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Goodwill and Identifiable Intangible Assets, Net (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Asset Impairment Charges [Abstract]      
Goodwill $ 464,392 $ 332,447 $ 235,182
Impairment testing, Scenario one      
Asset Impairment Charges [Abstract]      
Impairment testing, discounted cash flow analysis weightage assigned   50.00%  
Impairment testing, Scenario two      
Asset Impairment Charges [Abstract]      
Impairment testing, public company approach weightage assigned   50.00%  
Walker      
Asset Impairment Charges [Abstract]      
Percentage of fair values in excess of carrying value of two acquired reporting units   27.00%  
Percentage of fair values in excess of carrying value for Walker reporting unit 24.00%    
Goodwill $ 96,800