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Segment Information (Total Assets, Capital Expenditures, Depreciation and Amortization) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Segment Reporting, Other Significant Reconciling Item [Line Items]
Assets:	$ 3,663,171		$ 3,770,280
Capital expenditures	30,502	$ 26,269
Depreciation and amortization:	59,071	65,492
Reportable segments
Segment Reporting, Other Significant Reconciling Item [Line Items]
Assets:	3,035,792		3,131,945
Capital expenditures	30,502	26,269
Depreciation and amortization:	58,978	65,397
Corporate
Segment Reporting, Other Significant Reconciling Item [Line Items]
Assets:	627,379		638,335
Capital expenditures	0	0
Depreciation and amortization:	93	95
Digital Media | Reportable segments
Segment Reporting, Other Significant Reconciling Item [Line Items]
Assets:	1,985,271		2,043,204
Capital expenditures	26,931	16,819
Depreciation and amortization:	46,121	48,350
Cybersecurity and Martech | Reportable segments
Segment Reporting, Other Significant Reconciling Item [Line Items]
Assets:	1,050,521		$ 1,088,741
Capital expenditures	3,571	9,450
Depreciation and amortization:	$ 12,857	$ 17,047

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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