LONG-TERM DEBT - Components of Convertible Debt Interest Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Amortization of debt discount and issuance costs	$ 13,784	$ 8,829	$ 7,695
Total interest expense	46,308	29,818	$ 29,713
Convertible debt
Debt Instrument [Line Items]
Coupon interest	4,657	11,329
Amortization of debt discount and issuance costs	3,129	6,938
Total interest expense	$ 7,786	$ 18,267
Effective interest rate	9.12%	9.12%