Segment Information Revenues By Region (Details) (USD $) In Thousands | 3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2011 | Sep. 30, 2010 | Sep. 30, 2011 | Sep. 30, 2010 | |
| Revenues from External Customers [Line Items] | ||||
| Revenues | $ 615,555 | $ 573,651 | $ 1,791,647 | $ 1,638,613 |
United States and Canada (Member) | ||||
| Revenues from External Customers [Line Items] | ||||
| Revenues | 292,323 | 310,671 | 852,715 | 849,174 |
Europe (Member) | ||||
| Revenues from External Customers [Line Items] | ||||
| Revenues | 207,645 | 173,936 | 638,830 | 562,284 |
Other Countries [Member] | ||||
| Revenues from External Customers [Line Items] | ||||
| Revenues | $ 115,587 | $ 89,044 | $ 300,102 | $ 227,155 |