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LONG-TERM DEBT - Senior Secured Notes Narrative (Details) - Senior Secured Notes - USD ($) $ in Millions |  | 3 Months Ended |  |
--- | --- | --- | --- | ---
Feb. 12, 2021 | Mar. 31, 2021 | Feb. 02, 2021 | Feb. 02, 2018
Line of Credit Facility [Line Items] |  |  |  |
Percentage of prepayment Premium |  |  | 0.90% |
Senior Secured Notes Due 2028 |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Aggregate principal amount | $ 310 |  |  |
Interest rate | 8.25% |  |  |
Borrowed funds designated for contructing project | $ 180 |  |  |
Proceeds form the offering | $ 8 |  |  |
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed | 35.00% |  |  |
Percentage of redemption of equity offering | 108.25% |  |  |
Debt Instrument, Redemption Price, Percentage |  | 100.00% |  |
Senior Secured Notes Due 2024 |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Aggregate principal amount |  |  |  | $ 100

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