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EARNINGS PER SHARE (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Computation of basic and diluted gain (loss) per share      
Net income attributable to Canadian Solar Inc. - basic $ 146,703 $ 171,585 $ 237,070
Dilutive effect of interest expense of convertible notes 1,518 975 4,683
Net income attributable to Canadian Solar Inc. - diluted $ 148,221 $ 172,560 $ 241,753
Denominator for basic calculation - weighted average number of common shares - basic 59,575,898 59,633,855 58,914,540
Diluted effects of share number from share options and RSUs 897,258 794,526 543,797
Dilutive effects of share number from convertible notes 1,833,663 349,315 2,833,333
Denominator for diluted calculation - weighted average number of common shares - diluted 62,306,819 60,777,696 62,291,670
Basic earnings per share $ 2.46 $ 2.88 $ 4.02
Diluted earnings per share $ 2.38 $ 2.83 $ 3.88
Share options and RSUs      
Computation of basic and diluted gain (loss) per share      
Anti-dilutive shares excluded from the computation of diluted earnings per share, total 187,083 41,950 276,618