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INCOME TAXES - Domestic federal statutory tax rates (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 USD ($) item | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Income taxes: |  |  |
Federal and provincial income tax rate (as a percent) | 27.00% | 27.00% | 27.00%
Amount of interest and penalties accrued related to unrecognized tax benefits | $ 956 | $ 961 |
Effective Income Tax Rate Reconciliation at Federal and Provincial Income Tax Rate | 27.00% | 27.00% | 27.00%
Changes to the company's liabilities for uncertain tax positions |  |  |
Beginning balance | $ 4,770 | $ 5,863 | $ 9,628
Reductions for tax positions from prior years/Statute of limitations expirations | (24) |  | (3,763)
Statue of limitations expirations |  | (678) |
Foreign exchange effect | (1) | (415) | (2)
Ending balance | $ 4,745 | $ 4,770 | $ 5,863
Canada |  |  |
Income taxes: |  |  |
Federal and provincial income tax rate (as a percent) | 26.50% |  |
Effective Income Tax Rate Reconciliation at Federal and Provincial Income Tax Rate | 26.50% |  |
United States | Canadian Solar Solutions Inc. |  |  |
Income taxes: |  |  |
Income tax rate (as a percent) | 28.10% |  |
United States | Canadian Solar (USA) Inc. |  |  |
Income taxes: |  |  |
Income tax rate (as a percent) | 25.50% | 24.60% | 26.40%
United States | Canadian Solar SSES (US) Inc |  |  |
Income taxes: |  |  |
Income tax rate (as a percent) |  | 21.90% |
United States | Recurrent Energy Group Inc. |  |  |
Income taxes: |  |  |
Income tax rate (as a percent) | 26.10% | 22.50% | 22.20%
Japan | Canadian Solar Japan K.K. |  |  |
Income taxes: |  |  |
Income tax rate (as a percent) | 31.80% | 31.80% | 31.80%
Germany | Canadian Solar EMEA GmbH |  |  |
Income taxes: |  |  |
Income tax rate (as a percent) | 33.00% | 33.00% | 33.00%
Thailand | Canadian Solar Manufacturing (Thailand) Co., Ltd. |  |  |
Income taxes: |  |  |
Income tax rate (as a percent) | 20.00% |  |
Number of Board of Investment certificates for tax exemption | item | 5 |  |
Hong Kong | HKSI |  |  |
Income taxes: |  |  |
Income tax rate (as a percent) | 16.50% | 16.50% | 16.50%
Brazil | Canadian Solar Brazil Commerce, Import and Export of Solar Panels Ltd. |  |  |
Income taxes: |  |  |
Income tax rate (as a percent) | 34.00% | 34.00% | 34.00%

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