Segment Information Reportable Segment Information (Total Assets, Capital Expenditures, Depreciation And Amortization) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Segment Reporting, Other Significant Reconciling Item [Line Items]
Total assets	$ 2,304,686		$ 2,304,686		$ 2,062,328
Property, Plant and Equipment, Additions			29,483	$ 17,447
Depreciation, Depletion and Amortization, Nonproduction	39,372	$ 30,336	118,597	88,569
Business Cloud Services Segment [Member]
Segment Reporting, Other Significant Reconciling Item [Line Items]
Total assets	1,129,996		1,129,996		911,327
Property, Plant and Equipment, Additions			5,399	6,251
Depreciation, Depletion and Amortization, Nonproduction	17,145	20,218	51,097	58,971
Digital Media Segment [Member]
Segment Reporting, Other Significant Reconciling Item [Line Items]
Total assets	1,084,970		1,084,970		1,124,535
Property, Plant and Equipment, Additions			24,084	11,196
Depreciation, Depletion and Amortization, Nonproduction	22,227	10,118	67,500	29,598
Operating Segments [Member]
Segment Reporting, Other Significant Reconciling Item [Line Items]
Total assets	2,214,966		2,214,966		2,035,862
Property, Plant and Equipment, Additions			29,483	17,447
Depreciation, Depletion and Amortization, Nonproduction	39,372	30,336	118,597	88,569
Corporate [Member]
Segment Reporting, Other Significant Reconciling Item [Line Items]
Total assets	89,720		89,720		$ 26,466
Property, Plant and Equipment, Additions			0	0
Depreciation, Depletion and Amortization, Nonproduction	$ 0	$ 0	$ 0	$ 0