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Borrowings (Tables)
 12 Months Ended
Dec. 31, 2013
Debt Disclosure [Abstract]  
Schedule of Future Minimum Payments under the Loans Payable

Future minimum payments under indebtedness agreements outstanding as of December 31, 2013 are as follows:

 

Years Ending December 31:

(in thousands)

    4.50% Convertible
Senior Notes		     Loan
Agreement		  

2014

    $ 5,594      $ 12,353   

2015

      5,625        18,130   

2016

      5,625        17,916   

2017

      5,625        —     

2018 and thereafter

      141,875        —     
  

 

 

    

 

 

  
   $ 164,344      $ 48,399   

Less interest

      (39,344 )      (7,199 ) 

Less unamortized discount

      (52,422 )      (2,103 ) 

Less current portion

      —          (8,248 ) 
  

 

 

    

 

 

  

Loans payable, net of current portion

    $ 72,578      $ 30,849