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INDEBTEDNESS - Convertible Bond Hedge and Warrant Transactions (Details) - USD ($)
$ / shares in Units, $ in Thousands, shares in Millions
12 Months Ended
Mar. 06, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
May 25, 2018
Debt Instrument [Line Items]          
Proceeds from issuance of warrants   $ 0 $ 112,125 $ 57,244  
Convertible Debt | 2023 Notes          
Debt Instrument [Line Items]          
Conversion price of convertible debt (in USD per share)   $ 77.85     $ 77.85
Conversion price of convertible debt after effect of warrants and note hedge (in USD per share)   $ 109.26      
Convertible Debt | 2022 Notes          
Debt Instrument [Line Items]          
Conversion price of convertible debt (in USD per share) $ 22.95        
Conversion price of convertible debt after effect of warrants and note hedge (in USD per share) $ 31.18        
Common Stock Warrants          
Debt Instrument [Line Items]          
Warrants to purchase aggregate shares of capital stock (in shares) 19.2 11.1      
Warrants, weighted average exercise price (in USD per share) $ 31.18 $ 109.26      
Proceeds from issuance of warrants $ 57,200 $ 112,100      
Shares received upon exercise of convertible notes (in shares)     7.2    
Common Stock Warrants | 2022 Notes          
Debt Instrument [Line Items]          
Shares received upon exercise of convertible notes (in shares)   0.3 6.9    
Options          
Debt Instrument [Line Items]          
Warrants to purchase aggregate shares of capital stock (in shares)   11.1      
Convertible note hedge, option to purchase common stock, price (in USD per share) $ 22.95 $ 77.85      
Cost of convertible note hedge $ 92,100 $ 172,600