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Revenue Recognition (Schedule Of Disaggregated Revenue) (Details) - Roto-Rooter [Member] - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Subtotal | $ 216,817 | $ 184,622
Implicit price concessions and credit memos | (5,245) | (6,740)
Net revenue | 211,572 | 177,882
Short-Term Core Service Jobs [Member] |  |
Subtotal | 155,350 | 134,424
Water Restoration [Member] |  |
Subtotal | 37,435 | 29,246
Contractor Revenue [Member] |  |
Subtotal | 18,760 | 16,228
Franchise Fees [Member] |  |
Subtotal | 1,327 | 1,190
All Other [Member] |  |
Subtotal | $ 3,945 | $ 3,534

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