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Goodwill and Intangible Assets (Changes in Carrying Amounts of Goodwill) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2022 USD ($)
Goodwill [Roll Forward]
Beginning balance	$ 1,531,455
Goodwill acquired	24,156
Purchase accounting adjustments	4,173
Foreign exchange translation	(2,706)
Ending balance	1,557,078
Operating Segments | Digital Media
Goodwill [Roll Forward]
Beginning balance	996,659
Goodwill acquired	24,156
Purchase accounting adjustments	2,139
Foreign exchange translation	(731)
Ending balance	1,022,223
Operating Segments | Cybersecurity and Martech
Goodwill [Roll Forward]
Beginning balance	534,796
Goodwill acquired	0
Purchase accounting adjustments	2,034
Foreign exchange translation	(1,975)
Ending balance	$ 534,855

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- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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