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Debt (Tables)
12 Months Ended
Dec. 31, 2012
Debt [Abstract]  
Interest expense on convertible notes
                         
    December 31,
2012
    December 31,
2011
    December 31,
2010
 

Interest expense at coupon rate (6.0%)

  $ 2,756     $ 5,726     $ 5,850  

Non-cash interest in accordance with ASC 470-20

    5,450       10,538       8,149  
   

 

 

   

 

 

   

 

 

 

Total interest expense recognized on convertible debt instruments

  $ 8,206     $ 16,264     $ 13,999  
   

 

 

   

 

 

   

 

 

 
Summary of Long-term debt
                 
    2012     2011  

Convertible notes

  $ —       $ 91,875  

Less unamortized debt discount

    —         (5,450
   

 

 

   

 

 

 
      —         86,425  

Less current portion

    —         (86,425
   

 

 

   

 

 

 

Long-term debt, excluding current portion

  $ —       $ —