	708,100
Building Materials Distribution [Member] | Engineered wood products [Member]
Revenue from External Customer [Line Items]
Sales		$ 217,200	$ 218,200	$ 403,000	$ 404,800
[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 six months ended June 30, 2019, approximately 76% of Wood Products' EWP sales volumes were to our Building Materials Distribution segment.

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