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Convertible Notes (Details 2) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2011 | Sep. 30, 2010 | Sep. 30, 2011 | Sep. 30, 2010 | Dec. 31, 2010
Interest expense related to notes |  |  |  |  |
Total interest expense | $ 5,410 | $ 4,953 | $ 15,794 | $ 14,709 |
Zero Coupon Convertible Senior Notes due 2010 |  |  |  |  |
Interest expense related to notes |  |  |  |  |
Amortization of discount at an additional effective interest rate |  |  |  | 958 |
Effective interest rate (as a percent) | 8.40% | 8.40% | 8.40% | 8.40% |
5% Convertible Senior Notes due 2014 |  |  |  |  |
Interest expense related to notes |  |  |  |  |
2014 Notes coupon interest at a rate of 5% | 2,156 | 2,156 | 6,468 | 6,468 |
Amortization of discount at an additional effective interest rate | $ 3,254 | $ 2,797 | $ 9,326 | $ 7,283 |
Convertible notes stated interest rate (as a percent) | 5.00% |  | 5.00% |  | 5.00%
Effective interest rate (as a percent) | 11.70% | 11.70% | 11.70% | 11.70% |

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