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Acquisitions (Schedule Of Business Acquisitions) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Business Acquisition [Line Items] |  |  |
Goodwill | $ 578,585 | $ 577,367 | $ 510,570
HSW RR, Inc [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Goodwill | 56,191 |  |
Property, plant, and equipment | 5,998 |  |
Working capital | 3,760 |  |
Other assets and liabilities - net | 128 |  |
Purchase price | 121,417 |  |
Roto-Rooter, Oakland [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Goodwill | 10,535 |  |
Property, plant, and equipment | 675 |  |
Working capital | 22 |  |
Other assets and liabilities - net | 23 |  |
Purchase price | 18,045 |  |
HSW And Oakland [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Goodwill | 66,726 |  |
Property, plant, and equipment | 6,673 |  |
Working capital | 3,782 |  |
Other assets and liabilities - net | 151 |  |
Purchase price | 139,462 |  |
Reacquired Franchise Rights [Member] | HSW RR, Inc [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Finite-lived intangibles | 52,980 |  |
Reacquired Franchise Rights [Member] | Roto-Rooter, Oakland [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Finite-lived intangibles | 6,190 |  |
Reacquired Franchise Rights [Member] | HSW And Oakland [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Finite-lived intangibles | 59,170 |  |
Customer Relationships [Member] | HSW RR, Inc [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Finite-lived intangibles | 2,220 |  |
Customer Relationships [Member] | Roto-Rooter, Oakland [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Finite-lived intangibles | 500 |  |
Customer Relationships [Member] | HSW And Oakland [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Finite-lived intangibles | 2,720 |  |
Non-Compete Agreements [Member] | HSW RR, Inc [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Finite-lived intangibles | 140 |  |
Non-Compete Agreements [Member] | Roto-Rooter, Oakland [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Finite-lived intangibles | 100 |  |
Non-Compete Agreements [Member] | HSW And Oakland [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Finite-lived intangibles | $ 240 |  |

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