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Long-Term Debt (Tables)
 9 Months Ended
Sep. 30, 2016
Debt Disclosure [Abstract]  
Summary of Long-term Debt

The following table summarizes the Company’s long-term debt:

 

     September 30,      December 31,  
     2016      2015  

8% Senior Notes, due January 30, 2020

    $ 40,250       $ 40,250   

3.875% Convertible Senior Notes, due March 15, 2019

      89,990         103,000   

4% Promissory note, due through February 1, 2031

      8,936         —     

3.75% Promissory note, due through September 1, 2036

      9,000         —     
  

 

 

     

 

 

  

Total principal amount

      148,176         143,250   

Less: unamortized discount and issuance costs

      (10,004 )       (13,821 ) 
  

 

 

     

 

 

  

Total long-term debt

    $ 138,172       $ 129,429   
  

 

 

     

 

 

  
Summary of Future Maturities of Long-Term Debt

As of September 30, 2016, future maturities of long-term debt are as follows:

 

Due in 12 months following September 30,

   

2016

    $ 776   

2017

      807   

2018

      90,829   

2019

      41,122   

2020

      906   

Thereafter

      13,736   
  

 

 

  

Total

    $ 148,176   
  

 

 

  
Schedule of Interest Expense

Information with respect to interest expense is as follows:

 

     Three Months Ended      Nine Months Ended  
     September 30,      September 30,  
     2016      2015      2016      2015  

Interest Expense:

            

Contractual interest

    $ 1,810       $ 1,802       $ 5,466       $ 5,408   

Non-cash expense*

      862         896         2,646         2,630   
  

 

 

     

 

 

     

 

 

     

 

 

  
   $ 2,672       $ 2,698       $ 8,112       $ 8,038   
  

 

 

     

 

 

     

 

 

     

 

 

  

 

* Includes amortization of debt discount and issuance costs.