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INDEBTEDNESS - Net Carrying Amount of Convertible Notes (Details) - Convertible Debt - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Nov. 13, 2020
Mar. 05, 2020
May 25, 2018
Mar. 06, 2017
Debt Instrument [Line Items]            
Principal outstanding $ 3,017,198 $ 3,021,045        
Unamortized debt discount   (405,163)        
Unamortized debt issuance costs (32,309) (28,958)        
Net carrying value 2,984,889 2,586,924        
2027 Notes            
Debt Instrument [Line Items]            
Principal outstanding 575,000 575,000        
Unamortized debt discount   (109,134)        
Unamortized debt issuance costs (8,790) (7,370)        
Net carrying value 566,210 458,496        
2026 Notes            
Debt Instrument [Line Items]            
Principal outstanding 575,000 575,000        
Unamortized debt discount   (85,085)        
Unamortized debt issuance costs (8,652) (7,711)        
Net carrying value 566,348 482,204        
2025 Notes            
Debt Instrument [Line Items]            
Principal outstanding 1,000,000 1,000,000        
Unamortized debt discount   (130,335)        
Unamortized debt issuance costs (11,918) (11,333) $ (15,400) $ (12,800)    
Net carrying value 988,082 858,332        
2023 Notes            
Debt Instrument [Line Items]            
Principal outstanding 862,500 862,500        
Unamortized debt discount   (79,980)        
Unamortized debt issuance costs (2,925) (2,474)     $ (5,600)  
Net carrying value 859,575 780,046        
2022 Notes            
Debt Instrument [Line Items]            
Principal outstanding 4,698 8,545        
Unamortized debt discount   (629)        
Unamortized debt issuance costs (24) (70)       $ (9,400)
Net carrying value $ 4,674 $ 7,846