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Interest Costs (Tables)
 9 Months Ended
Sep. 30, 2017
Text Block [Abstract]  
Summary of Interest Costs

The following is a summary of our interest costs for the three and nine month periods ended September 30, 2017 and 2016 (in thousands):

 

     For the Three Months      For the Nine Months  
     Ended September 30,      Ended September 30,  
     2017      2016      2017      2016  

Interest costs charged to expense

    $ 21,936      $ 19,598      $ 65,164      $ 42,780  

Amortization of deferred financing costs

      919        818        2,718        2,981  

Accretion of debt discount on Convertible Notes

      4,945        4,432        14,438        12,940  

Amortization of debt premium on Senior Secured Notes

      (215 )       —          (566 )       —    
  

 

 

     

 

 

     

 

 

     

 

 

  

Interest expense

      27,585        24,848        81,754        58,701  

Interest costs capitalized to property and equipment

      9        34        15        187  

Interest costs capitalized to software

      193        279        804        961  
  

 

 

     

 

 

     

 

 

     

 

 

  

Total interest costs

    $ 27,787      $ 25,161      $ 82,573      $ 59,849