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PROJECT ASSETS (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
PROJECT ASSETS      
Project assets - Acquisition cost $ 38,298 $ 2,220  
Project assets - EPC and other cost 1,461,995 111,911  
Total project assets 1,500,293 114,131  
Current portion 1,317,902 111,317  
Non-current portion 182,391 2,814  
Impairment charges and write-off $ 2,952 $ 0 $ 2,311