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Acquisitions (Schedule Of Franchise Revenue, Valuation And Amortization Of Reacquired Franchise Rights) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2018
Business Acquisition [Line Items] |  |  |  |
Revenue | $ 2,134,963 | $ 2,139,261 | $ 2,079,583 |
Annualized Amortization of | $ 10,100 | $ 10,000 | $ 10,000 |
Franchise [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Revenue |  |  |  | $ 6,382
HSW RR, Inc [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Revenue |  |  |  | 1,782
Roto-Rooter, Oakland [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Revenue |  |  |  | 95
HSW And Oakland [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Revenue |  |  |  | 1,877
All Other Franchise Territories [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Revenue |  |  |  | 4,505
Reacquired Franchise Rights [Member] | HSW RR, Inc [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Valuation of |  |  |  | 52,980
Annualized Amortization of |  |  |  | 7,258
Reacquired Franchise Rights [Member] | Roto-Rooter, Oakland [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Valuation of |  |  |  | 6,190
Annualized Amortization of |  |  |  | 825
Reacquired Franchise Rights [Member] | HSW And Oakland [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Valuation of |  |  |  | 59,170
Annualized Amortization of |  |  |  | $ 8,083

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