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Goodwill and Other Intangible Assets (2020 Acquisitions) (Narrative) (Details)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2020
USD ($)
yr
acquisition
Jun. 30, 2019
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2019
acquisition
Business Acquisition [Line Items]        
Business combinations, number of acquisitions | acquisition 4     6
Business combinations, cash, net of cash acquired $ 10,493 $ 94,647    
Business combinations, contingent consideration liabilities, range of potential undiscounted earn-out liabilities, low 20,000      
Business combinations, contingent consideration liabilities, range of potential undiscounted earn-out liabilities, high $ 206,000      
2020 Acquisitions [Member]        
Business Acquisition [Line Items]        
Business combinations, percentage of interests acquired 96.00%      
Business combinations, cash, net of cash acquired $ 9,800      
Business combinations, contingent consideration, earn-out liabilities 7,200      
Business combinations, contingent consideration liabilities, range of potential undiscounted earn-out liabilities, high $ 12,000      
2020 Acquisitions [Member] | Expected Term [Member] | Maximum [Member]        
Business Acquisition [Line Items]        
Business combinations, contingent consideration, earn-out period (in years) | yr 5      
Forecast [Member] | 2020 Acquisitions [Member]        
Business Acquisition [Line Items]        
Business combinations, cash, net of cash acquired     $ 2,800  
Communications and Electrical Transmission [Domain]        
Business Acquisition [Line Items]        
Business combinations, number of acquisitions | acquisition 2      
Communications [Member]        
Business Acquisition [Line Items]        
Business combinations, number of acquisitions | acquisition 1     4
Electrical Transmission [Member]        
Business Acquisition [Line Items]        
Business combinations, number of acquisitions | acquisition 1