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ACQUISITIONS - Acquisition of Non-controlling Interest (Details) - USD ($) | Sep. 18, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Jun. 27, 2019
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Disclosure of detailed information about business combination [line items] |  |  |  |
Consideration transferred, acquisition-date fair value |  |  |  | $ 13,000,000.0
Cash transferred |  |  |  | $ 22,000,000.0
Non-controlling interest |  | $ 513,626,000 | $ 0 |
Puna |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |
Percentage of remaining voting equity interests acquired | 25.00% |  |  |
Consideration transferred, acquisition-date fair value | $ 32,400,000 |  |  |
Cash transferred | 2,300,000 |  |  |
Consideration transferred, cancellation of debt and related interests | 11,400,000 |  |  |
Equity interests of acquirer | 18,200,000 |  |  |
Consideration transferred, transfer of shares for cancellation, fair value | 500,000 |  |  |
Non-controlling interest | 33,900,000 |  |  |
Transaction and integration expense | 200,000 |  |  |
Puna Operations Inc. |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |
Non-controlling interests difference in carrying value and fair value | $ 1,600,000 |  |  |

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