Segment Information Revenues By Region (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
Revenues from External Customers [Line Items]
Revenues	$ 579,140	$ 612,401	$ 1,150,780	$ 1,176,092
United States and Canada (Member)
Revenues from External Customers [Line Items]
Revenues	292,999	285,931	577,586	560,393
Europe, Middle East, and Africa (Member)
Revenues from External Customers [Line Items]
Revenues	215,899	250,709	436,855	474,412
OtherCountries [Member]
Revenues from External Customers [Line Items]
Revenues	$ 70,242	$ 75,761	$ 136,339	$ 141,287