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Acquisitions Of Businesses (Details) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2021 USD ($) Company	Dec. 31, 2020 USD ($) Company
Business Acquisition [Line Items]
Number of businesses acquired | Company	5	3
Goodwill	$ 888,303	$ 851,783
2020 Acquisitions
Business Acquisition [Line Items]
Purchase price		50,300
Working capital acquired		3,000
Other net liabilities		3,900
Goodwill		13,100
Identifiable intangible assets		$ 38,100
2021 Acquisitions
Business Acquisition [Line Items]
Purchase price	125,400
Working capital acquired	23,100
Other net liabilities	1,600
Goodwill	36,400
Identifiable intangible assets	$ 67,500

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Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

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