Goodwill And Intangible Assets (Changes In Carrying Amounts Of Goodwill And Other Intangible Assets) (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2016 USD ($)
Goodwill [Line Items]
Balance as of January 1, 2016	$ 807,661
Goodwill, Acquired During Period	43,542
Goodwill, Purchase Accounting Adjustments	(4,518)
Foreign Exchange Translation	(5,739)
Balance as of June 30, 2016	840,946
Business Cloud Services Segment [Member]
Goodwill [Line Items]
Balance as of January 1, 2016	502,718
Goodwill, Acquired During Period	43,542
Goodwill, Purchase Accounting Adjustments	612
Foreign Exchange Translation	(5,624)
Balance as of June 30, 2016	541,248
Digital Media Segment [Member]
Goodwill [Line Items]
Balance as of January 1, 2016	304,943
Goodwill, Acquired During Period	0
Goodwill, Purchase Accounting Adjustments	(5,130)
Foreign Exchange Translation	(115)
Balance as of June 30, 2016	$ 299,698