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INDEBTEDNESS - Convertible Senior Notes Narrative (Details)
$ / shares in Units, shares in Millions
3 Months Ended 27 Months Ended
Mar. 05, 2020
USD ($)
day
$ / shares
May 25, 2018
USD ($)
day
$ / shares
Mar. 06, 2017
USD ($)
day
$ / shares
Mar. 31, 2020
USD ($)
shares
Mar. 31, 2019
USD ($)
Mar. 31, 2020
USD ($)
shares
Dec. 31, 2019
USD ($)
Debt Instrument [Line Items]              
Loss on extinguishment of long-term debt       $ 990,000 $ 0    
Convertible Debt              
Debt Instrument [Line Items]              
Conversion price (in USD per share) | $ / shares $ 121.01 $ 77.85 $ 22.95        
Carrying amount of equity component       341,793,000   $ 341,793,000 $ 194,392,000
Issuance costs attributable to the liability component       18,059,000   18,059,000 5,564,000
Convertible Debt | 2025 Notes              
Debt Instrument [Line Items]              
Aggregate principal amount $ 1,000,000,000.0            
Interest rate 0.125%            
Conversion rate 0.0082641            
Conversion price (in USD per share) | $ / shares $ 121.01            
Redemption price, percentage 100.00%            
Carrying amount of equity component $ 154,600,000     $ 152,258,000   $ 152,258,000  
Effective interest rate of the liability component 3.81%     3.81%   3.81%  
Discounts and commissions payable $ 14,300,000            
Third party offering costs 900,000            
Issuance costs attributable to the liability component $ 12,800,000     $ 13,190,000   $ 13,190,000  
Amount of if-converted value in excess of outstanding principal amount       0      
Convertible Debt | 2025 Notes | Debt Instrument, Conversion Term One              
Debt Instrument [Line Items]              
Threshold trading days | day 20            
Threshold consecutive trading days | day 30            
Threshold percentage of stock price trigger 130.00%            
Convertible Debt | 2025 Notes | Debt Instrument Conversion Term Two              
Debt Instrument [Line Items]              
Threshold trading days | day 5            
Threshold consecutive trading days | day 5            
Threshold percentage of stock price trigger 98.00%            
Convertible Debt | 2023 Notes              
Debt Instrument [Line Items]              
Aggregate principal amount   $ 862,500,000          
Interest rate   0.50%          
Conversion rate   0.0128456          
Conversion price (in USD per share) | $ / shares   $ 77.85          
Carrying amount of equity component   $ 155,300,000   $ 154,019,000   $ 154,019,000 154,019,000
Effective interest rate of the liability component   4.69%   4.69%   4.69%  
Discounts and commissions payable   $ 6,000,000.0          
Third party offering costs   800,000          
Issuance costs attributable to the liability component   $ 5,600,000   $ 3,186,000   $ 3,186,000 3,418,000
Amount of if-converted value in excess of outstanding principal amount       0      
Convertible Debt | 2023 Notes | Debt Instrument, Conversion Term One              
Debt Instrument [Line Items]              
Threshold trading days | day   20          
Threshold consecutive trading days | day   30          
Threshold percentage of stock price trigger   130.00%          
Convertible Debt | 2023 Notes | Debt Instrument Conversion Term Two              
Debt Instrument [Line Items]              
Threshold trading days | day   5          
Threshold consecutive trading days | day   5          
Threshold percentage of stock price trigger   98.00%          
Convertible Debt | 2022 Notes              
Debt Instrument [Line Items]              
Aggregate principal amount     $ 440,000,000.0        
Interest rate     0.375%        
Conversion rate     0.0435749        
Conversion price (in USD per share) | $ / shares     $ 22.95        
Carrying amount of equity component     $ 86,200,000 $ 35,516,000   $ 35,516,000 40,373,000
Effective interest rate of the liability component     5.34% 5.34%   5.34%  
Discounts and commissions payable     $ 11,000,000.0        
Third party offering costs     800,000        
Issuance costs attributable to the liability component     $ 9,400,000 $ 1,683,000   $ 1,683,000 $ 2,146,000
Notes converted       $ 25,500,000   253,700,000  
Principal payment on conversion of senior notes           $ 219,400,000  
Shares issued upon conversion (in shares) | shares       1.1   8.4  
Loss on extinguishment of long-term debt       $ 1,000,000.0   $ 6,000,000.0  
Amount of if-converted value in excess of outstanding principal amount       $ 238,900,000      
Convertible Debt | 2022 Notes | Debt Instrument, Conversion Term One              
Debt Instrument [Line Items]              
Threshold trading days | day     20        
Threshold consecutive trading days | day     30        
Threshold percentage of stock price trigger     130.00%        
Convertible Debt | 2022 Notes | Debt Instrument Conversion Term Two              
Debt Instrument [Line Items]              
Threshold trading days | day     5        
Threshold consecutive trading days | day     5        
Threshold percentage of stock price trigger     98.00%