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Acquisitions (Schedule Of Franchise Revenue, Valuation And Amortization Of Reacquired Franchise Rights) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2018
Business Acquisition [Line Items] |  |  |  |  |
Revenue | $ 528,297 | $ 480,613 | $ 1,546,294 | $ 1,416,231 |
Franchise [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Revenue |  |  |  |  | $ 6,382
HSW RR, Inc [Member] | Franchise [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Revenue |  |  |  |  | 1,782
Roto-Rooter, Oakland [Member] | Franchise [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Revenue |  |  |  |  | 95
HSW And Oakland [Member] | Franchise [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Revenue |  |  |  |  | 1,877
All Other Franchise Territories [Member] | Franchise [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Revenue |  |  |  |  | 4,505
Reacquired Franchise Rights [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Annualized Amortization of | $ 2,352 | $ 331 | $ 7,056 | $ 1,103 |
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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