Segment Information - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Disaggregation of Revenue [Line Items]
Net Sales	$ 249,439	$ 227,417
Renewable Energy and Conservation
Disaggregation of Revenue [Line Items]
Net Sales	96,497	68,837
Residential Products
Disaggregation of Revenue [Line Items]
Net Sales	103,419	103,709
Industrial and Infrastructure Products
Disaggregation of Revenue [Line Items]
Net Sales	49,523	54,871
Point in Time
Disaggregation of Revenue [Line Items]
Net Sales	156,414	155,469
Point in Time | Renewable Energy and Conservation
Disaggregation of Revenue [Line Items]
Net Sales	14,588	7,290
Point in Time | Residential Products
Disaggregation of Revenue [Line Items]
Net Sales	102,331	102,892
Point in Time | Industrial and Infrastructure Products
Disaggregation of Revenue [Line Items]
Net Sales	39,495	45,287
Over Time
Disaggregation of Revenue [Line Items]
Net Sales	93,025	71,948
Over Time | Renewable Energy and Conservation
Disaggregation of Revenue [Line Items]
Net Sales	81,909	61,547
Over Time | Residential Products
Disaggregation of Revenue [Line Items]
Net Sales	1,088	817
Over Time | Industrial and Infrastructure Products
Disaggregation of Revenue [Line Items]
Net Sales	$ 10,028	$ 9,584