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Senior convertible notes (Tables)
 6 Months Ended
Jun. 30, 2014
Summary of Senior Convertible Notes

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

 

     June 30,
2014		     December 31,
2013		  

2015 notes

     

Principal amount

    $ 100,000      $ 100,000   

Unaccreted debt issuance expense

      (1,111 )      (1,561 ) 
  

 

 

    

 

 

  

Net carrying amount

    $ 98,889      $ 98,439   
  

 

 

    

 

 

  
Accretion of Debt Issuance Expense

Accretion of debt issuance expense in connection with the 2015 notes during the three and six months ended June 30, 2014 and 2013 were as follows (in thousands):

 

     Three months ended
June 30,		      Six months ended
June 30,		  
     2014      2013      2014      2013  

Accretion expense

    $ 227       $ 212       $ 450       $ 421