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DEBT - Convertible Senior Notes due 2024 Narrative (Details)
$ / shares in Units, shares in Millions
 3 Months Ended
Mar. 01, 2021
trading_day
Jun. 05, 2019
USD ($)
trading_day
$ / shares
shares
Mar. 31, 2021
USD ($)
trading_day
$ / shares
shares
Mar. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Debt Instrument [Line Items]          
Debt, current     $ 84,356,000   $ 325,967,000
Deferred tax assets, net     132,231,000   92,904,000
Loss on partial repurchase of convertible notes     56,369,000 $ 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    
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    
Conversion of debt     87,100,000    
Convertible note, liability component   $ 95,600,000 78,400,000    
Convertible note, equity component   36,400,000 8,600,000    
Deferred tax assets, net   300,000      
Debt issuance costs   4,600,000      
Unamortized debt issuance costs   3,300,000 100,000   1,500,000
Debt issuance costs, allocated to capital   $ 1,300,000      
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 repurchase of convertible notes     $ 9,500,000    
Effective percentage rate     7.75%    
Unamortized discount     $ 200,000   $ 17,600,000
Remaining discount amortization period     3 years 2 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    
Warrants outstanding (in shares) | shares     0.1    
Convertible notes hedge transaction, options outstanding (in shares) | shares     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%