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DEBT - Convertible Senior Notes due 2024 Narrative (Details)
$ / shares in Units, shares in Millions
 3 Months Ended 9 Months Ended
Mar. 01, 2021
trading_day
Jun. 05, 2019
USD ($)
trading_day
$ / shares
shares
Sep. 30, 2021
USD ($)
shares
Mar. 31, 2021
USD ($)
shares
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
trading_day
$ / shares
shares
Sep. 30, 2020
USD ($)
Oct. 12, 2021
USD ($)
Dec. 31, 2020
USD ($)
Debt Instrument [Line Items]                  
Debt, current     $ 86,039,000     $ 86,039,000     $ 325,967,000
Principal amount outstanding     1,026,283,000     1,026,283,000     330,865,000
Deferred taxes     133,158,000     133,158,000     92,904,000
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    
Convertible Notes | Convertible Senior Notes Due 2024                  
Debt Instrument [Line Items]                  
Debt instrument face amount   $ 132,000,000 1,100,000     1,100,000      
Interest rate   1.00%              
Debt conversion price (in USD per share) | $ / shares   $ 20.50              
Proceeds from convertible debt   $ 128,000,000              
Conversion ratio   0.0487781              
Debt, current     900,000     900,000      
Principal amount outstanding     883,000     883,000     69,021,000
Convertible note, liability component   $ 95,600,000   $ 78,400,000          
Convertible note, equity component   36,400,000   8,600,000          
Deferred taxes   300,000              
Debt issuance costs   4,600,000              
Unamortized debt issuance costs   3,300,000 $ 100,000     $ 100,000     1,500,000
Debt issuance costs, allocated to capital   $ 1,300,000              
Conversion of debt       87,100,000          
Repurchase amount       $ 25,500,000          
Exercise of warrants (shares) | shares       3.8          
Equity component of convertible notes due 2025, net       $ 659,400,000          
Remaining expected life       3 years 3 months 18 days          
Write off of debt discount       $ 16,700,000          
Write off of deferred debt issuance cost       1,400,000          
Loss on partial settlement of convertible notes       $ 9,500,000          
Effective percentage rate     7.75%     7.75%      
Unamortized discount     $ 200,000     $ 200,000     $ 17,600,000
Remaining discount amortization period           2 years 8 months 12 days      
Conversion shares (in shares) | shares   6.4              
Payment for bonds hedge   $ 36,300,000              
Warrants sold (in shares) | shares   6.4              
Warrants issued, strike price (in USD per share) | $ / shares   $ 25.23              
Proceeds from sale of warrants   $ 29,800,000              
Convertible notes hedge transaction, shares received (in shares) | shares       1.1          
Convertible notes hedge settlements, shares received (in shares) | shares       2.7          
Debt converted       $ 61,500,000          
Warrants unwound, shares issued (in shares) | shares       3.8          
Convertible notes hedge transaction, options outstanding (in shares) | shares     0.1     0.1      
Warrants outstanding (in shares) | shares     0.1     0.1      
Convertible Notes | Convertible Senior Notes Due 2024 | Subsequent Event                  
Debt Instrument [Line Items]                  
Principal amount outstanding               $ 1,100,000  
Convertible Notes | Convertible Senior Notes Due 2024 | Discount rate                  
Debt Instrument [Line Items]                  
Measurement input   0.0775   0.0425          
Period One | Convertible Notes | Convertible Senior Notes Due 2024                  
Debt Instrument [Line Items]                  
Number of threshold trading days | trading_day   20       20      
Number of consecutive trading days | trading_day           30      
Stock trigger price (in USD per share) | $ / shares           $ 26.65      
Threshold percentage           130.00%      
Measurement period percentage of stock price trigger   98.00%              
Period Two | Convertible Notes | Convertible Senior Notes Due 2024                  
Debt Instrument [Line Items]                  
Number of consecutive trading days | trading_day 5                
Threshold percentage   100.00%              
Business day period after measurement period   5 days