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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, 2020	Dec. 31, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Revenue	$ 2,079,583	$ 1,938,555	$ 1,782,648
Annualized Amortization of	$ 10,000	4,300	399
Franchise [Member]
Business Acquisition [Line Items]
Revenue		6,100	6,382
HSW RR, Inc [Member]
Business Acquisition [Line Items]
Revenue		20,141	1,782
Roto-Rooter, Oakland [Member]
Business Acquisition [Line Items]
Revenue		5,150	95
HSW And Oakland [Member]
Business Acquisition [Line Items]
Revenue		$ 25,291	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