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DEBT - Capped Call Transactions (Details)
$ in Thousands, shares in Millions
1 Months Ended 3 Months Ended
Feb. 29, 2020
$ / derivative
shares
Mar. 31, 2021
USD ($)
Mar. 31, 2020
USD ($)
Debt Disclosure [Abstract]      
Number of shares issuable upon conversion | shares 4.4    
Cap price (in dollars per share) | $ / derivative 196.44    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning balance   $ 83,597 $ 0
Issuance   0 51,900
Fair value adjustment   (19,117) (18,592)
Ending balance   $ 64,480 $ 33,308