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Acquisitions (Narrative) (Details) $ in Thousands				12 Months Ended
	Jun. 01, 2020 USD ($)	Aug. 02, 2019 USD ($) item	Jul. 01, 2019 USD ($)	Dec. 31, 2022 USD ($) item	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Goodwill [Line Items]
Service revenue and sales				$ 2,134,963	$ 2,139,261	$ 2,079,583
Reacquired Franchise Rights [Member]
Goodwill [Line Items]
Average remaining life				7 years 4 months 24 days
Non-Compete Agreements [Member]
Goodwill [Line Items]
Average remaining life				6 years 4 months 24 days
Franchises, New Jersey [Member]
Goodwill [Line Items]
Number of completed business combinations | item				3
Acquisition, in cash				$ 2,290
Florida Provider [Member]
Goodwill [Line Items]
Acquisition, in cash				$ 1,240
Roto-Rooter, Indiana [Member]
Goodwill [Line Items]
Acquisition date				Jun. 01, 2020
Acquisition, in cash	$ 2,200
HSW RR, Inc [Member]
Goodwill [Line Items]
Service revenue and sales								$ 1,782
HSW RR, Inc [Member] | Reacquired Franchise Rights [Member]
Goodwill [Line Items]
Finite-lived intangibles							$ 59,200
Roto-Rooter, Oakland [Member]
Goodwill [Line Items]
Acquisition date				Jul. 01, 2019
Acquisition, in cash			$ 18,000
Service revenue and sales								95
HSW And Oakland [Member]
Goodwill [Line Items]
Service revenue and sales								1,877
Roto-Rooter [Member] | HSW RR, Inc [Member]
Goodwill [Line Items]
Acquisition, in cash		$ 120,000
Additional business combination cost		$ 1,400
Number of owned and operated franchises | item		14
Franchise [Member]
Goodwill [Line Items]
Service revenue and sales								$ 6,382
Franchise [Member] | Roto-Rooter [Member]
Goodwill [Line Items]
Service revenue and sales							$ 6,100

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