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Segment Information (Total Assets, Capital Expenditures, Depreciation and Amortization) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Segment Reporting, Other Significant Reconciling Item [Line Items]
Assets	$ 3,703,366		$ 3,703,366		$ 3,665,331
Capital expenditures			57,766	$ 50,537
Depreciation and amortization	64,736	$ 50,088	130,226	104,068
Disposal Group, Held-for-sale, Not Discontinued Operations | B2B Backup Business
Segment Reporting, Other Significant Reconciling Item [Line Items]
Assets held for sale	107,126		107,126
Operating Segments
Segment Reporting, Other Significant Reconciling Item [Line Items]
Assets	3,534,637		3,534,637		3,561,795
Capital expenditures			57,766	50,537
Depreciation and amortization	64,691	49,557	130,088	102,951
Corporate
Segment Reporting, Other Significant Reconciling Item [Line Items]
Assets	168,729		168,729		103,536
Capital expenditures			0	0
Depreciation and amortization	45	531	138	1,117
Digital Media | Operating Segments
Segment Reporting, Other Significant Reconciling Item [Line Items]
Assets	1,957,615		1,957,615		2,088,397
Capital expenditures			38,047	29,441
Depreciation and amortization	49,076	32,565	97,426	65,120
Cloud Services | Operating Segments
Segment Reporting, Other Significant Reconciling Item [Line Items]
Assets	1,577,022		1,577,022		$ 1,473,398
Capital expenditures			19,719	21,096
Depreciation and amortization	$ 15,615	$ 16,992	$ 32,662	$ 37,831

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