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Convertible Notes (Details 2) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 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% $ 4,089 $ 3,510  
Total interest expense 7,312 6,580  
5% Convertible Senior Notes due 2014
      
Interest expense related to notes      
2014 Notes coupon interest at a rate of 5% 2,157 2,157  
2014 Notes amortization of discount and debt issuance costs at an additional effective interest rate of 11.7% 4,089 3,510  
Total interest expense $ 6,246 $ 5,667  
Convertible notes stated interest rate (as a percent) 5.00% 5.00% 5.00%
Effective interest rate (as a percent) 11.70% 11.70%