Segment Information (Details 2) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Net sales and long-lived assets by geographical area
Net sales	$ 304,853	$ 308,007	$ 564,097	$ 552,786
Wood construction products
Net sales and long-lived assets by geographical area
Net sales	258,416	260,103
Concrete construction products
Net sales and long-lived assets by geographical area
Net sales	46,360	47,859
Other
Net sales and long-lived assets by geographical area
Net sales	77	45
North America
Net sales and long-lived assets by geographical area
Net sales	$ 259,073	$ 259,822	$ 480,504	$ 466,034