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PROJECT ASSETS (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
PROJECT ASSETS      
Project assets - Acquisition cost $ 40,094 $ 38,298  
Project assets - EPC and other cost 1,631,418 1,461,995  
Total project assets 1,671,512 1,500,293  
Current portion 1,523,342 1,317,902  
Non-current portion 148,170 182,391  
Impairment charges and write-off $ 0 $ 2,952 $ 0