Segment Information (Details 2) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Net sales and long-lived assets by geographical area
Net sales	$ 284,178	$ 262,476	$ 836,964	$ 745,345
Wood construction products
Net sales and long-lived assets by geographical area
Net sales	238,230	224,317	710,880	639,207
Concrete construction products
Net sales and long-lived assets by geographical area
Net sales	45,832	38,051	125,847	105,785
Other
Net sales and long-lived assets by geographical area
Net sales	116	108	237	353
North America
Net sales and long-lived assets by geographical area
Net sales	$ 239,898	$ 213,254	$ 705,932	$ 612,765