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Goodwill and Intangible Assets (Narrative) (Details) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2022 USD ($) reportingUnit	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) reportingUnit	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)
Finite-Lived Intangible Assets [Line Items]
Goodwill impairment on business	$ 27,369	$ 0	$ 27,369	$ 32,629
Goodwill	1,579,957		1,579,957		$ 1,531,455
Amortization expense	36,300	$ 46,600	$ 119,300	$ 140,700
Digital Media
Finite-Lived Intangible Assets [Line Items]
Number of reporting units | reportingUnit			7
Goodwill impairment on business			$ 27,400		0
Cybersecurity and Martech
Finite-Lived Intangible Assets [Line Items]
Number of reporting units | reportingUnit			2
Goodwill impairment on business			$ 32,600		32,600
Operating Segments | Digital Media
Finite-Lived Intangible Assets [Line Items]
Goodwill impairment on business	27,400		27,369
Goodwill	$ 1,062,108		1,062,108		996,659
Operating Segments | Digital Media | Digital Media Subsegment
Finite-Lived Intangible Assets [Line Items]
Number of reporting units | reportingUnit	2
Goodwill	$ 86,900		86,900
Operating Segments | Cybersecurity and Martech
Finite-Lived Intangible Assets [Line Items]
Goodwill impairment on business			0
Goodwill	$ 517,849		$ 517,849		$ 534,796
Minimum
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life			1 year
Maximum
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life			20 years

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