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Long-Term Obligations (Schedule Of Information About Equity And Liability Components Of Convertible Senior Notes 2011 And 2013 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 2011 Convertible Senior Notes [Member]
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| Debt Instrument [Line Items] | ||
| Carrying Value of Equity Component | 0 | 147,481 |
| Net Carrying Amount of Liability Component | 0 | 638,991 |
| Unamortized Discount of Liability Component | 0 | (10,996) |
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May 2013 Convertible Senior Notes [Member]
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| Debt Instrument [Line Items] | ||
| Carrying Value of Equity Component | 193,231 | 193,231 |
| Net Carrying Amount of Liability Component | 607,036 | 576,884 |
| Unamortized Discount of Liability Component | (42,831) | (72,983) |
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Total May 2011 And 2013 Convertible Senior Notes [Member]
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| Debt Instrument [Line Items] | ||
| Carrying Value of Equity Component | 193,231 | 340,712 |
| Net Carrying Amount of Liability Component | 607,036 | 1,215,875 |
| Unamortized Discount of Liability Component | $ (42,831) | $ (83,979) |