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Convertible Notes (Details 2) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Interest expense related to notes          
2014 Notes amortization of discount and debt issuance costs at an additional effective interest rate of 11.7%     $ 10,856 $ 9,326  
Total interest expense 7,121 6,350 20,420 18,462  
5% Convertible Senior Notes due 2014
          
Interest expense related to notes          
2014 Notes coupon interest at a rate of 5% 2,156 2,156 6,469 6,468  
2014 Notes amortization of discount and debt issuance costs at an additional effective interest rate of 11.7% 3,789 3,254 10,856 9,326  
Total interest expense $ 5,945 $ 5,410 $ 17,325 $ 15,794  
Convertible notes stated interest rate (as a percent) 5.00% 5.00% 5.00% 5.00% 5.00%
Effective interest rate (as a percent) 11.70% 11.70% 11.70% 11.70%