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DEBT - Convertible Senior Notes due in 2025 Narrative (Details)
 2 Months Ended 3 Months Ended 9 Months Ended
Mar. 01, 2021
USD ($)
Mar. 09, 2020
USD ($)
trading_day
$ / shares
shares
May 19, 2020
trading_day
shares
Sep. 30, 2021
USD ($)
$ / shares
shares
Jun. 30, 2021
USD ($)
shares
Mar. 31, 2021
USD ($)
shares
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
$ / shares
shares
Sep. 30, 2020
USD ($)
May 19, 2021
$ / shares
Dec. 31, 2020
USD ($)
$ / shares
shares
May 20, 2020
USD ($)
$ / shares
shares
Debt Instrument [Line Items]                        
Debt, current       $ 86,039,000       $ 86,039,000     $ 325,967,000  
Common stock, par value (in usd per share) | $ / shares       $ 0.00001       $ 0.00001   $ 0.00001 $ 0.00001 $ 0.00001
Common stock, shares authorized (in shares) | shares     150,000,000 300,000,000       300,000,000     200,000,000 200,000,000
Deferred taxes       $ 133,158,000       $ 133,158,000     $ 92,904,000  
Partial repurchase of convertible notes               289,312,000 $ 0      
Loss on partial settlement of convertible notes       0     $ 0 56,382,000 0      
Payment for bonds hedge               286,235,000 89,056,000      
Proceeds from sale of warrants               220,800,000 $ 71,552,000      
Warrants obligations measured at fair value                       $ 96,400,000
Convertible Notes                        
Debt Instrument [Line Items]                        
Convertible notes embedded derivative                       117,100,000
Convertible Notes | Convertible Senior Notes Due 2025                        
Debt Instrument [Line Items]                        
Debt instrument face amount   $ 320,000,000                    
Interest rate   0.25%                    
Debt conversion price (in USD per share) | $ / shares   $ 81.54                    
Proceeds from convertible debt   $ 313,000,000                    
Conversion ratio   0.0122637                    
Number of consecutive trading days | trading_day     20                  
Debt, current       102,200,000       102,200,000        
Convertible notes embedded derivative   $ 68,700,000                   $ 116,300,000
Embedded derivative, host contract   251,300,000                    
Deferred taxes       $ 200,000       200,000        
Debt issuance costs   $ 7,600,000                    
Partial repurchase of convertible notes           $ 217,700,000            
Exercise of warrants (shares) | shares         485 1,670,000            
Equity component of convertible notes due 2025, net $ 302,700,000       $ 100,000              
Convertible note, liability component $ 184,500,000                      
Residual           $ 4,300,000            
Induced conversion of convertible debt expense               37,500,000        
Remaining expected life           4 years 1 month 6 days            
Write off of debt discount           $ 38,500,000            
Write off of deferred debt issuance cost           $ 4,100,000            
Loss on partial settlement of convertible notes               $ 9,400,000        
Conversion of debt         $ 100,000              
Effective percentage rate       5.18%       5.18%        
Unamortized discount       $ 15,600,000       $ 15,600,000     $ 58,600,000  
Remaining discount amortization period               3 years 4 months 24 days        
Conversion shares (in shares) | shares   3,900,000                    
Payment for bonds hedge   $ 89,100,000                    
Warrants issued, strike price (in USD per share) | $ / shares   $ 106.94                    
Proceeds from sale of warrants   $ 71,600,000                    
Convertible notes hedge settlements, shares received (in shares) | shares           1,900,000            
Warrants unwound, shares issued (in shares) | shares           1,800,000            
Convertible notes hedge transaction, options outstanding (in shares) | shares       1,300,000       1,300,000        
Warrants outstanding (in shares) | shares       1,300,000       1,300,000        
Convertible Notes | Convertible Senior Notes Due 2025 | Discount rate                        
Debt Instrument [Line Items]                        
Measurement input           0.0435            
Period One | Convertible Notes | Convertible Senior Notes Due 2025                        
Debt Instrument [Line Items]                        
Number of threshold trading days | trading_day   20                    
Number of consecutive trading days | trading_day   30                    
Threshold percentage   130.00%                    
Stock trigger price (in USD per share) | $ / shares               $ 106.00        
Period Two | Convertible Notes | Convertible Senior Notes Due 2025                        
Debt Instrument [Line Items]                        
Number of consecutive trading days | trading_day   5                    
Business day period after measurement period   5 days                    
Threshold percentage   100.00%                    
Measurement period percentage of stock price trigger   98.00%