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Acquisitions (Schedule Of Business Acquisitions Revenue And Net Income) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Business Acquisition [Line Items]        
Service revenue and sales $ 2,139,261 $ 2,079,583 $ 1,938,555  
Net income/(loss) $ 268,550 $ 319,466 219,923  
HSW RR, Inc [Member]        
Business Acquisition [Line Items]        
Service revenue and sales     20,141 $ 1,782
Net income/(loss)     (2,777)  
Roto-Rooter, Oakland [Member]        
Business Acquisition [Line Items]        
Service revenue and sales     5,150 95
Net income/(loss)     231  
HSW And Oakland [Member]        
Business Acquisition [Line Items]        
Service revenue and sales     25,291 $ 1,877
Net income/(loss)     $ (2,546)