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SUBSEQUENT EVENTS (Details) - USD ($)
 1 Months Ended 12 Months Ended
Jan. 31, 2016
Dec. 31, 2014
Dec. 31, 2013
Jan. 28, 2016
Dec. 31, 2015
SUBSEQUENT EVENTS          
Net proceeds received, after deducting discounts and commissions but before offering expenses   $ 115,009,000 $ 50,000,000    
Common shares issued   55,161,856     55,965,443
Credit facility          
SUBSEQUENT EVENTS          
Maximum borrowing capacity         $ 2,770,957,000
Subsequent event          
SUBSEQUENT EVENTS          
Offering of common shares (in shares) 500,000        
Net proceeds received, after deducting discounts and commissions but before offering expenses $ 13,600,000        
Subsequent event | Credit facility | International Finance Corporation ("IFC")          
SUBSEQUENT EVENTS          
Maximum borrowing capacity       $ 60,000,000  
Common shares issued       529,661  
Share price of common shares issued       $ 18.88  
Subsequent event | Convertible notes          
SUBSEQUENT EVENTS          
Convertible notes bought back $ 15,000,000        
Weighted average price (in dollars per share) $ 85.13        
Par value $ 100        
Subsequent event | 75 megawatt (MWac) Astoria 2 solar power project          
SUBSEQUENT EVENTS          
Project-level construction debt, a letter of credit facility and a back-leveraged term loan facility $ 180,000,000