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Revenue Recognition (Schedule Of Disaggregated Revenue) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Subtotal	$ 1,231,010	$ 1,289,433	$ 1,368,489
Net revenue	1,201,564	1,261,246	1,334,667
Roto-Rooter [Member]
Subtotal	955,859	897,769	762,035
Implicit price concessions and credit memos	(22,460)	(19,754)	(17,119)
Net revenue	933,399	878,015	744,916
Roto-Rooter [Member] | Drain cleaning [Member]
Subtotal	261,606	254,773	218,500
Roto-Rooter [Member] | Plumbing [Member]
Subtotal	194,274	176,051	147,326
Roto-Rooter [Member] | Excavation [Member]
Subtotal	222,945	215,190	184,960
Roto-Rooter [Member] | Other [Member]
Subtotal	708	1,138	1,714
Roto-Rooter [Member] | Short-Term Core [Member]
Subtotal	679,533	647,152	552,500
Roto-Rooter [Member] | Water Restoration [Member]
Subtotal	169,434	153,115	126,378
Roto-Rooter [Member] | Independent Contractors [Member]
Subtotal	84,442	76,858	64,727
Roto-Rooter [Member] | Franchise Fees [Member]
Subtotal	5,591	5,068	4,893
Roto-Rooter [Member] | Other [Member]
Implicit price concessions and credit memos	$ 16,859	$ 15,576	$ 13,537

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