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Segment Information (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Segment Reporting Information [Line Items]
Sales		$ 1,230,081	$ 1,408,132	$ 2,272,167	$ 2,590,973
Income from operations		45,132	74,056	66,786	125,860
Wood Products [Member]
Segment Reporting Information [Line Items]
Sales		132,700	194,300	267,100	384,800
Building Materials Distribution [Member]
Segment Reporting Information [Line Items]
Sales		1,097,400	1,213,800	2,005,100	2,206,100
Operating Segments [Member]
Segment Reporting Information [Line Items]
Income from operations		52,708	84,195	81,855	142,704
Operating Segments [Member] | Wood Products [Member]
Segment Reporting Information [Line Items]
Sales		334,256	425,483	653,779	823,474
Income from operations		18,908	36,482	30,538	62,603
Operating Segments [Member] | Building Materials Distribution [Member]
Segment Reporting Information [Line Items]
Sales		1,097,421	1,213,783	2,005,129	2,206,164
Income from operations		33,800	47,713	51,317	80,101
Intersegment Eliminations and Other [Member]
Segment Reporting Information [Line Items]
Sales	[1]	(201,596)	(231,134)	(386,741)	(438,665)
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Income from operations		$ (7,576)	$ (10,139)	$ (15,069)	$ (16,844)
[1] Primarily represents intersegment sales from our Wood Products segment to our Building Materials Distribution segment.

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