Goodwill and Intangible Assets (Changes in Carrying Amounts of Goodwill) (Details) $ in Thousands	6 Months Ended
Jun. 30, 2023 USD ($)
Goodwill [Roll Forward]
Beginning balance	$ 1,591,474
Goodwill acquired	6,555
Purchase accounting adjustments	(72)
Foreign exchange translation	1,939
Ending balance	1,599,896
Operating Segments \| Digital Media
Goodwill [Roll Forward]
Beginning balance	1,065,989
Goodwill acquired	6,555
Purchase accounting adjustments	(72)
Foreign exchange translation	247
Ending balance	1,072,719
Operating Segments \| Cybersecurity and Martech
Goodwill [Roll Forward]
Beginning balance	525,485
Goodwill acquired	0
Purchase accounting adjustments	0
Foreign exchange translation	1,692
Ending balance	$ 527,177

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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