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Acquisitions (Schedule Of Business Acquisitions Revenue And Net Income) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Business Acquisition [Line Items] |  |  |
Service revenue and sales | $ 2,079,583 | $ 1,938,555 | $ 1,782,648
Net income/(loss) | $ 319,466 | 219,923 | 205,544
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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