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INDEBTEDNESS - Interest Expense on Convertible Notes (Details) - Convertible Debt - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Debt Instrument [Line Items]        
Contractual interest expense $ 17,047 $ 1,544 $ 27,272 $ 4,482
Amortization of debt issuance costs 2,868 17,516 7,005 47,624
Total $ 19,915 $ 19,060 $ 34,277 $ 52,106