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Segment Information (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Segment Reporting Information [Line Items]
Sales		$ 1,182,841	$ 974,443
Income from operations		51,804	21,125
Wood Products [Member]
Segment Reporting Information [Line Items]
Sales		190,500	158,800
Building Materials Distribution [Member]
Segment Reporting Information [Line Items]
Sales		992,400	815,700
Operating Segments [Member]
Segment Reporting Information [Line Items]
Income from operations		58,509	27,353
Operating Segments [Member] | Wood Products [Member]
Segment Reporting Information [Line Items]
Sales		397,991	325,657
Income from operations		26,121	7,388
Operating Segments [Member] | Building Materials Distribution [Member]
Segment Reporting Information [Line Items]
Sales		992,381	815,683
Income from operations		32,388	19,965
Intersegment Eliminations and Other [Member]
Segment Reporting Information [Line Items]
Sales	[1]	(207,531)	(166,897)
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Income from operations		$ (6,705)	$ (6,228)
[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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