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COMMITMENTS AND CONTINGENCIES - (Narrative) (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
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Other Commitments [Line Items] |  |  |
Asset retirement obligation | $ 14,177 | $ 13,687 | $ 13,038
Canyon Project |  |  |
Other Commitments [Line Items] |  |  |
Loss contingency, estimate of possible loss | 20,320 | 20,310 |
Asset retirement obligation | $ 42,750 | $ 41,340 |

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