Revenue Recognition (Schedule Of Disaggregated Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Gross revenue	$ 363,416	$ 319,105
Net revenue	354,007	310,478
Roto-Rooter [Member]
Gross revenue	242,381	256,869
Implicit price concessions and credit memos	(7,155)	(7,190)
Net revenue	235,226	249,679
Roto-Rooter [Member] | Drain cleaning [Member]
Gross revenue	61,621	66,489
Roto-Rooter [Member] | Plumbing [Member]
Gross revenue	48,098	50,453
Roto-Rooter [Member] | Excavation [Member]
Gross revenue	58,618	59,576
Roto-Rooter [Member] | Other [Member]
Gross revenue	244	193
Roto-Rooter [Member] | Short-Term Core [Member]
Gross revenue	168,581	176,711
Roto-Rooter [Member] | Water Restoration [Member]
Gross revenue	46,678	50,762
Roto-Rooter [Member] | Independent Contractors [Member]
Gross revenue	19,616	23,300
Roto-Rooter [Member] | Franchise Fees [Member]
Gross revenue	1,491	1,351
Roto-Rooter [Member] | Other [Member]
Gross revenue	$ 6,015	$ 4,745