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INDEBTEDNESS - Net Carrying Amount of Convertible Notes (Details) - Convertible Debt - USD ($)
$ in Thousands
Mar. 31, 2020
Mar. 05, 2020
Dec. 31, 2019
May 25, 2018
Mar. 06, 2017
Debt Instrument [Line Items]          
Principal outstanding $ 2,048,751   $ 1,074,226    
Unamortized debt discount (269,845)   (129,830)    
Unamortized debt issuance costs (18,059)   (5,564)    
Net carrying value 1,760,847   938,832    
2025 Notes          
Debt Instrument [Line Items]          
Principal outstanding 1,000,000        
Unamortized debt discount (151,680)        
Unamortized debt issuance costs (13,190) $ (12,800)      
Net carrying value 835,130        
2023 Notes          
Debt Instrument [Line Items]          
Principal outstanding 862,500   862,500    
Unamortized debt discount (103,016)   (110,518)    
Unamortized debt issuance costs (3,186)   (3,418) $ (5,600)  
Net carrying value 756,298   748,564    
2022 Notes          
Debt Instrument [Line Items]          
Principal outstanding 186,251   211,726    
Unamortized debt discount (15,149)   (19,312)    
Unamortized debt issuance costs (1,683)   (2,146)   $ (9,400)
Net carrying value $ 169,419   $ 190,268