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Segment Information (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2020
USD ($)
segment
Mar. 31, 2019
USD ($)
Segment Reporting, Other Significant Reconciling Item [Line Items]    
Number of reportable segments | segment 3  
Net Sales $ 249,439 $ 227,417
Total consolidated income from operations 15,190 10,566
Renewable Energy and Conservation    
Segment Reporting, Other Significant Reconciling Item [Line Items]    
Net Sales 96,497 68,837
Residential Products    
Segment Reporting, Other Significant Reconciling Item [Line Items]    
Net Sales 103,419 103,709
Industrial and Infrastructure Products    
Segment Reporting, Other Significant Reconciling Item [Line Items]    
Net Sales 49,523 54,871
Operating Segments | Renewable Energy and Conservation    
Segment Reporting, Other Significant Reconciling Item [Line Items]    
Net Sales 96,497 68,837
Total consolidated income from operations 5,699 1,632
Operating Segments | Residential Products    
Segment Reporting, Other Significant Reconciling Item [Line Items]    
Net Sales 103,419 103,709
Total consolidated income from operations 13,725 12,090
Operating Segments | Industrial and Infrastructure Products    
Segment Reporting, Other Significant Reconciling Item [Line Items]    
Net Sales 49,801 55,188
Total consolidated income from operations 3,989 4,129
Intersegment Elimination    
Segment Reporting, Other Significant Reconciling Item [Line Items]    
Net Sales (278) (317)
Corporate    
Segment Reporting, Other Significant Reconciling Item [Line Items]    
Unallocated Corporate Expenses $ (8,223) $ (7,285)