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Acquisitions Of Businesses (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
USD ($)
Company
Dec. 31, 2022
USD ($)
Company
Dec. 31, 2021
USD ($)
Company
Business Acquisition [Line Items]      
Number of businesses acquired | Company 8 6 8
Goodwill ascribed $ 956,549 $ 919,151 $ 890,268
2022 Acquisitions      
Business Acquisition [Line Items]      
Purchase price   100,800  
Working capital acquired   7,100  
Other net liabilities acquired   1,100  
Goodwill ascribed   28,900  
Identifiable intangible assets ascribed   $ 65,900  
2021 Acquisitions      
Business Acquisition [Line Items]      
Purchase price     131,200
Working capital acquired     22,900
Other net liabilities acquired     600
Goodwill ascribed     38,300
Identifiable intangible assets ascribed     70,600
Goodwill and identifiable intangible assets, tax deductible amount     $ 90,500
2023 Acquisitions      
Business Acquisition [Line Items]      
Purchase price 99,600    
Working capital acquired 9,100    
Other net liabilities acquired 6,100    
Goodwill ascribed 37,400    
Identifiable intangible assets ascribed 59,200    
Goodwill and identifiable intangible assets, tax deductible amount $ 29,600