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Goodwill and Other Intangible Assets (2020 Acquisitions) (Narrative) (Details)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2020
USD ($)
yr
acquisition
Business Acquisition [Line Items]        
Business combinations, number of acquisitions       5
Cash, net of cash acquired | $ $ 589,055 $ 10,493    
Install to Home        
Business Acquisition [Line Items]        
Business combinations, number of acquisitions       1
Clean Energy and Infrastructure and Communications        
Business Acquisition [Line Items]        
Business combinations, number of acquisitions       2,000,000
Communications and Energy Infastructure        
Business Acquisition [Line Items]        
Business combinations, number of acquisitions       3
Communications        
Business Acquisition [Line Items]        
Business combinations, number of acquisitions       1
Electrical Transmission        
Business Acquisition [Line Items]        
Business combinations, number of acquisitions       1
2020 Acquisitions        
Business Acquisition [Line Items]        
Cash, net of cash acquired | $       $ 23,600
Estimated fair value of contingent consideration | $       $ 8,300
Acquisition-related contingent consideration liabilities, range of potential undiscounted earn-out liabilities, high | $ $ 12,000      
2020 Acquisitions | Maximum | Expected Term        
Business Acquisition [Line Items]        
Business combinations, contingent consideration, earn-out period (in years) | yr       5
2020 Acquisitions | Forecast        
Business Acquisition [Line Items]        
Cash, net of cash acquired | $     $ 3,100  
2020 Acquisitions | Clean Energy and Infrastructure        
Business Acquisition [Line Items]        
Business combinations, percentage of interests acquired 91.00% 96.00%   91.00%