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PROJECT ASSETS (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
PROJECT ASSETS      
Project assets - Acquisition cost $ 44,549 $ 55,158  
Project assets - EPC and other cost 1,092,917 1,031,976  
Total project assets 1,137,466 1,087,134  
Current portion 747,764 604,083  
Non-current portion 389,702 483,051  
Impairment loss of project assets $ 369 $ 20,194 $ 9,016