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Convertible Notes (Details 2) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Interest expense related to notes          
2014 Notes amortization of discount and debt issuance costs at an additional effective interest rate of 11.7%     $ 8,234 $ 7,067  
Interest expense 7,426 6,719 14,738 13,299  
5% Convertible Senior Notes due 2014
          
Interest expense related to notes          
2014 Notes coupon interest at a rate of 5% 2,156 2,156 4,313 4,313  
2014 Notes amortization of discount and debt issuance costs at an additional effective interest rate of 11.7% 4,145 3,557 8,234 7,067  
Interest expense $ 6,301 $ 5,713 $ 12,547 $ 11,380  
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%