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Acquisitions (Schedule Of Business Acquisitions Revenue And Net Income) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Business Acquisition [Line Items] |  |  |
Service revenue and sales | $ 1,938,555 | $ 1,782,648 | $ 1,666,724
Net income/(loss) | 219,923 | 205,544 | $ 98,177
HSW RR, Inc [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Service revenue and sales | 20,141 | 1,782 |
Net income/(loss) | (2,777) |  |
Roto-Rooter, Oakland [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Service revenue and sales | 5,150 | 95 |
Net income/(loss) | 231 |  |
HSW And Oakland [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Service revenue and sales | 25,291 | $ 1,877 |
Net income/(loss) | $ (2,546) |  |

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