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Revenue Recognition (Schedule Of Disaggregated Revenue) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Subtotal | $ 1,319,851 | $ 1,223,524
Net revenue | 1,281,184 | 1,197,562
Roto-Rooter [Member] |  |
Subtotal | 675,091 | 603,838
Implicit price concessions and credit memos | (17,720) | (18,752)
Net revenue | 657,371 | 585,086
Roto-Rooter [Member] | Short-Term Core Service Jobs [Member] |  |
Subtotal | 482,625 | 425,845
Roto-Rooter [Member] | Water Restoration [Member] |  |
Subtotal | 115,949 | 109,484
Roto-Rooter [Member] | Contractor Revenue [Member] |  |
Subtotal | 58,086 | 50,169
Roto-Rooter [Member] | Franchise Fees [Member] |  |
Subtotal | 6,152 | 6,382
Roto-Rooter [Member] | All Other [Member] |  |
Subtotal | $ 12,279 | $ 11,958

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