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Long-Term Debt (Tables)
 3 Months Ended
Mar. 31, 2020
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments
Debt consists of the following (in thousands):
 
March 31, 2020
 
December 31, 2019
Convertible senior notes at 5.00%, due in February 2021
$
57,573

 
$
56,628

Convertible senior notes at 4.50%, due in June 2022
103,499

 
101,815

Convertible senior notes at 5.00%, due in November 2024
61,325

 
60,817

Other obligations
21,846

 
262

 
244,243

 
219,522

Less current maturities of long-term debt
(79,217
)
 
(58
)
Long-Term Debt
$
165,026

 
$
219,464
Liability Components of Convertible 2021 Note
The liability components of the 2021 notes consist of the following (in thousands):
 
March 31, 2020
 
December 31, 2019
Principal amount of liability component
$
61,091

 
$
61,091

Unamortized discount
(3,092
)
 
(3,916
)
Debt fees
(426
)
 
(547
)
Net carrying amount of liability component
$
57,573

 
$
56,628
Liability Components of Convertible 2022 Note
The liability components of the 2022 notes consist of the following (in thousands):
 
March 31, 2020
 
December 31, 2019
Principal amount of liability component
$
120,000

 
$
120,000

Unamortized discount
(14,566
)
 
(16,027
)
Debt fees
(1,935
)
 
(2,158
)
Net carrying amount of liability component
$
103,499

 
$
101,815
Liability Components of Convertible 2024 Note The liability components of the 2024 notes consist of the following (in thousands):
 
March 31, 2020
 
December 31, 2019
Principal amount of liability component
$
72,909

 
$
72,909

Unamortized discount
(10,285
)
 
(10,733
)
Debt fees
(1,299
)
 
(1,359
)
Net carrying amount of liability component
$
61,325

 
$
60,817