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DEBT - Schedule of Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Debt Disclosure [Abstract]
Contractual interest expense	$ 1,704	$ 1,764	$ 5,122	$ 5,861
Amortization of debt issuance costs	666	629	1,976	1,512
Amortization of debt discount	5,844	5,430	17,245	12,684
Capitalized interest and other (Note 5)	(881)	(691)	(3,016)	(1,448)
Total	$ 7,333	$ 7,132	$ 21,327	$ 18,609
Effective interest rate on convertible senior notes	6.70%	6.78%	6.70%	7.35%

X

- Definition

Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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Amount of amortization expense attributable to debt issuance costs.

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The average effective interest rate during the reporting period.

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Amount of interest capitalized during the period.

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Amount of the cost of borrowed funds accounted for as interest expense for debt.

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