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Segment Information (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Segment Reporting Information [Line Items]
Sales		$ 1,408,132	$ 1,138,939	$ 2,590,973	$ 2,113,382
Income from operations		74,056	42,499	125,860	63,624
Wood Products [Member]
Segment Reporting Information [Line Items]
Sales		194,300	158,200	384,800	317,000
Building Materials Distribution [Member]
Segment Reporting Information [Line Items]
Sales		1,213,800	980,700	2,206,100	1,796,400
Operating Segments [Member]
Segment Reporting Information [Line Items]
Income from operations		84,195	49,904	142,704	77,257
Operating Segments [Member] | Wood Products [Member]
Segment Reporting Information [Line Items]
Sales		425,483	350,277	823,474	675,934
Income from operations		36,482	15,395	62,603	22,783
Operating Segments [Member] | Building Materials Distribution [Member]
Segment Reporting Information [Line Items]
Sales		1,213,783	980,706	2,206,164	1,796,389
Income from operations		47,713	34,509	80,101	54,474
Intersegment Eliminations and Other [Member]
Segment Reporting Information [Line Items]
Sales	[1]	(231,134)	(192,044)	(438,665)	(358,941)
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Income from operations		$ (10,139)	$ (7,405)	$ (16,844)	$ (13,633)
[1] Primarily represents intersegment sales from our Wood Products segment to our Building Materials Distribution segment.

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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