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COMMITMENTS AND CONTINGENCIES - (Narrative) (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020 | Dec. 31, 2019
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Other Commitments [Line Items] |  |  |
Asset retirement obligation | $ 13,671 | $ 13,038 | $ 18,972
Canyon Project |  |  |
Other Commitments [Line Items] |  |  |
Loss contingency, estimate of possible loss | 20,840 | 20,820 |
Asset retirement obligation | $ 42,290 | $ 41,950 |

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