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Acquisitions (Schedule Of Franchise Revenue, Valuation And Amortization Of Reacquired Franchise Rights) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Business Acquisition [Line Items] |  |  |
Revenue | $ 1,938,555 | $ 1,782,648 | $ 1,666,724
Annualized Amortization of | 4,300 | 399 | $ 137
Franchise [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Revenue | 6,100 | 6,382 |
HSW RR, Inc [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Revenue | 20,141 | 1,782 |
Roto-Rooter, Oakland [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Revenue | 5,150 | 95 |
HSW And Oakland [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Revenue | 25,291 | 1,877 |
All Other Franchise Territories [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Revenue |  | 4,505 |
Reacquired Franchise Rights [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Annualized Amortization of | $ 4,000 |  |
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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