Segment Information Revenues By Region (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Revenues from External Customers [Line Items]
Total revenues	$ 2,178,178	$ 2,434,124	$ 2,259,271
United States and Canada (Member)
Revenues from External Customers [Line Items]
Total revenues	1,014,739	1,182,775	1,168,523
Europe, Middle East, and Africa (Member)
Revenues from External Customers [Line Items]
Total revenues	878,615	899,642	803,154
Other Countries [Member]
Revenues from External Customers [Line Items]
Total revenues	$ 284,824	$ 351,707	$ 287,594