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Long-Term Obligations (Schedule Of Information About Equity And Liability Components Of Convertible Senior Notes 2014 And 2016 Notes) (Details) (USD $)
In Thousands, unless otherwise specified |
Dec. 31, 2011
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Dec. 31, 2010
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|---|---|---|
| Debt Instrument [Line Items] | ||
| Carrying Value of Equity Component | $ 255,517 | |
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May 2014 Convertible Senior Notes [Member]
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| Debt Instrument [Line Items] | ||
| Carrying Value of Equity Component | 107,496 | 107,496 |
| Net carrying amount of liability component | 1,181,525 | 1,153,805 |
| Unamortized Discount of Liability Component | (68,475) | (96,195) |
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May 2016 Convertible Senior Notes [Member]
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| Debt Instrument [Line Items] | ||
| Carrying Value of Equity Component | 152,039 | 152,039 |
| Net carrying amount of liability component | 1,132,293 | 1,107,884 |
| Unamortized Discount of Liability Component | (117,707) | (142,116) |
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Total May 2014 And 2016 Convertible Senior Notes [Member]
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| Debt Instrument [Line Items] | ||
| Carrying Value of Equity Component | 259,535 | 259,535 |
| Net carrying amount of liability component | 2,313,818 | 2,261,689 |
| Unamortized Discount of Liability Component | $ (186,182) | $ (238,311) |