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Segment Information (Details) $ in Thousands	3 Months Ended			6 Months Ended			12 Months Ended
	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)		Jun. 30, 2017 USD ($) segment	Jun. 30, 2016 USD ($)		Dec. 31, 2016 segment
Segment Reporting Information [Line Items]
Number of Reportable Segments | segment				2			3
Net Sales	$ 1,138,939	$ 1,043,773		$ 2,113,382	$ 1,924,468
Income from operations	42,449	37,867		63,543	51,272
Operating Segments [Member]
Segment Reporting Information [Line Items]
Income from operations	49,904	45,426		77,257	64,684
Operating Segments [Member] | Wood Products [Member]
Segment Reporting Information [Line Items]
Net Sales	350,277	346,358		675,934	649,815
Income from operations	15,395	16,309		22,783	22,194
Operating Segments [Member] | Building Materials Distribution [Member]
Segment Reporting Information [Line Items]
Net Sales	980,706	850,042		1,796,389	1,567,296
Income from operations	34,509	29,117		54,474	42,490
Intersegment Eliminations and Other [Member]
Segment Reporting Information [Line Items]
Net Sales	(192,044)	(152,627)	[1]	(358,941)	(292,643)	[1]
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Income from operations	$ (7,455)	$ (7,559)		$ (13,714)	$ (13,412)
[1] Primarily represents intersegment sales from our Wood Products segment to our Building Materials Distribution segment.

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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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