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Goodwill and Intangible Assets (Changes in Carrying Amounts of Goodwill) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Goodwill [Line Items]
Beginning balance			$ 1,546,065
Goodwill acquired			112,534
Goodwill removed due to sale of businesses			(3,983)
Goodwill impairment	$ (85,273)	$ (56,850)	(85,273)	$ (56,850)
Foreign exchange translation			3,511
Ending balance	1,572,854		1,572,854
Digital Media
Goodwill [Line Items]
Goodwill impairment	(85,300)	$ (56,900)	(85,300)	$ (56,900)
Operating Segments | Digital Media
Goodwill [Line Items]
Beginning balance			1,016,880
Goodwill acquired			112,534
Goodwill removed due to sale of businesses			(3,983)
Goodwill impairment			(85,273)
Foreign exchange translation			1,180
Ending balance	1,041,338		1,041,338
Operating Segments | Cybersecurity and Martech
Goodwill [Line Items]
Beginning balance			529,185
Goodwill acquired			0
Goodwill removed due to sale of businesses			0
Goodwill impairment			0
Foreign exchange translation			2,331
Ending balance	$ 531,516		$ 531,516

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