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Segment Information (Details) $ in Thousands	3 Months Ended			9 Months Ended			12 Months Ended
	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)		Sep. 30, 2017 USD ($) segment	Sep. 30, 2016 USD ($)		Dec. 31, 2016 segment
Segment Reporting Information [Line Items]
Number of Reportable Segments | segment				2			3
Net Sales	$ 1,226,644	$ 1,067,214		$ 3,340,026	$ 2,991,682
Income from operations	56,008	31,307		119,551	82,579
Operating Segments [Member]
Segment Reporting Information [Line Items]
Income from operations	63,406	37,979		140,663	102,663
Operating Segments [Member] | Wood Products [Member]
Segment Reporting Information [Line Items]
Net Sales	366,920	340,928		1,042,854	990,743
Income from operations	24,027	11,564		46,810	33,758
Operating Segments [Member] | Building Materials Distribution [Member]
Segment Reporting Information [Line Items]
Net Sales	1,045,646	889,026		2,842,035	2,456,322
Income from operations	39,379	26,415		93,853	68,905
Intersegment Eliminations and Other [Member]
Segment Reporting Information [Line Items]
Net Sales	(185,922)	(162,740)	[1]	(544,863)	(455,383)	[1]
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Income from operations	$ (7,398)	$ (6,672)		$ (21,112)	$ (20,084)
[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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