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Acquisitions (Schedule Of Franchise Revenue, Valuation And Amortization Of Reacquired Franchise Rights) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2018
Business Acquisition [Line Items]
Revenue	$ 2,134,963	$ 2,139,261	$ 2,079,583
Annualized Amortization of	$ 10,100	$ 10,000	$ 10,000
Franchise [Member]
Business Acquisition [Line Items]
Revenue				$ 6,382
HSW RR, Inc [Member]
Business Acquisition [Line Items]
Revenue				1,782
Roto-Rooter, Oakland [Member]
Business Acquisition [Line Items]
Revenue				95
HSW And Oakland [Member]
Business Acquisition [Line Items]
Revenue				1,877
All Other Franchise Territories [Member]
Business Acquisition [Line Items]
Revenue				4,505
Reacquired Franchise Rights [Member] \| HSW RR, Inc [Member]
Business Acquisition [Line Items]
Valuation of				52,980
Annualized Amortization of				7,258
Reacquired Franchise Rights [Member] \| Roto-Rooter, Oakland [Member]
Business Acquisition [Line Items]
Valuation of				6,190
Annualized Amortization of				825
Reacquired Franchise Rights [Member] \| HSW And Oakland [Member]
Business Acquisition [Line Items]
Valuation of				59,170
Annualized Amortization of				$ 8,083