Segment Information Revenues By Region (Details) (USD $) In Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Revenues from External Customers [Line Items]
Revenues	$ 615,555	$ 573,651	$ 1,791,647	$ 1,638,613
United States and Canada (Member)
Revenues from External Customers [Line Items]
Revenues	292,323	310,671	852,715	849,174
Europe (Member)
Revenues from External Customers [Line Items]
Revenues	207,645	173,936	638,830	562,284
Other Countries [Member]
Revenues from External Customers [Line Items]
Revenues	$ 115,587	$ 89,044	$ 300,102	$ 227,155