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Long-Term Debt
 6 Months Ended
Jun. 30, 2020
Debt Disclosure [Abstract]  
Long-Term Debt Long-Term Debt
Long-term debt is summarized as follows:
 
 
June 30, 2020
 
December 31, 2019
Principal amount of 4.50% exchangeable senior notes due 2023
 
$
143,750

 
$
143,750

Less: unamortized debt discount and issuance costs, net
 
(18,871
)
 
(22,064
)
Net carrying amount of liability component
 
124,879

 
121,686

Less: current maturities
 
—

 
—

     Long-term debt
 
$
124,879

 
$
121,686

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