Segment Information (Details 2) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Net sales and long-lived assets by geographical area
Net sales	$ 308,007	$ 263,002	$ 552,786	$ 482,869
Wood construction products
Net sales and long-lived assets by geographical area
Net sales	260,103	224,013	472,650	414,890
Concrete construction products
Net sales and long-lived assets by geographical area
Net sales	47,859	38,917	80,015	67,734
Other
Net sales and long-lived assets by geographical area
Net sales	$ 45	$ 72	$ 121	$ 245