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Long-Term Debt (Tables)
 6 Months Ended
Jun. 30, 2020
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments
Debt consists of the following (in thousands):
June 30, 2020December 31, 2019
Convertible senior notes at 5.00%, due in February 2021$24,644  $56,628  
Convertible senior notes at 4.50%, due in June 202271,454  101,815  
Convertible senior notes at 5.00%, due in November 202461,908  60,817  
Series II Convertible senior notes at 5.00%, due November 202462,175  —  
Other obligations36,945  262  
257,126  219,522  
Less current maturities of long-term debt(52,968) (58) 
Long-Term Debt$204,158  $219,464  
Liability Components of Convertible 2021 Note
The liability components of the 2021 notes consist of the following (in thousands):
June 30, 2020December 31, 2019
Principal amount of liability component$25,716  $61,091  
Unamortized discount(944) (3,916) 
Debt fees(128) (547) 
Net carrying amount of liability component$24,644  $56,628  
Liability Components of Convertible 2022 Note
The liability components of the 2022 notes consist of the following (in thousands):
June 30, 2020December 31, 2019
Principal amount of liability component$81,500  $120,000  
Unamortized discount(8,883) (16,027) 
Debt fees(1,163) (2,158) 
Net carrying amount of liability component$71,454  $101,815  
Liability Components of Convertible 2024 Note
The liability components of the 2024 notes consist of the following (in thousands):
June 30, 2020December 31, 2019
Principal amount of liability component$72,909  $72,909  
Unamortized discount(9,831) (10,733) 
Debt fees(1,170) (1,359) 
Net carrying amount of liability component$61,908  $60,817  
Liability Components of Convertible Series II 2024 Note
The liability components of the Series II Notes consist of the following (in thousands):
June 30, 2020
Principal amount of liability component - including accretion$74,129  
Unamortized discount(10,465) 
Debt fees(1,489) 
Net carrying amount of liability component$62,175