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DEBT - Convertible Senior Notes due 2024 Narrative (Details)
$ / shares in Units, shares in Millions
 3 Months Ended 6 Months Ended
Mar. 01, 2021
trading_day
Jun. 05, 2019
USD ($)
trading_day
$ / shares
shares
Jun. 30, 2021
USD ($)
shares
Mar. 31, 2021
USD ($)
shares
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
trading_day
$ / shares
shares
Jun. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Debt Instrument [Line Items]                
Debt, current     $ 85,125,000     $ 85,125,000   $ 325,967,000
Deferred taxes     130,571,000     130,571,000   92,904,000
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  
Convertible Notes | Convertible Senior Notes Due 2024                
Debt Instrument [Line Items]                
Debt instrument face amount   $ 132,000,000.0 1,100,000     1,100,000    
Interest rate   1.00%            
Debt conversion price (in USD per share) | $ / shares   $ 20.50            
Proceeds from convertible debt   $ 128,000,000.0            
Conversion ratio   0.0487781            
Debt, current     900,000     900,000    
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 10 months 24 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 | 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