Goodwill And Intangible Assets (Changes In Carrying Amounts Of Goodwill And Other Intangible Assets) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2016 USD ($)
Goodwill [Line Items]
Balance as of January 1, 2016	$ 807,661
Goodwill, Acquired During Period	24,876
Goodwill, Purchase Accounting Adjustments	(5,533)
Foreign Exchange Translation	2,008
Balance as of March 31, 2016	829,012
Business Cloud Services Segment [Member]
Goodwill [Line Items]
Balance as of January 1, 2016	502,718
Goodwill, Acquired During Period	24,876
Goodwill, Purchase Accounting Adjustments	612
Foreign Exchange Translation	1,948
Balance as of March 31, 2016	530,154
Digital Media Segment [Member]
Goodwill [Line Items]
Balance as of January 1, 2016	304,943
Goodwill, Acquired During Period	0
Goodwill, Purchase Accounting Adjustments	(6,145)
Foreign Exchange Translation	60
Balance as of March 31, 2016	$ 298,858