Segment Information Revenues By Region (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Revenues from External Customers [Line Items]
Revenues	$ 504,063	$ 615,555	$ 1,654,843	$ 1,791,647
United States and Canada (Member)
Revenues from External Customers [Line Items]
Revenues	224,956	292,322	802,542	852,715
Europe, Middle East, and Africa (Member)
Revenues from External Customers [Line Items]
Revenues	211,195	227,884	648,050	702,296
OtherCountries [Member]
Revenues from External Customers [Line Items]
Revenues	$ 67,912	$ 95,349	$ 204,251	$ 236,636