Business Segments (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Revenues from external customer and long lived assets by geographical areas
Revenues	$ 3,927,158	$ 3,360,984	$ 2,778,990
Long-Lived Assets	969,103	852,442	850,971
United States [Member]
Revenues from external customer and long lived assets by geographical areas
Revenues	2,694,870	2,305,020	1,889,829
Long-Lived Assets	499,753	460,362	458,722
PRC [Member]
Revenues from external customer and long lived assets by geographical areas
Revenues	833,146	727,758	588,136
Long-Lived Assets	354,351	347,999	343,228
Rest of world [Member]
Revenues from external customer and long lived assets by geographical areas
Revenues	399,142	328,206	301,025
Long-Lived Assets	$ 114,999	$ 44,081	$ 49,021