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Acquisitions Of Businesses (Details)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2023
USD ($)
Company
Dec. 31, 2022
USD ($)
Company
Business Acquisition [Line Items]    
Number of businesses acquired | Company 7 6
Goodwill $ 953,359 $ 919,151
2022Acquisitions    
Business Acquisition [Line Items]    
Purchase price   100,800
Working capital acquired   7,100
Other net liabilities   1,100
Goodwill   28,900
Identifiable intangible assets   $ 65,900
2023Acquisitions    
Business Acquisition [Line Items]    
Purchase price 92,800  
Working capital acquired 9,100  
Other net liabilities 6,700  
Goodwill 34,200  
Identifiable intangible assets 56,200  
Goodwill and identifiable intangible assets, tax deductible amount $ 23,200