Revenue Recognition (Schedule Of Disaggregated Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Subtotal	$ 302,619	$ 322,757	$ 914,412	$ 965,611
Net revenue	296,536	317,411	893,506	945,135
Roto-Rooter [Member]
Subtotal	235,566	224,845	711,971	667,090
Implicit price concessions and credit memos	(5,630)	(3,589)	(17,168)	(13,942)
Net revenue	229,936	221,256	694,803	653,148
Roto-Rooter [Member] | Drain cleaning [Member]
Subtotal	62,764	63,072	193,983	187,477
Roto-Rooter [Member] | Plumbing [Member]
Subtotal	48,737	45,124	145,294	131,045
Roto-Rooter [Member] | Excavation [Member]
Subtotal	54,164	52,607	164,898	159,714
Roto-Rooter [Member] | Other [Member]
Subtotal	193	254	513	853
Roto-Rooter [Member] | Short-Term Core [Member]
Subtotal	165,858	161,057	504,688	479,089
Roto-Rooter [Member] | Water Restoration [Member]
Subtotal	43,645	39,786	127,678	115,804
Roto-Rooter [Member] | Independent Contractors [Member]
Subtotal	20,474	18,969	62,897	56,754
Roto-Rooter [Member] | Franchise Fees [Member]
Subtotal	1,559	1,260	4,246	3,842
Roto-Rooter [Member] | All Other [Member]
Subtotal	$ 4,030	$ 3,773	$ 12,462	$ 11,601