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Convertible Subordinated Notes (Tables)
 6 Months Ended
Jun. 30, 2016
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 Convertible Notes at December 31, 2015 and June 30, 2016 are reflected in our Consolidated Balance Sheets as follows (in thousands):
 
December 31, 2015
 
June 30, 2016
Long-term liabilities:
 
 
 
Principal amount
$
143,750

 
$
143,750

Unamortized discount of liability component
(25,754
)
 
(23,873
)
Convertible Notes issuance costs, net of accumulated amortization of $858 and $1,107 respectively
$
(2,769
)
 
$
(2,522
)
Carrying value of the liability component
$
115,227

 
$
117,355

 
 
 
 
Equity component carrying value
$
17,973

 
$
17,973