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INVESTMENTS IN AFFILIATES - Tax equity transactions (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Tax equity transactions |  |  |
Gain on disposal of investment in affiliates | $ 10,392 | $ 13,936 | $ 1,928
RE Roserock Holdings LLC ("Roserock") |  |  |
Tax equity transactions |  |  |
Ownership percentage | 20.00% |  |

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