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Convertible Subordinated Notes (Tables)
 6 Months Ended
Jun. 30, 2015
Convertible Subordinated Notes [Abstract]  
Schedule of Liability and Equity Components of Convertible Subordinated Notes
The carrying values of the liability and equity components of the Notes at December 31, 2014 and June 30, 2015 are reflected in our Consolidated Balance Sheets as follows (in thousands):
 
December 31, 2014
 
June 30, 2015
Long-term liabilities:
 
 
 
Principal amount
$
143,750

 
$
143,750

Unamortized discount of liability component
(29,208
)
 
(27,530
)
Carrying value of the liability component
$
114,542

 
$
116,220

 
 
 
 
Equity component carrying value
$
17,973

 
$
17,973