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Long-Term Debt - (Tables)
12 Months Ended
Dec. 31, 2018
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments
Long-Term debt is summarized as follows:
 
 
December 31, 2018
 
December 31, 2017
Principal amount of 4.50% exchangeable senior notes due 2023
 
$
143,750

 
$

Less: unamortized debt discount and issuance costs, net
 
(28,059
)
 

Net carrying amount of liability component
 
115,691

 

Other debt
 
149

 
267

     Subtotal
 
115,840

 
267

Less: current maturities
 
(106
)
 
(111
)
     Long-term debt
 
$
115,734

 
$
156

 
 
 
 
 
Equity component:
 
 
 
 
Equity component of exchangeable notes, net of issuance costs
 
$
(26,699
)
 
$