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Segment Information (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
segment
Sep. 30, 2018
USD ($)
Segment Reporting, Other Significant Reconciling Item [Line Items]        
Number of reportable segments | segment     3  
Net Sales $ 299,236 $ 280,086 $ 789,308 $ 761,459
Total consolidated income from operations 31,420 29,404 68,592 75,521
Renewable Energy and Conservation        
Segment Reporting, Other Significant Reconciling Item [Line Items]        
Net Sales 116,771 98,486 261,612 229,187
Residential Products        
Segment Reporting, Other Significant Reconciling Item [Line Items]        
Net Sales 126,275 125,839 360,417 360,915
Industrial and Infrastructure Products        
Segment Reporting, Other Significant Reconciling Item [Line Items]        
Net Sales 56,190 55,761 167,279 171,357
Operating Segments | Renewable Energy and Conservation        
Segment Reporting, Other Significant Reconciling Item [Line Items]        
Net Sales 116,771 98,486 261,612 229,187
Total consolidated income from operations 19,633 15,072 30,914 28,690
Operating Segments | Residential Products        
Segment Reporting, Other Significant Reconciling Item [Line Items]        
Net Sales 126,275 125,839 360,417 360,915
Total consolidated income from operations 17,012 20,138 49,880 57,572
Operating Segments | Industrial and Infrastructure Products        
Segment Reporting, Other Significant Reconciling Item [Line Items]        
Net Sales 56,361 56,033 168,096 172,218
Total consolidated income from operations 5,462 2,892 13,660 12,098
Intersegment Elimination        
Segment Reporting, Other Significant Reconciling Item [Line Items]        
Net Sales (171) (272) (817) (861)
Corporate        
Segment Reporting, Other Significant Reconciling Item [Line Items]        
Unallocated Corporate Expenses $ (10,687) $ (8,698) $ (25,862) $ (22,839)