Revenue from Contract with Customer (Details) - ASC 606	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Wood construction products
Disaggregation of Revenue [Line Items]
Percentage of net sales	84.00%	86.00%
Concrete construction products
Disaggregation of Revenue [Line Items]
Percentage of net sales	16.00%	14.00%
Other
Disaggregation of Revenue [Line Items]
Percentage of net sales	1.00%