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Acquisitions (Narrative) (Details)
3 Months Ended 12 Months Ended
Dec. 11, 2020
USD ($)
Oct. 15, 2020
USD ($)
Feb. 13, 2020
USD ($)
Jan. 15, 2020
USD ($)
Mar. 31, 2021
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
business
Business Acquisition [Line Items]              
Number of businesses acquired | business             5
Goodwill         $ 523,446,000   $ 514,279,000
Acquisition related costs         900,000 $ 1,300,000  
Cost of sales              
Business Acquisition [Line Items]              
Acquisition related costs         0 $ 0  
Renewables              
Business Acquisition [Line Items]              
Number of businesses acquired | business             2
Goodwill         201,489,000   $ 192,527,000
Agtech              
Business Acquisition [Line Items]              
Number of businesses acquired | business             2
Goodwill         84,827,000   $ 84,622,000
Residential              
Business Acquisition [Line Items]              
Number of businesses acquired | business             1
Goodwill         $ 205,452,000   $ 205,452,000
TerraSmart LLC              
Business Acquisition [Line Items]              
Acquisition purchase price             223,700,000
Goodwill             $ 153,690,000
Sunfig Corporation              
Business Acquisition [Line Items]              
Acquisition purchase price $ 3,800,000            
Goodwill $ 3,200,000            
Architectural Mailboxes, LLC              
Business Acquisition [Line Items]              
Acquisition purchase price   $ 26,900,000          
Goodwill   $ 7,400,000          
Delta Separations, LLC              
Business Acquisition [Line Items]              
Acquisition purchase price     $ 47,100,000        
Goodwill     $ 32,200,000        
Thermo Energy Systems              
Business Acquisition [Line Items]              
Acquisition purchase price       $ 7,300,000      
Goodwill       $ 18,700,000