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PROJECT ASSETS (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
PROJECT ASSETS      
Project assets - Acquisition cost $ 2,220 $ 119,060  
Project assets - EPC and other cost 111,911 185,451  
Total project assets 114,131 304,511  
Current portion 111,317 235,228  
Non-current portion 2,814 69,283  
Impairment charges $ 0 $ 2,311 $ 1,558