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INVESTMENTS IN AFFILIATES - Tax equity transactions (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 31, 2020 | Dec. 31, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Tax equity transactions |  |  |  |  |
Gain on disposal of investment in affiliates |  |  | $ 13,936 | $ 1,928 | $ 47,102
Class B membership interests |  |  |  |  |
Tax equity transactions |  |  |  |  |
Net assets derecognized | $ 18,486 |  |  |  |
Value wrote down |  | $ 4,995 |  |  |
RE Roserock Holdings LLC ("Roserock") |  |  |  |  |
Tax equity transactions |  |  |  |  |
Ownership percentage |  |  |  | 49.00% |

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