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FAIR VALUE MEASUREMENT (Details 4) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Carrying value $ 4,417,254 $ 3,072,424  
Impairment charges for property, plant and equipment 6,992 1,573 $ 3,665
Carrying value of long-term borrowings 606,577 134,300  
Fair value of long-term debt 606,577 134,300  
Carrying value of convertible notes 150,000 150,000  
Mono-crystalline ingot furnaces      
Carrying value     5,800
Assets fair value     2,100
Mono-crystalline ingot furnaces | General and administrative expenses      
Impairment charges for property, plant and equipment     $ 3,700
Idle assets      
Impairment charges for property, plant and equipment $ 7,000 $ 1,600