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Revenue Recognition (Schedule Of Disaggregated Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Subtotal	$ 319,105	$ 306,791
Net revenue	310,478	299,189
Roto-Rooter [Member]
Subtotal	256,869	236,998
Implicit price concessions and credit memos	(7,190)	(5,638)
Net revenue	249,679	231,360
Roto-Rooter [Member] | Drain cleaning [Member]
Subtotal	66,489	66,687
Roto-Rooter [Member] | Plumbing [Member]
Subtotal	50,453	47,672
Roto-Rooter [Member] | Excavation [Member]
Subtotal	59,576	55,188
Roto-Rooter [Member] | Other [Member]
Subtotal	193	165
Roto-Rooter [Member] | Short-Term Core [Member]
Subtotal	176,711	169,712
Roto-Rooter [Member] | Water Restoration [Member]
Subtotal	50,762	40,360
Roto-Rooter [Member] | Independent Contractors [Member]
Subtotal	23,300	21,418
Roto-Rooter [Member] | Franchise Fees [Member]
Subtotal	1,351	1,317
Roto-Rooter [Member] | Other [Member]
Subtotal	$ 4,745	$ 4,191

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