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Segment Information (Total Assets, Capital Expenditures, Depreciation and Amortization) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Segment Reporting, Other Significant Reconciling Item [Line Items]
Assets	$ 3,830,657		$ 3,830,657		$ 3,665,331
Capital expenditures			87,495	$ 71,266
Depreciation and amortization	66,217	$ 59,612	196,443	163,680
Operating Segments
Segment Reporting, Other Significant Reconciling Item [Line Items]
Assets	3,545,371		3,545,371		3,561,795
Capital expenditures			87,495	71,266
Depreciation and amortization	66,138	57,175	196,226	160,126
Corporate
Segment Reporting, Other Significant Reconciling Item [Line Items]
Assets	285,286		285,286		103,536
Capital expenditures			0	0
Depreciation and amortization	79	2,437	217	3,554
Digital Media | Operating Segments
Segment Reporting, Other Significant Reconciling Item [Line Items]
Assets	1,978,252		1,978,252		2,088,397
Capital expenditures			51,995	43,593
Depreciation and amortization	50,056	36,651	147,482	101,771
Cloud Services | Operating Segments
Segment Reporting, Other Significant Reconciling Item [Line Items]
Assets	1,567,119		1,567,119		$ 1,473,398
Capital expenditures			35,500	27,673
Depreciation and amortization	$ 16,082	$ 20,524	$ 48,744	$ 58,355

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