Segment Information - Geographic Distribution and Net Sales by Product (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Net sales and long-lived assets by geographical area
Net Sales	$ 262,510	$ 309,932	$ 304,853	$ 259,244	$ 241,845	$ 284,178	$ 308,007	$ 244,780	$ 1,136,539	$ 1,078,809	$ 977,025
Long-Lived Assets	258,257				264,346				258,257	264,346	282,059
Wood construction products
Net sales and long-lived assets by geographical area
Net Sales									948,768	913,202	833,200
Concrete construction products
Net sales and long-lived assets by geographical area
Net Sales									187,462	165,317	143,102
Other
Net sales and long-lived assets by geographical area
Net Sales									309	290	723
United States
Net sales and long-lived assets by geographical area
Net Sales									921,703	860,482	758,181
Long-Lived Assets	210,349				210,063				210,349	210,063	223,184
Canada
Net sales and long-lived assets by geographical area
Net Sales									47,948	46,874	43,176
Long-Lived Assets	1,181				4,257				1,181	4,257	4,650
United Kingdom
Net sales and long-lived assets by geographical area
Net Sales									26,376	27,194	23,157
Long-Lived Assets	1,683				1,417				1,683	1,417	1,459
Germany
Net sales and long-lived assets by geographical area
Net Sales									22,357	22,950	21,821
Long-Lived Assets	10,529				13,221				10,529	13,221	14,153
France
Net sales and long-lived assets by geographical area
Net Sales									39,969	40,182	36,677
Long-Lived Assets	7,010				7,891				7,010	7,891	9,152
Poland
Net sales and long-lived assets by geographical area
Net Sales									11,826	10,200	20,409
Long-Lived Assets	2,770				2,794				2,770	2,794	2,471
Sweden
Net sales and long-lived assets by geographical area
Net Sales									13,792	15,461	16,421
Long-Lived Assets	1,762				1,154				1,762	1,154	1,068
Denmark
Net sales and long-lived assets by geographical area
Net Sales									10,761	11,682	14,723
Long-Lived Assets	2,235				1,454				2,235	1,454	1,601
Norway
Net sales and long-lived assets by geographical area
Net Sales									11,238	12,324	12,902
Long-Lived Assets	0				0				0	0	229
Switzerland
Net sales and long-lived assets by geographical area
Net Sales									5,600	6,939	5,593
Long-Lived Assets	7,781				8,067				7,781	8,067	8,748
Australia
Net sales and long-lived assets by geographical area
Net Sales									4,939	6,119	5,501
Long-Lived Assets	110				199				110	199	268
Belgium
Net sales and long-lived assets by geographical area
Net Sales									5,605	5,547	5,050
Long-Lived Assets	1,913				1,961				1,913	1,961	2,065
The Netherlands
Net sales and long-lived assets by geographical area
Net Sales									4,019	5,068	4,834
Long-Lived Assets	93				81				93	81	110
New Zealand
Net sales and long-lived assets by geographical area
Net Sales									3,606	3,061	2,604
Long-Lived Assets	166				111				166	111	130
Chile
Net sales and long-lived assets by geographical area
Net Sales									3,198	3,233	2,314
Long-Lived Assets	28				41				28	41	61
Other countries
Net sales and long-lived assets by geographical area
Net Sales									3,602	1,493	3,662
Long-Lived Assets	$ 10,647				$ 11,635				$ 10,647	$ 11,635	$ 12,710