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Acquisitions (Schedule Of Business Acquisitions) (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Business Acquisition [Line Items] |  |
Goodwill | $ 578,519 | $ 577,367
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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