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INDEBTEDNESS - Convertible Senior Notes, Narrative (Details)
$ / shares in Units, shares in Millions
12 Months Ended
May 25, 2018
USD ($)
day
$ / shares
Mar. 06, 2017
USD ($)
day
$ / shares
Dec. 31, 2019
USD ($)
$ / shares
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2017
USD ($)
Debt Instrument [Line Items]          
Principal payment on conversion of senior notes     $ 0 $ 219,384,000 $ 0
Loss on extinguishment of long-term debt     0 5,047,000 $ 0
Convertible Debt          
Debt Instrument [Line Items]          
Carrying amount of equity component     194,392,000 194,392,000  
Issuance costs attributable to the liability component     $ 5,564,000 8,040,000  
2023 Notes | Convertible Debt          
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   $ 77.85    
Carrying amount of equity component $ 155,300,000   $ 154,019,000 154,019,000  
Effective interest rate of the liability component 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   $ 3,418,000 5,054,000  
2023 Notes | Debt Instrument, Conversion Term One | Convertible Debt          
Debt Instrument [Line Items]          
Threshold trading days | day 20        
Threshold consecutive trading days | day 30        
Threshold percentage of stock price trigger 130.00%        
2023 Notes | Debt Instrument, Conversion Term Two | Convertible Debt          
Debt Instrument [Line Items]          
Threshold trading days | day 5        
Threshold consecutive trading days | day 5        
Threshold percentage of stock price trigger 98.00%        
2022 Notes | Convertible Debt          
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      
Converted principal amount       $ 228,300,000  
Principal payment on conversion of senior notes     219,400,000    
Shares issued in connection with conversion (in shares) | shares       7.3  
Carrying amount of equity component   $ 86,200,000 $ 40,373,000 $ 40,373,000  
Effective interest rate of the liability component   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 $ 2,146,000 2,986,000  
Loss on extinguishment of long-term debt       5,000,000.0  
Reduction to additional paid-in-capital       $ 21,000,000.0  
2022 Notes | Debt Instrument, Conversion Term One | Convertible Debt          
Debt Instrument [Line Items]          
Threshold trading days | day   20      
Threshold consecutive trading days | day   30      
Threshold percentage of stock price trigger   130.00%      
2022 Notes | Debt Instrument, Conversion Term Two | Convertible Debt          
Debt Instrument [Line Items]          
Threshold trading days | day   5      
Threshold consecutive trading days | day   5      
Threshold percentage of stock price trigger   98.00%