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Goodwill and Other Intangible Assets (2019 Acquisitions) (Narrative) (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2020
USD ($)
yr
Mar. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
acquisition
Business Acquisition [Line Items]      
Business combinations, number of acquisitions | acquisition     6
Business combinations, cash, net of cash acquired $ 0 $ 93,684  
Business combinations, contingent consideration liabilities, range of potential undiscounted earn-out liabilities, low 60,000    
Business combinations, contingent consideration liabilities, range of potential undiscounted earn-out liabilities, high 256,000    
2019 Acquisitions [Member]      
Business Acquisition [Line Items]      
Business combinations, percentage of interests acquired     96.00%
Business combinations, cash, net of cash acquired     $ 175,100
Business combinations, contingent consideration, earn-out liabilities     22,200
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 $ 71,000    
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     4
Power Generation and Industrial [Member]      
Business Acquisition [Line Items]      
Business combinations, number of acquisitions | acquisition     1