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Acquisitions (Schedule Of Business Acquisitions) (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Business Acquisition [Line Items] |  |
Goodwill | $ 576,600 | $ 510,570
HSW RR, Inc [Member] |  |
Business Acquisition [Line Items] |  |
Goodwill | 55,448 |
Working capital | 3,574 |
Property, plant, and equipment | 5,699 |
Other assets and liabilities - net | (96) |
Purchase price | 119,965 |
Roto-Rooter, Oakland [Member] |  |
Business Acquisition [Line Items] |  |
Goodwill | 10,535 |
Working capital | 22 |
Property, plant, and equipment | 675 |
Other assets and liabilities - net | 23 |
Purchase price | 18,045 |
HSW And Oakland [Member] |  |
Business Acquisition [Line Items] |  |
Goodwill | 65,983 |
Working capital | 3,596 |
Property, plant, and equipment | 6,374 |
Other assets and liabilities - net | (73) |
Purchase price | 138,010 |
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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