Segment Information Reportable Segment Information (Total Assets, Capital Expenditures, Depreciation And Amortization) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Segment Reporting, Other Significant Reconciling Item [Line Items]
Total assets	$ 3,419,445		$ 3,419,445		$ 3,505,846
Property, Plant and Equipment, Additions			50,537	$ 30,791
Depreciation, Depletion and Amortization, Nonproduction	50,088	$ 57,003	104,068	106,212
Cloud Services Segment [Member]
Segment Reporting, Other Significant Reconciling Item [Line Items]
Total assets	1,477,190		1,477,190		1,466,969
Property, Plant and Equipment, Additions			21,096	9,605
Depreciation, Depletion and Amortization, Nonproduction	16,992	20,492	37,831	33,841
Digital Media Segment [Member]
Segment Reporting, Other Significant Reconciling Item [Line Items]
Total assets	1,433,537		1,433,537		1,561,024
Property, Plant and Equipment, Additions			29,441	21,186
Depreciation, Depletion and Amortization, Nonproduction	32,565	35,898	65,120	71,077
Operating Segments [Member]
Segment Reporting, Other Significant Reconciling Item [Line Items]
Total assets	2,910,727		2,910,727		3,027,993
Property, Plant and Equipment, Additions			50,537	30,791
Depreciation, Depletion and Amortization, Nonproduction	49,557	56,390	102,951	104,918
Corporate [Member]
Segment Reporting, Other Significant Reconciling Item [Line Items]
Total assets	508,718		508,718		$ 477,853
Property, Plant and Equipment, Additions			0	0
Depreciation, Depletion and Amortization, Nonproduction	$ 531	$ 613	$ 1,117	$ 1,294