Segment Information Revenues By Region (Details) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Revenues from External Customers [Line Items]
Revenues	$ 612,401	$ 567,339	$ 1,176,092	$ 1,064,962
United States and Canada (Member)
Revenues from External Customers [Line Items]
Revenues	285,931	299,502	560,393	538,502
Europe (Member)
Revenues from External Customers [Line Items]
Revenues	228,354	192,864	431,185	388,348
Other Countries [Member]
Revenues from External Customers [Line Items]
Revenues	$ 98,116	$ 74,973	$ 184,514	$ 138,112