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Senior convertible notes (Tables)
 9 Months Ended
Sep. 30, 2013
Summary of Senior Convertible Notes

Senior convertible notes consist of the following (in thousands):

 

     September 30,
2013		     December 31,
2012		  

2013 notes

     

Principal amount

    $ 115,000      $ 115,000   

Unaccreted debt issuance expense

      (103 )      (557 ) 
  

 

 

    

 

 

  

Net carrying amount

      114,897        114,443   
  

 

 

    

 

 

  

2015 notes

     

Principal amount

    $ 100,000      $ 100,000   

Unaccreted debt issuance expense

      (1,780 )      (2,417 ) 
  

 

 

    

 

 

  

Net carrying amount

      98,220        97,583   
  

 

 

    

 

 

  

Senior convertible notes

    $ 213,117      $ 212,026   
  

 

 

    

 

 

  
Accretion of Debt Issuance Expense

Accretion of debt issuance expense in connection with the offerings of the 2015 notes and the 2013 notes during the three and nine months ended September 30, 2013 were as follows (in thousands).

 

     Three months  ended
September 30,		      Nine months  ended
September 30,		  
     2013      2012      2013      2012  

Accretion expense

    $ 369       $ 348       $ 1,091       $ 1,031