Revenue Recognition (Schedule Of Disaggregated Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Gross revenue	$ 382,909	$ 329,752	$ 746,325	$ 648,857
Net revenue	374,558	320,861	728,564	631,339
Roto-Rooter [Member]
Gross revenue	228,119	239,359	470,502	496,228
Implicit price concessions and credit memos	(6,797)	(6,404)	(13,953)	(13,594)
Net revenue	221,322	232,955	456,549	482,634
Roto-Rooter [Member] | Drain cleaning [Member]
Gross revenue	57,865	60,362	119,486	126,851
Roto-Rooter [Member] | Plumbing [Member]
Gross revenue	46,046	48,719	94,144	99,172
Roto-Rooter [Member] | Excavation [Member]
Gross revenue	55,713	57,552	114,331	117,128
Roto-Rooter [Member] | Other [Member]
Gross revenue	202	184	446	377
Roto-Rooter [Member] | Short-Term Core [Member]
Gross revenue	159,826	166,817	328,407	343,528
Roto-Rooter [Member] | Water Restoration [Member]
Gross revenue	42,777	44,978	89,454	95,741
Roto-Rooter [Member] | Independent Contractors [Member]
Gross revenue	18,255	21,875	37,871	45,175
Roto-Rooter [Member] | Franchisee Fees [Member]
Gross revenue	1,398	1,388	2,890	2,739
Roto-Rooter [Member] | Other [Member]
Gross revenue	$ 5,863	$ 4,301	$ 11,880	$ 9,045