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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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