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DEBT - Schedule of Debt (Details) - Unsecured Debt - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Jul. 31, 2020
Mar. 31, 2017
Convertible Senior Notes Due 2025        
Debt Instrument [Line Items]        
Stated interest rate (as a percent) 0.75%   0.75%  
Convertible senior notes $ 402,500 $ 402,500    
Deferred financing costs (7,610) (8,940)    
Discount on debt (68,744) (80,530)    
Total debt, net of debt discount and deferred financing costs $ 326,146 313,030    
Convertible Senior Notes Due 2022        
Debt Instrument [Line Items]        
Stated interest rate (as a percent) 2.375%   2.375% 2.375%
Convertible senior notes $ 160,000 160,000    
Deferred financing costs (443) (1,089)    
Discount on debt (3,806) (9,263)    
Total debt, net of debt discount and deferred financing costs $ 155,751 $ 149,648