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DEBT - Convertible Senior Notes due in 2025 Narrative (Details)
 3 Months Ended 6 Months Ended
Mar. 01, 2021
USD ($)
Mar. 09, 2020
USD ($)
trading_day
$ / shares
shares
Jun. 30, 2021
USD ($)
$ / shares
shares
Mar. 31, 2021
USD ($)
shares
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
$ / shares
shares
Jun. 30, 2020
USD ($)
May 19, 2021
$ / shares
shares
May 18, 2021
shares
Dec. 31, 2020
USD ($)
$ / shares
shares
May 20, 2020
USD ($)
$ / shares
shares
May 19, 2020
shares
Debt Instrument [Line Items]                        
Debt, current     $ 85,125,000     $ 85,125,000       $ 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     300,000,000     300,000,000   300,000,000 200,000,000 200,000,000 200,000,000 150,000,000
Deferred taxes     $ 130,571,000     $ 130,571,000       $ 92,904,000    
Partial repurchase of convertible notes           289,312,000 $ 0          
Loss on partial settlement of convertible notes     13,000   $ 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   $ 320,000,000.0                    
Interest rate   0.25%                    
Debt conversion price (in USD per share) | $ / shares   $ 81.54                    
Proceeds from convertible debt   $ 313,000,000.0                    
Conversion ratio   0.0122637                    
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     $ 16,700,000     $ 16,700,000       $ 58,600,000    
Remaining discount amortization period           3 years 8 months 12 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%