Acquisitions (Schedule Of Business Acquisitions) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Business Acquisition [Line Items]
Goodwill	$ 578,519	$ 577,367
HSW RR, Inc [Member]
Business Acquisition [Line Items]
Goodwill		56,191
Property, plant, and equipment		5,998
Working capital		3,760
Other assets and liabilities - net		128
Purchase price		121,417
Roto-Rooter, Oakland [Member]
Business Acquisition [Line Items]
Goodwill		10,535
Property, plant, and equipment		675
Working capital		22
Other assets and liabilities - net		23
Purchase price		18,045
HSW And Oakland [Member]
Business Acquisition [Line Items]
Goodwill		66,726
Property, plant, and equipment		6,673
Working capital		3,782
Other assets and liabilities - net		151
Purchase price		139,462
Reacquired Franchise Rights [Member] \| HSW RR, Inc [Member]
Business Acquisition [Line Items]
Finite-lived intangibles		52,980
Reacquired Franchise Rights [Member] \| Roto-Rooter, Oakland [Member]
Business Acquisition [Line Items]
Finite-lived intangibles		6,190
Reacquired Franchise Rights [Member] \| HSW And Oakland [Member]
Business Acquisition [Line Items]
Finite-lived intangibles		59,170
Customer Relationships [Member] \| HSW RR, Inc [Member]
Business Acquisition [Line Items]
Finite-lived intangibles		2,220
Customer Relationships [Member] \| Roto-Rooter, Oakland [Member]
Business Acquisition [Line Items]
Finite-lived intangibles		500
Customer Relationships [Member] \| HSW And Oakland [Member]
Business Acquisition [Line Items]
Finite-lived intangibles		2,720
Non-Compete Agreements [Member] \| HSW RR, Inc [Member]
Business Acquisition [Line Items]
Finite-lived intangibles		140
Non-Compete Agreements [Member] \| Roto-Rooter, Oakland [Member]
Business Acquisition [Line Items]
Finite-lived intangibles		100
Non-Compete Agreements [Member] \| HSW And Oakland [Member]
Business Acquisition [Line Items]
Finite-lived intangibles		$ 240

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Amount of assets that are expected to be realized or consumed within one year or the normal operating cycle, if longer, acquired at the acquisition date.

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The amount of identifiable intangible assets recognized as of the acquisition date.

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Amount recognized for assets, including goodwill, in excess of (less than) the aggregate liabilities assumed.

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