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Long Term Debt (Tables)
9 Months Ended
Sep. 30, 2015
Long-term Debt, Unclassified [Abstract]  
Schedule of Long-term Debt Instruments [Table Text Block]
Long-term debt as of September 30, 2015 consists of the following (in thousands):
 
Senior Notes
$
246,605

Convertible Notes
352,578

Total long-term debt
599,183

Less: current portion

Total long-term debt, less current portion
$
599,183