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Segment Information (Total Assets, Capital Expenditures, Depreciation and Amortization) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Segment Reporting, Other Significant Reconciling Item [Line Items]
Assets	$ 3,703,657		$ 3,665,331
Capital expenditures	26,269	$ 26,885
Depreciation and amortization	65,492	53,980
Disposal Group, Held-for-sale, Not Discontinued Operations | B2B Backup Business
Segment Reporting, Other Significant Reconciling Item [Line Items]
Assets held for sale	135,654
Operating Segments
Segment Reporting, Other Significant Reconciling Item [Line Items]
Assets	3,507,460		3,561,795
Capital expenditures	26,269	26,885
Depreciation and amortization	65,397	53,395
Corporate
Segment Reporting, Other Significant Reconciling Item [Line Items]
Assets	196,197		103,536
Capital expenditures	0	0
Depreciation and amortization	95	585
Digital Media | Operating Segments
Segment Reporting, Other Significant Reconciling Item [Line Items]
Assets	1,975,836		2,088,397
Capital expenditures	16,819	15,637
Depreciation and amortization	48,350	32,556
Cloud Services | Operating Segments
Segment Reporting, Other Significant Reconciling Item [Line Items]
Assets	1,531,624		$ 1,473,398
Capital expenditures	9,450	11,248
Depreciation and amortization	$ 17,047	$ 20,839

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