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Goodwill and Intangible Assets (Changes in Carrying Amounts of Goodwill) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Goodwill [Roll Forward]
Beginning balance			$ 1,591,474
Goodwill acquired			6,258
Goodwill impairment	$ (56,850)	$ (27,369)	(56,850)	$ (27,369)
Purchase accounting adjustments			(72)
Foreign exchange translation			(1,147)
Ending balance	1,539,663		1,539,663		$ 1,591,474
Digital Media
Goodwill [Roll Forward]
Goodwill impairment			(84,200)		(27,400)
Operating Segments | Digital Media
Goodwill [Roll Forward]
Beginning balance			1,065,989
Goodwill acquired			6,258
Goodwill impairment	(56,900)	$ (27,400)	(56,850)	$ (27,400)
Purchase accounting adjustments			(72)
Foreign exchange translation			(644)
Ending balance	1,014,681		1,014,681		1,065,989
Operating Segments | Cybersecurity and Martech
Goodwill [Roll Forward]
Beginning balance			525,485
Goodwill acquired			0
Goodwill impairment			0
Purchase accounting adjustments			0
Foreign exchange translation			(503)
Ending balance	$ 524,982		$ 524,982		$ 525,485

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