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SUBSEQUENT EVENT (Details) - USD ($) shares in Thousands, $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
SUBSEQUENT EVENTS |  |  |  |
Shares issued |  | 1,525,151 | 1,531,874 | 1,584,484
Golden Eagle Area Development |  |  |  |
SUBSEQUENT EVENTS |  |  |  |
Ownership interest (as percent) |  | 26.69% | 26.69% |
Other disposals of assets | Golden Eagle Area Development | Forecast |  |  |  |
SUBSEQUENT EVENTS |  |  |  |
Ownership interest (as percent) | 26.69% |  |  |
Proceeds from sale of joint venture | $ 325 |  |  |
Other disposals of assets | Golden Eagle Area Development | Forecast | Maximum |  |  |  |
SUBSEQUENT EVENTS |  |  |  |
Contingent consideration | $ 50 |  |  |

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