Acquisitions (Schedule Of Business Acquisitions) (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Goodwill	$ 576,600	$ 510,570
HSW RR, Inc [Member]
Business Acquisition [Line Items]
Goodwill	55,448
Working capital	3,574
Property, plant, and equipment	5,699
Other assets and liabilities - net	(96)
Purchase price	119,965
Roto-Rooter, Oakland [Member]
Business Acquisition [Line Items]
Goodwill	10,535
Working capital	22
Property, plant, and equipment	675
Other assets and liabilities - net	23
Purchase price	18,045
HSW And Oakland [Member]
Business Acquisition [Line Items]
Goodwill	65,983
Working capital	3,596
Property, plant, and equipment	6,374
Other assets and liabilities - net	(73)
Purchase price	138,010
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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The amount of property, plant, and equipment 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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