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INVESTMENTS IN AFFILIATES - Other investments (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Other investments |  |  |  |  |
Cash consideration for acquisition of the entity |  |  | $ 17,758 | $ 7,684 | $ 11,036
Equity in earnings (loss) of unconsolidated investees |  |  | 10,779 | 28,948 | 5,908
Impairment loss of investment |  |  | $ 24,060 | $ 0 | $ 5,738
Gain or loss on sale of equity investments | $ 13,140 |  |  |  |
Suzhou Financial Leasing Co., Ltd. |  |  |  |  |
Other investments |  |  |  |  |
Ownership percentage | 6.00% |  | 6.00% | 6.00% |
Canadian Solar Infrastructure Fund, Inc |  |  |  |  |
Other investments |  |  |  |  |
Ownership percentage | 14.66% |  | 14.66% | 14.66% |
Now, Inc. |  |  |  |  |
Other investments |  |  |  |  |
Ownership percentage |  | 10.00% |  |  |
Impairment loss of investment |  | $ 700 |  |  |

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