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Acquisitions Of Businesses (Details) $ in Thousands							6 Months Ended	12 Months Ended
	Apr. 01, 2021 Company	Feb. 01, 2021 Company	Jan. 11, 2021 Company	Nov. 06, 2020 Company	Aug. 03, 2020 Company	Jan. 02, 2020 Company	Jun. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)
Business Acquisition [Line Items]
Goodwill							$ 868,819	$ 851,783
Number of businesses acquired | Company	1	1	1	1	1	1
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
2021Acquisitions
Business Acquisition [Line Items]
Purchase price							57,000
Working capital acquired							7,700
Other net liabilities							3,000
Goodwill							16,900
Identifiable intangible assets							$ 35,400

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

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