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DEBT - Convertible Senior Notes due 2024 (Details)
$ / shares in Units, shares in Millions
12 Months Ended
Jun. 05, 2019
USD ($)
trading_day
$ / shares
shares
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Debt Instrument [Line Items]        
Deferred tax assets, net   $ 74,531,000 $ 0  
Payment for bonds hedge   36,313,000 0 $ 0
Proceeds from sale of warrants $ 29,800,000 $ 29,818,000 $ 0 $ 0
Convertible Notes | Convertible Senior Note Due 2024        
Debt Instrument [Line Items]        
Debt instrument face amount $ 132,000,000.0      
Interest rate 1.00%      
Debt conversion price (in USD per share) | $ / shares $ 20.5010      
Proceeds from convertible debt $ 128,000,000.0      
Convertible note, liability component $ 95,600,000      
Effective percentage rate 7.75% 7.75%    
Convertible note, equity component $ 36,400,000      
Deferred tax assets, net   $ 300,000    
Debt issuance costs 4,600,000      
Unamortized debt issuance costs 3,300,000 2,900,000    
Debt issuance costs, allocated to capital $ 1,300,000      
Unamortized discount   $ 32,900,000    
Remaining discount amortization period   4 years 4 months 24 days    
Warrants sold (in shares) | shares 6.4      
Warrants issued, strike price (in USD per share) | $ / shares $ 25.2320      
Conversion ratio 0.0487781      
Conversion shares (in shares) | shares 6.4      
Period One | Convertible Notes | Convertible Senior Note Due 2024        
Debt Instrument [Line Items]        
Number of threshold trading days | trading_day 20      
Number of consecutive trading days | trading_day 30      
Stock trigger price (in USD per share) | $ / shares $ 26.6513      
Threshold percentage 130.00%      
Measurement period percentage of stock price trigger 98.00%      
Period Two | Convertible Notes | Convertible Senior Note Due 2024        
Debt Instrument [Line Items]        
Threshold percentage 100.00%      
Convertible Notes | Level 2        
Debt Instrument [Line Items]        
Obligations measured at fair value   $ 190,900,000