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

 
$
143,750

Unamortized discount of liability component
(25,754
)
 
(22,895
)
Convertible Notes issuance costs, net of accumulated amortization of $858 and $1,233 respectively
$
(2,769
)
 
$
(2,394
)
Carrying value of the liability component
$
115,227

 
$
118,461

 
 
 
 
Equity component carrying value
$
17,973

 
$
17,973