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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