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EARNINGS PER SHARE (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Computation of basic and diluted gain (loss) per share      
Net income attributable to Canadian Solar Inc. - basic (in dollars) $ 171,585 $ 237,070 $ 99,572
Dilutive effect of interest expense of convertible notes 975 4,683 4,649
Net income attributable to Canadian Solar Inc. - diluted $ 172,560 $ 241,753 $ 104,221
Denominator for basic calculation - weighted average number of common shares - basic 59,633,855 58,914,540 58,167,004
Diluted effects of share number from share options and RSUs 794,526 543,797 547,821
Dilutive effects of share number from convertible notes 349,315 2,833,333 2,833,333
Denominator for diluted calculation - weighted average number of common shares - diluted 60,777,696 62,291,670 61,548,158
Basic earnings per share (in dollars per share) $ 2.88 $ 4.02 $ 1.71
Diluted earnings per share (in dollars per share) $ 2.83 $ 3.88 $ 1.69
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 41,950 276,618 372,743