Goodwill And Intangible Assets (Changes In Carrying Amounts Of Goodwill And Other Intangible Assets) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Goodwill [Roll Forward]
Beginning balance	$ 807,661	$ 635,675
Goodwill acquired	333,190	172,593	$ 184,837
Purchase Accounting Adjustments	(4,141)	6,611
Foreign exchange translation	(13,900)	(7,218)
Ending balance	1,122,810	807,661	635,675
Business Cloud Services
Goodwill [Roll Forward]
Beginning balance	502,718	390,063
Goodwill acquired	69,202	108,913
Purchase Accounting Adjustments	816	10,900
Foreign exchange translation	(13,584)	(7,158)
Ending balance	559,152	502,718	390,063
Digital Media
Goodwill [Roll Forward]
Beginning balance	304,943	245,612
Goodwill acquired	263,988	63,680
Purchase Accounting Adjustments	(4,957)	(4,289)
Foreign exchange translation	(316)	(60)
Ending balance	$ 563,658	$ 304,943	$ 245,612