Segment Information Reportable Segment Information (Total Assets, Capital Expenditures, Depreciation And Amortization) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Segment Reporting, Other Significant Reconciling Item [Line Items]
Total assets	$ 3,368,893		$ 3,505,846
Property, Plant and Equipment, Additions	26,885	$ 12,531
Depreciation, Depletion and Amortization, Nonproduction	53,980	49,209
Cloud Services Segment [Member]
Segment Reporting, Other Significant Reconciling Item [Line Items]
Total assets	1,405,497		1,466,969
Property, Plant and Equipment, Additions	11,248	3,502
Depreciation, Depletion and Amortization, Nonproduction	20,839	13,349
Digital Media Segment [Member]
Segment Reporting, Other Significant Reconciling Item [Line Items]
Total assets	1,462,212		1,561,024
Property, Plant and Equipment, Additions	15,637	9,029
Depreciation, Depletion and Amortization, Nonproduction	32,556	35,179
Operating Segments [Member]
Segment Reporting, Other Significant Reconciling Item [Line Items]
Total assets	2,867,709		3,027,993
Property, Plant and Equipment, Additions	26,885	12,531
Depreciation, Depletion and Amortization, Nonproduction	53,395	48,528
Corporate [Member]
Segment Reporting, Other Significant Reconciling Item [Line Items]
Total assets	501,184		$ 477,853
Property, Plant and Equipment, Additions	0	0
Depreciation, Depletion and Amortization, Nonproduction	$ 585	$ 681