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Long Term Debt (Tables)
3 Months Ended
Mar. 31, 2015
Long-term Debt, Unclassified [Abstract]  
Schedule of Long-term Debt Instruments [Table Text Block]
Long-term debt as of March 31, 2015 consists of the following (in thousands):
 
Senior Notes
$
246,324

Convertible Notes
348,942

Total long-term debt
595,266

Less: current portion

Total long-term debt, less current portion
$
595,266