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Acquisitions Of Businesses (Details)
$ in Thousands
9 Months Ended 10 Months Ended
Sep. 16, 2019
Company
Aug. 01, 2019
Company
May 10, 2019
Company
Apr. 01, 2019
Company
Jan. 04, 2019
Company
Nov. 01, 2018
Company
Oct. 02, 2018
Company
May 03, 2018
Company
Apr. 04, 2018
Company
Sep. 30, 2019
USD ($)
Nov. 01, 2018
USD ($)
Dec. 31, 2018
USD ($)
Business Acquisition [Line Items]                        
Goodwill                   $ 1,019,590   $ 990,887
Number of businesses acquired | Company 1 1 1 1 1 1 1 1 1      
2019 Acquisitions                        
Business Acquisition [Line Items]                        
Purchase price                   83,600    
Working capital acquired                   25,300    
Other net assets                   1,000    
Goodwill                   28,300    
Identifiable intangible assets                   $ 29,000    
2018 Acquisitions                        
Business Acquisition [Line Items]                        
Purchase price                     $ 71,600  
Working capital acquired                       8,700
Goodwill                       26,300
Identifiable intangible assets                       $ 36,600