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DEBT - Future Payments of Principal and Contractual Interest (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Interest    
Interest expense, total due $ 17,238  
Convertible debt    
Principal    
2021 0  
2022 0  
2023 0  
2024 0  
2025 600,000  
Principal, total due 600,000 $ 600,000
Interest    
2021 2,250  
2022 4,500  
2023 4,500  
2024 4,500  
2025 1,488  
Total    
2021 2,250  
2022 4,500  
2023 4,500  
2024 4,500  
2025 601,488  
Principal and interest, total due $ 617,238