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Segment Information (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018
Segment Reporting Information [Line Items]
Sales		$ 1,042,086	$ 1,182,841
Income from operations		21,654	51,804
Wood Products [Member]
Segment Reporting Information [Line Items]
Sales		134,400	190,500
Building Materials Distribution [Member]
Segment Reporting Information [Line Items]
Sales		907,700	992,400
Operating Segments [Member]
Segment Reporting Information [Line Items]
Income from operations		29,147	58,509
Operating Segments [Member] | Wood Products [Member]
Segment Reporting Information [Line Items]
Sales		319,523	397,991
Income from operations		11,630	26,121
Operating Segments [Member] | Building Materials Distribution [Member]
Segment Reporting Information [Line Items]
Sales		907,708	992,381
Income from operations		17,517	32,388
Intersegment Eliminations and Other [Member]
Segment Reporting Information [Line Items]
Sales	[1]	(185,145)	(207,531)
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Income from operations		$ (7,493)	$ (6,705)
[1] Primarily represents intersegment sales from our Wood Products segment to our Building Materials Distribution segment.

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