COMMITMENTS AND CONTINGENCIES - Estimated Purchase Commitment (Details) $ in Thousands	Dec. 31, 2020 USD ($)
Estimated purchase commitment
2021	$ 101,200
2022	202,400
2023	202,400
Total	$ 506,000

Amount of purchase arrangement to be paid in next fiscal year following current fiscal year. Includes, but is not limited to, recorded and unrecorded purchase obligations, long-term purchase commitment, and short-term purchase commitment. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

No definition available.

Name:	us-gaap_PurchaseObligationDueInNextTwelveMonths
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant