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Long-Term Debt (Tables)
 3 Months Ended
Mar. 31, 2019
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments
Debt consists of the following (in thousands):
 
March 31, 2019
 
December 31, 2018
Convertible senior notes at 5.00%, due in February 2021
$
132,345

 
$
130,260

Convertible senior notes at 4.50%, due in June 2022
97,011

 
95,473

Long-Term Debt
$
229,356

 
$
225,733
Liability Components of Convertible 2021 Note
The liability components of the 2021 notes consist of the following (in thousands):
 
March 31, 2019
 
December 31, 2018
Principal amount of liability component
$
150,000

 
$
150,000

Unamortized discount
(15,408
)
 
(17,193
)
Debt fees
(2,247
)
 
(2,547
)
Net carrying amount of liability component
$
132,345

 
$
130,260
Liability Components of Convertible 2022 Note
The liability components of the 2022 notes consist of the following (in thousands):
 
March 31, 2019
 
December 31, 2018
Principal amount of liability component
$
120,000

 
$
120,000

Unamortized discount
(20,161
)
 
(21,476
)
Debt fees
(2,828
)
 
(3,051
)
Net carrying amount of liability component
$
97,011

 
$
95,473