Segment Information (Revenues By Geographic Location) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Net revenues	$ 615,210	$ 530,790	$ 1,204,705	$ 1,021,678
Enterprise Divisions [Member]
Net revenues	489,700	424,311	958,462	815,427
Enterprise Divisions [Member] | Americas [Member]
Net revenues	259,769	235,003	512,252	452,475
Enterprise Divisions [Member] | EMEA [Member]
Net revenues	163,976	135,949	324,047	269,322
Enterprise Divisions [Member] | Asia-Pacific [Member]
Net revenues	65,955	53,359	122,163	93,630
Online Services Division [Member]
Net revenues	125,510	106,479	246,243	206,251
Online Services Division [Member] | Americas [Member]
Net revenues	106,784	90,660	210,011	178,950
Online Services Division [Member] | EMEA [Member]
Net revenues	15,578	13,434	30,033	22,721
Online Services Division [Member] | Asia-Pacific [Member]
Net revenues	$ 3,148	$ 2,385	$ 6,199	$ 4,580