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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, 2019	Dec. 31, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Revenue	$ 1,938,555	$ 1,782,648	$ 1,666,724
Annualized Amortization of	4,300	399	$ 137
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]
Business Acquisition [Line Items]
Annualized Amortization of	$ 4,000
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