DEBT - Capped Call Transactions (Details) $ in Thousands, shares in Millions	1 Months Ended	3 Months Ended	9 Months Ended
Feb. 29, 2020 $ / derivative shares	Sep. 30, 2021 USD ($) $ / derivative shares	Sep. 30, 2020 USD ($) $ / derivative shares	Sep. 30, 2021 USD ($) $ / derivative shares	Sep. 30, 2020 USD ($) $ / derivative shares
Debt Disclosure [Abstract]
Number of shares issuable upon conversion \| shares	4.4	4.4	4.4	4.4	4.4
Cap price (in dollars per share) \| $ / derivative	196.44	196.44	196.44	196.44	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				(7,543)	19,816
Ending balance		$ 76,054	$ 71,716	$ 76,054	$ 71,716

The number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or payments in the period.

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The cap rate on a price risk derivative such as a cap or collar. A payment or receipt is triggered if the market rate exceeds the cap rate on the contract.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of gain (loss) recognized in income from liability measured at fair value on recurring basis using unobservable input (level 3).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
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- Definition

Amount of issuances of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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