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Basis Of Presentation (Schedule Of Allowance For Doubtful Accounts) (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2020
USD ($)
ADDITIONS, (CHARGED) CREDITED TO COSTS AND EXPENSES $ (871)
Roto-Rooter [Member]  
BALANCE AT BEGINNING OF PERIOD (353)
ADDITIONS, (CHARGED) CREDITED TO COSTS AND EXPENSES (871)
ADDITIONS, (CHARGED) CREDITED TO OTHER ACCOUNTS (475)
DEDUCTIONS 366
OTHER (92)
BALANCE AT END OF PERIOD $ (1,425)