Long-Term Obligations (Schedule Of Carrying Amount Of Convertible Senior Notes) (Details) (USD $) In Thousands | Sep. 30, 2011 | Dec. 31, 2010 |
|---|---|---|
| Debt Instrument [Line Items] | ||
| Total debt, net | $ 3,891,758 | $ 3,477,564 |
| Less current portion (2011 convertible senior notes) | 638,991 | |
| Total long-term debt, net | 3,891,758 | 2,838,573 |
2011 Convertible Senior Notes [Member] | ||
| Debt Instrument [Line Items] | ||
| Total debt, net | 638,991 | |
2013 Convertible Senior Notes [Member] | ||
| Debt Instrument [Line Items] | ||
| Total debt, net | 599,324 | 576,884 |
2014 Convertible Senior Notes [Member] | ||
| Debt Instrument [Line Items] | ||
| Total debt, net | 1,174,494 | 1,153,805 |
2016 Convertible Senior Notes [Member] | ||
| Debt Instrument [Line Items] | ||
| Total debt, net | 1,126,089 | 1,107,884 |
2021 Senior Unsecured Notes [Member] | ||
| Debt Instrument [Line Items] | ||
| Total debt, net | $ 991,851 |