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Business Acquisitions (Narrative) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2023 USD ($)	Mar. 31, 2022 USD ($) subsidiary	Dec. 31, 2022 USD ($)	Jan. 21, 2022
Business Acquisition [Line Items]
Goodwill	$ 1,597,684		$ 1,591,474
Fiscal 2023 Acquisitions
Business Acquisition [Line Items]
Goodwill	3,800
Definite-lived intangible assets acquired	$ 4,200
Lifecycle Marketing Group Limited
Business Acquisition [Line Items]
Percentage of voting interests acquired				100.00%
Series of Individually Immaterial Business Acquisitions
Business Acquisition [Line Items]
Number of businesses acquired | subsidiary		2
Fiscal 2022 Acquisitions
Business Acquisition [Line Items]
Goodwill		$ 24,156
Revenue of acquiree since acquisition date		2,100
Total consideration of transactions		36,600
Fair value of accounts receivable acquired		4,600
Amount expected to be uncollectable		0
Expected income tax deductible amount		$ 2,200

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