Revenue Recognition (Schedule Of Disaggregated Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Subtotal	$ 329,752	$ 305,001	$ 648,857	$ 611,792
Net revenue	320,861	297,781	631,339	596,970
Roto-Rooter [Member]
Subtotal	239,359	239,406	496,228	476,405
Implicit price concessions and credit memos	(6,404)	(5,899)	(13,594)	(11,538)
Net revenue	232,955	233,507	482,634	464,867
Roto-Rooter [Member] | Drain cleaning [Member]
Subtotal	60,362	64,532	126,851	131,219
Roto-Rooter [Member] | Plumbing [Member]
Subtotal	48,719	48,885	99,172	96,557
Roto-Rooter [Member] | Excavation [Member]
Subtotal	57,552	55,546	117,128	110,734
Roto-Rooter [Member] | Other [Member]
Subtotal	184	155	377	321
Roto-Rooter [Member] | Short-Term Core [Member]
Subtotal	166,817	169,118	343,528	338,831
Roto-Rooter [Member] | Water Restoration [Member]
Subtotal	44,978	43,673	95,741	84,033
Roto-Rooter [Member] | Independent Contractors [Member]
Subtotal	21,875	21,005	45,175	42,423
Roto-Rooter [Member] | Franchise Fees [Member]
Subtotal	1,388	1,370	2,739	2,688
Roto-Rooter [Member] | Other [Member]
Subtotal	$ 4,301	$ 4,240	$ 9,045	$ 8,430