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Goodwill and Other Intangible Assets (2019 Acquisitions) (Narrative) (Details)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2020
USD ($)
acquisition
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
yr
acquisition
Business Acquisition [Line Items]      
Business combinations, number of acquisitions | acquisition 4   6
Business combinations, cash, net of cash acquired $ 11,251 $ 94,647  
Business combinations, contingent consideration liabilities, range of potential undiscounted earn-out liabilities, low 34,000    
Business combinations, contingent consideration liabilities, range of potential undiscounted earn-out liabilities, high 199,000    
2019 Acquisitions [Member]      
Business Acquisition [Line Items]      
Business combinations, percentage of interests acquired     96.00%
Business combinations, cash, net of cash acquired     $ 176,600
Business combinations, contingent consideration, earn-out liabilities     22,300
Business combinations, contingent consideration, mandatorily redeemable non-controlling interest     $ 17,800
Business combinations, contingent consideration liabilities, range of potential undiscounted earn-out liabilities, low 2,000    
Business combinations, contingent consideration liabilities, range of potential undiscounted earn-out liabilities, high $ 62,000    
2019 Acquisitions [Member] | Expected Term [Member] | Minimum [Member]      
Business Acquisition [Line Items]      
Business combinations, contingent consideration, earn-out period (in years) | yr     3
2019 Acquisitions [Member] | Expected Term [Member] | Maximum [Member]      
Business Acquisition [Line Items]      
Business combinations, contingent consideration, earn-out period (in years) | yr     5
Oil and Gas [Member]      
Business Acquisition [Line Items]      
Business combinations, number of acquisitions | acquisition     1
Communications [Member]      
Business Acquisition [Line Items]      
Business combinations, number of acquisitions | acquisition 1   4
Clean Energy and Infrastructure [Member]      
Business Acquisition [Line Items]      
Business combinations, number of acquisitions | acquisition     1