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Revenue Recognition (Schedule Of Disaggregated Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Gross revenue	$ 340,801	$ 302,619	$ 989,658	$ 914,412
Net revenue	333,728	296,536	965,066	893,506
Roto-Rooter [Member]
Gross revenue	237,162	235,566	733,391	711,971
Implicit price concessions and credit memos	(6,358)	(5,630)	(19,952)	(17,168)
Net revenue	230,804	229,936	713,439	694,803
Roto-Rooter [Member] | Drain cleaning [Member]
Gross revenue	59,164	62,764	186,016	193,983
Roto-Rooter [Member] | Plumbing [Member]
Gross revenue	49,113	48,737	148,285	145,294
Roto-Rooter [Member] | Excavation [Member]
Gross revenue	56,904	54,164	174,032	164,898
Roto-Rooter [Member] | Other [Member]
Gross revenue	334	193	711	513
Roto-Rooter [Member] | Short-Term Core [Member]
Gross revenue	165,515	165,858	509,044	504,688
Roto-Rooter [Member] | Water Restoration [Member]
Gross revenue	45,435	43,645	141,176	127,678
Roto-Rooter [Member] | Independent Contractors [Member]
Gross revenue	20,509	20,474	65,684	62,897
Roto-Rooter [Member] | Franchise Fees [Member]
Gross revenue	1,457	1,559	4,195	4,246
Roto-Rooter [Member] | Other [Member]
Gross revenue	$ 4,246	$ 4,030	$ 13,292	$ 12,462

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