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EARNINGS PER SHARE (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Computation of basic and diluted gain (loss) per share      
Net income (loss) attributable to Canadian Solar Inc.-basic (in dollars) $ 171,861 $ 239,502 $ 31,659
Dilutive effect of interest expense of convertible notes 5,275 4,641  
Net income attributable to Canadian Solar Inc. - diluted $ 177,136 $ 244,143 $ 31,659
Weighted average number of common shares-basic 55,728,903 54,408,037 46,306,739
Diluted effects of share number from share options and RSUs 1,343,162 2,051,601 4,081,545
Diluted effects of share number from warrants 20,658    
Dilutive effects of share number from convertible notes 3,333,333 2,894,977  
Weighted average number of common shares - diluted 60,426,056 59,354,615 50,388,284
Basic earnings (loss) per share (in dollars per share) $ 3.08 $ 4.40 $ 0.68
Diluted earnings (loss) per share (in dollars per share) $ 2.93 $ 4.11 $ 0.63
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 (loss) per share, total 115,017,000 95,422,000 434,529,000