Segment Information (Details) $ in Thousands	3 Months Ended			12 Months Ended
	Mar. 31, 2017 USD ($) segment	Mar. 31, 2016 USD ($)		Dec. 31, 2016 segment
Segment Reporting Information [Line Items]
Number of Reportable Segments | segment	2			3
Net Sales	$ 974,443	$ 880,695
Income from operations	21,094	13,405
Operating Segments [Member]
Segment Reporting Information [Line Items]
Income from operations	27,353	19,258
Operating Segments [Member] | Wood Products [Member]
Segment Reporting Information [Line Items]
Net Sales	325,657	303,457
Income from operations	7,388	5,885
Operating Segments [Member] | Building Materials Distribution [Member]
Segment Reporting Information [Line Items]
Net Sales	815,683	717,254
Income from operations	19,965	13,373
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Net Sales	(166,897)	(140,016)	[1]
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Income from operations	$ (6,259)	$ (5,853)

[1] Primarily represents intersegment sales from our Wood Products segment to our Building Materials Distribution segment.