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Revenue Recognition (Schedule Of Disaggregated Revenue) (Details) - Roto-Rooter [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Subtotal	$ 224,845	$ 196,067	$ 667,090	$ 558,030
Implicit price concessions and credit memos	(3,589)	(4,867)	(13,942)	(14,213)
Net revenue	221,256	191,200	653,148	543,817
Short-Term Core Service Jobs [Member]
Subtotal	161,057	143,089	479,089	404,054
Water Restoration [Member]
Subtotal	39,786	32,137	115,804	92,810
Contractor Revenue [Member]
Subtotal	18,969	16,274	56,754	47,695
Franchise Fees [Member]
Subtotal	1,260	1,235	3,842	3,635
All Other [Member]
Subtotal	$ 3,773	$ 3,332	$ 11,601	$ 9,836

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