Segment Information (Total Assets, Capital Expenditures, Depreciation and Amortization) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Segment Reporting, Other Significant Reconciling Item [Line Items]
Assets	$ 3,342,993		$ 3,342,993		$ 3,505,846
Capital expenditures			71,266	$ 49,483
Depreciation and amortization	59,612	$ 64,197	163,680	170,409
Operating Segments
Segment Reporting, Other Significant Reconciling Item [Line Items]
Assets	2,932,760		2,932,760		3,027,993
Capital expenditures			71,266	49,483
Depreciation and amortization	57,175	63,595	160,126	168,512
Corporate
Segment Reporting, Other Significant Reconciling Item [Line Items]
Assets	410,233		410,233		477,853
Capital expenditures			0	0
Depreciation and amortization	2,437	602	3,554	1,897
Cloud Services | Operating Segments
Segment Reporting, Other Significant Reconciling Item [Line Items]
Assets	1,481,866		1,481,866		1,466,969
Capital expenditures			27,673	17,216
Depreciation and amortization	20,524	24,605	58,355	58,445
Digital Media | Operating Segments
Segment Reporting, Other Significant Reconciling Item [Line Items]
Assets	1,450,894		1,450,894		$ 1,561,024
Capital expenditures			43,593	32,267
Depreciation and amortization	$ 36,651	$ 38,990	$ 101,771	$ 110,067