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EARNINGS PER SHARE (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Anti-dilutive shares excluded from the computation of diluted earnings per share      
Net income attributable to Canadian Solar Inc. - basic $ 239,968 $ 95,248 $ 146,703
Dilutive effect of convertible notes 5,183 5,300 1,518
Net income attributable to Canadian Solar Inc. - diluted $ 245,151 $ 100,548 $ 148,221
Denominator for basic calculation - weighted average number of common shares - basic 64,324,558 61,614,391 59,575,898
Diluted effects of share number from share options and RSUs 586,420 985,554 897,258
Dilutive effects of share number from convertible notes 6,272,157 6,272,157 1,833,663
Denominator for diluted calculation - weighted average number of common shares - diluted 71,183,135 68,872,102 62,306,819
Basic earnings per share $ 3.73 $ 1.55 $ 2.46
Diluted earnings per share $ 3.44 $ 1.46 $ 2.38
Share options and RSUs      
Anti-dilutive shares excluded from the computation of diluted earnings per share      
Anti-dilutive shares excluded from the computation of diluted earnings per share, total 9,295 3,877 187,083